Answers and Analysis
This knowledge base, updated to include the analyses from the 2003 through the most recent editions of the Uniform Plumbing and Mechanical Codes, continues to be a premier source for engineers, inspectors, students, contractors and tradesmen. Questions come from a broad base of users, and answers are informal interpretations of the Codes provided by a committee of code officials and special experts - they are clearly stated and to the point. This updated site combines the most pertinent analyses from the previous manual and presents them together with those based on the most recent publications of the Uniform Codes. This makes the Answers and Analysis database one of the most valuable tools you as a member can access wherever you have an internet connection.
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Questions matching UPC Chapter 3
55 results
UPC 2003 301.1.1
UPC 2006 301.1.1
UPC 2009 301.1.1
UPC 2012 301.1.1
Topic: Nail Plates
Are nail plates required by code to be listed or labeled by a listing agency as stated in Sections 301.1.1, 313.9 and 1211.3.4, 312.9 and 1210.3.3 (2012) ?
No. Nail plates are not considered as part of the plumbing system, consequently, they do not have listing/labeling requirements. The Code does, however, stipulate a minimum thickness of 18 gauge steel,
which may be verified by using a caliper, micrometer or other similar measuring instrument. Certain CSST
manufacturers require that their own listed/labeled, case-hardened plates must be used in conjunction with their products.
which may be verified by using a caliper, micrometer or other similar measuring instrument. Certain CSST
manufacturers require that their own listed/labeled, case-hardened plates must be used in conjunction with their products.
UPC 2003 301.1.2
UPC 2006 301.1.2
UPC 2009 301.1.2
UPC 2012 301.1.1
Topic: Marking Requirements
Chapter 6 requires that all water tubing be marked to identify its intended use. NSF has specific marking requirements to specify the end use application: potable water (pw), radiant floor heating (rfh), drain waste
and vent (dwv), as well as, others. Does marking the tubing NSF-pw for potable water and NSF-rfh for
radiant floor heating meet the intent of the UPC to clearly identify the tubing as potable or non-potable?
and vent (dwv), as well as, others. Does marking the tubing NSF-pw for potable water and NSF-rfh for
radiant floor heating meet the intent of the UPC to clearly identify the tubing as potable or non-potable?
There are two (2) separate and distinct marking requirements for pipe or tubing conveying potable/nonpotable water. 1. Marking required by the applicable standard regulating the material. This marking shall be factory
applied as required by Section 301.1.2 (2003/2006/2009), 301.1.1 (2012) 2. Marking required by Section 601.2 (2003/2006/2009/2012) and Table 6-1 (2003/2006/2009) Table 601.2.2 (2012), which is applied in the field to identify the system as "potable" or "non-potable."
applied as required by Section 301.1.2 (2003/2006/2009), 301.1.1 (2012) 2. Marking required by Section 601.2 (2003/2006/2009/2012) and Table 6-1 (2003/2006/2009) Table 601.2.2 (2012), which is applied in the field to identify the system as "potable" or "non-potable."
UPC 2003 301.1.4
UPC 2006 301.1.4
UPC 2009 301.1.4
UPC 2012 301.1.3
Topic: Existing Installations
When are “existing, non-compliant” materials, equipment, or plumbing systems required to be replaced with currently compliant products or installation requirements?
Existing systems may remain in service, when maintained in accordance with the law in effect prior to the effective date of this Code, provided that no hazard to life, health, or property exists, or would be created
by such ongoing utilization. If an existing system is replaced or additions are made to the system the new
work and materials shall meet the current code requirements.
by such ongoing utilization. If an existing system is replaced or additions are made to the system the new
work and materials shall meet the current code requirements.
UPC 2003 301.2
UPC 2006 301.2
UPC 2009 301.2
UPC 2012 301.2
Topic: Alternate Materials and Methods of Construction
Is there any exception for custom made or one-of-a-kind fixtures (non-listed or unapproved fixtures) to deviate from the approved applicable standards referenced in these codes and one-time approval to be
granted by authorities having jurisdiction, knowing that this fixture is going to be used in different locations
and jurisdictions over and over again?
granted by authorities having jurisdiction, knowing that this fixture is going to be used in different locations
and jurisdictions over and over again?
It is not intended by Section 301.2 that all fixtures be arbitrarily approved for installation on an unlimited basis. It is intended that the allowance be made on a one-time basis and only in that jurisdiction. However, this does not exclude those particular fixtures from meeting the requirements of the approved standards. If a jurisdiction or municipality allows the arbitrary installation of such fixtures, which are required to be equivalent to or superior to the required standards, then they incur all liability associated with such installation and use. The UPC Code has no control over the decisions made by the Authority Having Jurisdiction.
UPC 2003 301.2
UPC 2006 301.2
UPC 2009 301.2
UPC 2012 301.2
Topic: Alternate Materials and Methods
What guidelines, if any, limit the discretionary powers granted by UPC Section 301.2.2?
Section 301.2 grants authority to code administrators to approve materials or products at their discretion. However, Section 301.2.2 places an obligation on the administrator to approve only those alternate materials or products which comply “with the intent of this code,” and which are “at least the equivalent of that prescribed in this code.” In theory, an administrator could approve cardboard pipe, but only if it could be shown to have a performance expectation equivalent to that of other approved piping materials. In summary, it is the intent of UPC, Chapter 3 (2003/2006/2009) to avoid limiting the use of alternative products which are equivalent or superior quality, strength, fire-resistance, effectiveness, durability, and safety over those prescribed by this code. However, it is not intended that indiscriminate approval be encouraged when such products fail to comply with code intent of this code or with good engineering practices. Product approval incurs a serious burden of liability and an implied responsibility for public health and safety.
UPC 2003 301.2
UPC 2006 301.2
UPC 2009 301.2
UPC 2012 301.2
Topic: Engineered Chemical Waste Systems
Can a chemical waste system be engineered when there is a pre-treatment facility at the point of connection to the building sewer?
Yes. The code states that the Authority Having Jurisdiction may approve alternate materials and methods of construction, provided that the Authority Having Jurisdiction finds that the proposed design is satisfactory and in compliance with the intent of the Uniform Plumbing Code.
UPC 2003 306.1
UPC 2006 306.1
UPC 2009 306.1
UPC 2012 305.1
Topic: Floor Drains in Residential Garages
Is the intent of Section 306.1, 305.1 (2012) to prohibit floor drains in the attached garage of a single-family dwelling?
It is not the intent of Section 306.1, 305.1 (2012) to prohibit the installation of floor drains in the attached garage of a single-family dwelling. Floor drains are not commonly installed in garages of single-family dwellings. However, there is nocode section that would prohibit the installation of a floor drain.
Floor drains subject to other than “domestic waste” would have to discharge through an industrial interceptor (clarifier) to prevent any damage to the private or public sewer system.
See also 1009.0 and 714.1
Floor drains subject to other than “domestic waste” would have to discharge through an industrial interceptor (clarifier) to prevent any damage to the private or public sewer system.
See also 1009.0 and 714.1
UPC 2003 306.1
UPC 2006 306.1
UPC 2009 306.1
UPC 2012 305.1
Topic: Floor Drains in Commercial Garages
As I read Section 306.1, 305.1 (2012) and Section 714.1, my concern focuses on floor drains in garages. What is the intent of these sections? Do we inform people that it is illegal to allow material and liquids that are harmful to the drainage system, or do we disallow floor drains in commercial garages?
It seems to me that if it is illegal to allow various materials and liquids to be introduced into the drainage
system, then we should not allow floor drains in commercial garages in any case.
It seems to me that if it is illegal to allow various materials and liquids to be introduced into the drainage
system, then we should not allow floor drains in commercial garages in any case.
The intent of Sections 306.1, 305.1 (2012) and 714.1 is to prevent damage to the drainage and sewer system by the discharge of other than domestic sewage. Damage to the drainage system can be avoided by the proper use of an interceptor (clarifier) as required by Section 1009.0, Industrial Interceptors (Clarifiers) and Separators. Floor drains in auto repair garages, car washes, photo labs, etc., which may receive waste that would
be harmful to the drainage and sewer system, shall be required to drain into an industrial interceptor (clarifier) before being discharged into a public or private sewer system.
be harmful to the drainage and sewer system, shall be required to drain into an industrial interceptor (clarifier) before being discharged into a public or private sewer system.
UPC 2003 308.1
UPC 2006 308.1
UPC 2009 308.1
UPC 2012 307.1
Topic: Private Sewers Crossing Property Lines
Section 218.0 defines private sewer as a building sewer that serves more than one building drain. Section 308.1 (2003/2006/2009) 307.1 (2012) prohibits the building sewer from crossing over private property lines, but does not prohibit a private sewer from doing so.
Please explain how the UPC addresses the concept of connecting several adjacent property building
sewers to a private sewer which crosses property lines to connect with the city sewer. The concept seems
to be in conflict with the intent of the UPC.
Please explain how the UPC addresses the concept of connecting several adjacent property building
sewers to a private sewer which crosses property lines to connect with the city sewer. The concept seems
to be in conflict with the intent of the UPC.
A private sewer is under the jurisdiction of the Authority Having Jurisdiction and therefore not permitted to
cross any property lines except at the point of connection to the public sewer. Two or more building sewers on a parcel of land, that is within the limits of the property line may connect to a private sewer, and may eventually be connected to the public sewer at the point of connection when approved by the Public Works Authority.
Buildings on adjoining lots shall not utilize a private sewer which crosses the property line separating
these lots.
There are times when, due to the unavailability of a sewer on a street, it may be necessary to obtain
permission from the city to cross an adjoining lot to connect to the public sewer in another street. This will
only be allowed when owners of both lots and the jurisdiction agree to a legal easement which is drawn on the proper form and recorded in the Office of the County Recorder.
cross any property lines except at the point of connection to the public sewer. Two or more building sewers on a parcel of land, that is within the limits of the property line may connect to a private sewer, and may eventually be connected to the public sewer at the point of connection when approved by the Public Works Authority.
Buildings on adjoining lots shall not utilize a private sewer which crosses the property line separating
these lots.
There are times when, due to the unavailability of a sewer on a street, it may be necessary to obtain
permission from the city to cross an adjoining lot to connect to the public sewer in another street. This will
only be allowed when owners of both lots and the jurisdiction agree to a legal easement which is drawn on the proper form and recorded in the Office of the County Recorder.
UPC 2003 310.2
UPC 2006 310.2
UPC 2009 310.2
UPC 2012 309.2
Topic: Lubrication of Hubless Cast Iron joints
Is it permissible for a lubricant and/or mastic material to be used with hubless bands?
The Installation Standard for Hubless Cast Iron Sanitary Systems (IS 6, 2003/2006/2009/2012), does not recommend the use of a lubricant with hubless joints. Some installers may try to use the material to stop leaks instead of using the required torque. The useof this material to seal the joint is in violation of Section 310.2.(2003/2006/2009) 309.2 (2012)
UPC 2003 310.4
UPC 2006 310.4
UPC 2009 310.4
UPC 2012 309.4
Topic: Hubless Transition joints
May hubless couplings be used for transitions between dissimilar materials?
Transitions between different types of materials must be made with couplings listed for the specific intended use. Listed couplings are available for transitions between DWV materials. See also 705.1.6, 705.1.8, 705.1.9 and IS 6 (2003/2006/2009), 705.4.2 (2012)
UPC 2003 311.1
UPC 2006 311.1
UPC 2009 311.1
UPC 2012 310.1
Topic: Sanitary Drainage
Can a side inlet quarter bend be used to vent a water closet? The fitting would be 3” with a 2” side outlet. That outlet would remain dry and tie to a vent stack 6” above the flood level rim of the fixture being served.
No, Section 311.1 of the 2009 UPC specifically prohibits the use of “double hub fittings, single or double tee branches, single or double tapped tee branches, side inlet quarter bends, running threads…” All pipe and fittings installed below the overflow rim of a fixture are considered drainage piping and shall meet the requirements of section 706.1. Side inlet ¼ bends are typically not manufactured with a direction of flow or sweep in the throat of the branch connection.
UPC 2003 311.3
UPC 2006 311.3
UPC 2009 311.3
UPC 2012 310.3
Topic: Closet Bends or Stubs
1. Would the UPC permit a lead waste to be wiped into a bend or stub beyond a certain distance from the closet opening and downstream from the closet vent?
2. Would the Code permit a vent to be wiped into a bend or stub?
3. By definition, what is a closet bend or stub?
4. At what point does it cease to be a closet bend or stub? At what point could waste be discharged into it?
2. Would the Code permit a vent to be wiped into a bend or stub?
3. By definition, what is a closet bend or stub?
4. At what point does it cease to be a closet bend or stub? At what point could waste be discharged into it?
1. Yes. The section of a closet bend or stub between the closet ring and the fixture vent should be categorized as a trap arm.
2. Yes. A lead vent pipe or suitable ferrule may be wiped to a lead closet bend or stub.
3. A closet bend is an approved fitting, which may include an integral or attached stub, receiving vertically discharged wastes from a water closet and changing their direction of flow, usually to horizontal. A closet stub is a vertical section of water closet trap arm, horizontal in the case of wall mounted water closets between a closet ring and the point of connection of the fixture vent.
4. A closet bend or stub ceases to be a trap arm immediately downstream from the point of fixture vent connection. At this point, additional waste piping may be connected.
2. Yes. A lead vent pipe or suitable ferrule may be wiped to a lead closet bend or stub.
3. A closet bend is an approved fitting, which may include an integral or attached stub, receiving vertically discharged wastes from a water closet and changing their direction of flow, usually to horizontal. A closet stub is a vertical section of water closet trap arm, horizontal in the case of wall mounted water closets between a closet ring and the point of connection of the fixture vent.
4. A closet bend or stub ceases to be a trap arm immediately downstream from the point of fixture vent connection. At this point, additional waste piping may be connected.
UPC 2003 311.4
UPC 2006 311.4
UPC 2009 311.4
UPC 2012 310.4
Topic: Single Stack Drainage and Venting Systems
Does Section 311.4 expressly prohibit Single Stack Drainage and Venting Systems ?
Section 311.4 prohibits the installation of "single stack drainage and venting systems with unvented branch lines " Section 301.2.2 (2003) 301.2 (2006/2009/2012) states, "The Authority Having Jurisdiction may approve any such alternate provided that the Authority Having Jurisdiction finds that the proposed design is satisfactory and complies with the intent of this Code."
It is the intent of this code that every trap be protected by a vent to guard "against siphonage and to ensure air circulation" throughout all parts of the drainage system. "Section 1003.3 (2003/2006/2009/2012) limits trap size increase to "not more than one pipe size larger than given in Table 7-3.(2003/2006/2009) Table 702.1 (2012)" Section 1004.0 (2003/2006/2009/2012) prohibits the use of "S" traps. None of these basic plumbing design provisions are possible when "unvented branch lines" are installed.
In summary, modern waste and vent systems have evolved from the one pipe systems of the late 1800's because science and empirical evidence have shown what works and does not work well. Meeting the intent of the UPC and modern plumbing system design cannot be achieved by installing oversized, unvented "S" traps as an "alternative" system. Opting for such systems simply ignores standard plumbing concepts which have been developed and proven during the past 100 years.
It is the intent of this code that every trap be protected by a vent to guard "against siphonage and to ensure air circulation" throughout all parts of the drainage system. "Section 1003.3 (2003/2006/2009/2012) limits trap size increase to "not more than one pipe size larger than given in Table 7-3.(2003/2006/2009) Table 702.1 (2012)" Section 1004.0 (2003/2006/2009/2012) prohibits the use of "S" traps. None of these basic plumbing design provisions are possible when "unvented branch lines" are installed.
In summary, modern waste and vent systems have evolved from the one pipe systems of the late 1800's because science and empirical evidence have shown what works and does not work well. Meeting the intent of the UPC and modern plumbing system design cannot be achieved by installing oversized, unvented "S" traps as an "alternative" system. Opting for such systems simply ignores standard plumbing concepts which have been developed and proven during the past 100 years.
UPC 2003 311.5
UPC 2006 311.5
UPC 2009 311.5
UPC 2012 310.5
Topic: Use of Bushings in Drainage Systems
Can a bushing (e.g. 3" x 2") be used to increase the size of a drainline?
No. Section 311.5 (2003/2006/2009) 310.5 (2012) prohibits any piping connection which "retards the flow of water, wastes, sewage or air, in the drainage or venting systems in an amount greater than the normal frictional resistance to flow." The shape and design of listed drainage fittings provide a slope when graduating from a smaller to a larger pipe size. This slope accelerates and helps maintain a steady flow of the waste products being transported.
Conversely, an abrupt 90 degree drop from one elevation to another tends to dissipate the energy
gained during its vertical change in elevation, as a result of the 90 degree impact at the base of the drop.
Liquid will flow both upstream and downstream from such vertical impacts (which is why directional fitting are required from vertical to horizontal drainlines), with the resulting likelihood that solids will be left behind, and a greater incidence of stoppages or pipe fouling will occur.
Flat-faced bushings or reducers have few appropriate applications in piping systems, whether they be
DWV, water, or gas piping installations.
Conversely, an abrupt 90 degree drop from one elevation to another tends to dissipate the energy
gained during its vertical change in elevation, as a result of the 90 degree impact at the base of the drop.
Liquid will flow both upstream and downstream from such vertical impacts (which is why directional fitting are required from vertical to horizontal drainlines), with the resulting likelihood that solids will be left behind, and a greater incidence of stoppages or pipe fouling will occur.
Flat-faced bushings or reducers have few appropriate applications in piping systems, whether they be
DWV, water, or gas piping installations.
UPC 2003 311.6
UPC 2006 311.6
UPC 2009 311.6
UPC 2012 310.6
Topic: Intermembering of Dissimilar Metals
It has been generally accepted that any number of different materials may be used in a drainage system in their proper locations, as long as the correct transitional fittings are used. Section 311.6 (2003/2006/2009) 310.6 (2012) would seem to dispute this. Would you say that the transition from DWV cast iron pipe to copper pipe/tubing inside the wall is allowed by this section?
Yes. An in-wall caulked or screwed transition from DWV cast iron pipe to copper pipe/tubing, or a similar underground change to Type L copper does not violate the intent of the code. Historically, mixing of metals in drainage systems has not been a problem, as evidenced by the traditional and frequently required intermembering of lead, tin, copper, and brass with each other and with ferrous metals in the manufacture and installation of traps, ferrules, cleanouts, drains, and caulked joints.
UPC 2003 313.1
UPC 2006 313.1
UPC 2009 313.1
UPC 2012 312.1
Topic: Sealing of Voids Around Pipes
Are voids around piping passing through concrete floors on the ground required to be appropriately sealed? For example, in houses with slab on grade construction, where the drain line for the tub and shower penetrates the slab, is this plumbing opening area required to be sealed?
Yes. Plumbing openings in an on-grade slab within the fixed limits of the building foundation shall be "appropriately sealed" to prevent insects or vermin from entering the building.
It is the responsibility of the local Authority Having Jurisdiction to determine if an opening is "appropriately
sealed" since there are different methods used such as installing certain types of tub boxes, grouting,
etc
It is the responsibility of the local Authority Having Jurisdiction to determine if an opening is "appropriately
sealed" since there are different methods used such as installing certain types of tub boxes, grouting,
etc
UPC 2003 313.2
UPC 2006 313.2
UPC 2009 313.2
UPC 2012 312.2
Topic: Piping Protection
Section 313.2 (2003/2006/2009) 312.3 (2012) prohibits indiscriminate embedment of piping in concrete or masonry. What is considered adequate pipe protection? Will plastic tape wrapped around ABS provide acceptable stress relief or should some loose material be used so that the piping can move freely?
The variables involved in stress protection of piping obviously preclude fixed code requirements. Remedial procedures must therefore be field-tailored to specific installations. Because the expansion factor of ferrous metals approximates that of concrete, structural damage and
settlement stresses have been the prime considerations when embedding such materials. Plastic materials ,having much higher expansion potential, require more careful consideration. Treatment of embedded longitudinal sections of plastic piping should provide for anticipated movement and freedom of branches, risers, etc., from stress and abrasion.
Plastic piping passing through walls, footings and slabs should be wrapped or sleeved to provide for
commensurate movement. Adhesive plastic tape wrapped tightly around ABS will afford questionable
freedom and doubtful protection.
Where the passage of moisture or vermin are factors, non-hardening mastic or several thicknesses of
tightly wrapped 15 pound felt or comparable deterioration-resistant non-adhesive wrapping should be
used. In other areas, reasonable freedom from stress and abrasion should suffice. Installation Standard IS 5 includes further pertinent information regarding thermal expansion.
settlement stresses have been the prime considerations when embedding such materials. Plastic materials ,having much higher expansion potential, require more careful consideration. Treatment of embedded longitudinal sections of plastic piping should provide for anticipated movement and freedom of branches, risers, etc., from stress and abrasion.
Plastic piping passing through walls, footings and slabs should be wrapped or sleeved to provide for
commensurate movement. Adhesive plastic tape wrapped tightly around ABS will afford questionable
freedom and doubtful protection.
Where the passage of moisture or vermin are factors, non-hardening mastic or several thicknesses of
tightly wrapped 15 pound felt or comparable deterioration-resistant non-adhesive wrapping should be
used. In other areas, reasonable freedom from stress and abrasion should suffice. Installation Standard IS 5 includes further pertinent information regarding thermal expansion.
UPC 2003 313.2
UPC 2006 313.2
UPC 2009 313.2
UPC 2012 312.3
Topic: Embedding Piping in Concrete or Masonry
Does Section 313.2 (2003/2006/2009) 312.3 (2012) prohibit the direct embedment of hubless cast iron pipe in a concrete slab on grade or in a trench backfilled with concrete or a concrete slurry?
Yes. All piping in connection with a plumbing system shall be so installed that piping or connections will not be subject to undue strains or stresses, and provisions shall be made for expansion, contraction, and structural settlement. Direct embedment of piping in concrete or masonry is in conflict with this objective and is, therefore, unacceptable under any and all conditions.
UPC 2003 313.4
UPC 2006 313.4
UPC 2009 313.3
UPC 2012 312.3
Topic: Approved Materials
Is there a minimum depth of cover for cast iron pipe used as a sewer piping (in a trench)?
Section 3.1.3 of Installation Standard IS 1-91 (2003), Non-Metallic Building Sewers (IS 1, 2006/2009/2012) requires a minimum burial depth of 12 inches below the surface of finish grade. Hubless cast iron used as sewer piping does not carry this restriction.
UPC 2003 314.4
UPC 2006 314.4
UPC 2009 314.4
Topic: Isolation of Piping
I understand that for corrosion (electrolysis) to occur, dissimilar metals must be joined together and exposed to wet or damp conditions. The water is the catalyst for the corrosion process. Without the touching of water, steel and copper, there could not be a problem. Is it required to isolate copper piping from the steel hanger?
There is a possibility of either corrosion or electrolysis when a difference in potential exists between metals. Abrasive action caused by expansion, contraction, vibration, and the possibility of condensate generation, may result in a condition requiring some means of isolating the copper pipe from the steel hanger to prevent premature failure.
For these reasons, Section 314.4 (2003/2006/2009) states, in part, "Piping shall be isolated from
incompatible materials."
For these reasons, Section 314.4 (2003/2006/2009) states, in part, "Piping shall be isolated from
incompatible materials."
UPC 2003 313.6
UPC 2006 313.6
UPC 2009 313.6
UPC 2012 312.6
Topic: Protection of Piping from Freezing
Are exposed waste lines beneath floors, such as, cantilevered or post-supported portions of residences, required to be insulated. It seems evident that the enforcement of this provision would relate to climatic conditions. Because of
this factor, are there any guidelines or stipulations relating to the climatic conditions which would allow a
relaxation of the requirement for insulating exposed waste pipes? Does Section 313.6 (2003/2006/2009) 312.6 (2012) prohibit this practice
this factor, are there any guidelines or stipulations relating to the climatic conditions which would allow a
relaxation of the requirement for insulating exposed waste pipes? Does Section 313.6 (2003/2006/2009) 312.6 (2012) prohibit this practice
You are correct that the insulation of exposed waste lines may be required as a consequence of climatic
conditions. Section 313.6 (2003/2006/2009) 312.6 (2012) states that “No water, soil or waste pipe shall be installed or permitted outside of a building or in an exterior wall unless, where necessary, adequate provision is made to protect such pipe from freezing.” If there is no way to install the waste lines other than exposed beneath floors or under cantilevers, then adequate provision shall be made to protect such pipes from freezing.
It appears that the key word is adequate. What may be adequate in one section of the country may not
be adequate in another section of the country. It is the responsibility of local Administrative Authorities to
establish appropriate guidelines.
conditions. Section 313.6 (2003/2006/2009) 312.6 (2012) states that “No water, soil or waste pipe shall be installed or permitted outside of a building or in an exterior wall unless, where necessary, adequate provision is made to protect such pipe from freezing.” If there is no way to install the waste lines other than exposed beneath floors or under cantilevers, then adequate provision shall be made to protect such pipes from freezing.
It appears that the key word is adequate. What may be adequate in one section of the country may not
be adequate in another section of the country. It is the responsibility of local Administrative Authorities to
establish appropriate guidelines.
UPC 2003 313.6
UPC 2006 313.6
UPC 2009 313.6
UPC 2012 312.6
Topic: Insulating Water and Waste Lines
Do water lines in a ventilated attic space have to be insulated? Do water and waste lines installed underneath a ventilated home or cabin have to be insulated?
Since climates vary in different areas, it is the responsibility of the local Authority Having Jurisdiction to
specify requirements regarding protection from freezing of water, soil, or waste piping, or other affected
system components.
Insulating is one, but not the only, method of protecting piping from freezing. Section 313.6 (2003/2006/2009) 312.6 (2012) is provided to be used by a jurisdiction to enforce local adequate requirements or provisions for a trouble-free installation.
See Section 609.1 regarding yard piping and local frost depth.
specify requirements regarding protection from freezing of water, soil, or waste piping, or other affected
system components.
Insulating is one, but not the only, method of protecting piping from freezing. Section 313.6 (2003/2006/2009) 312.6 (2012) is provided to be used by a jurisdiction to enforce local adequate requirements or provisions for a trouble-free installation.
See Section 609.1 regarding yard piping and local frost depth.
UPC 2003 315.4
UPC 2006 315.4
UPC 2009 315.4
UPC 2012 314.4
Topic: Backfill Material
Would it be possible to define stone as to its intent in Section 315.4 (2003/2006/2009) 314.4 (2012)?
The language of this section prohibits the use of materials which by their shape or size might cause mechanical damage, or create stresses on piping materials which could result in failure over a period of
time. Stone is a generic term which is not well defined as are the terms rock, boulder, and gravel.
time. Stone is a generic term which is not well defined as are the terms rock, boulder, and gravel.
UPC 2003 315.4
UPC 2006 315.4
UPC 2009 315.4
UPC 2012 314.4
Topic: Backfill Around PVC Piping
Does Section 315.4 (2003/2006/2009) 314.4 (2012)regulate the backfill of trenches when PVC Pipe is installed?
Yes. Section 315.4 (2003/2006/2009) 314.4 (2012) regulates the backfill of all trenches, regardless of the type of pipe material.
UPC 2003 316.1.3
UPC 2006 316.1.3
UPC 2009 316.1.3
UPC 2012 605.3.4
Topic: Lead in Solder and Sweat joints
Would lead-free solder joints, capped with 50-50 solder be in violation of Section 316.1.3 (2003/2006/2009), 605.3.4 (2012)
Yes. It is impossible to determine if the potable water has been contaminated with lead when 50-50 solder is applied in conjunction with lead-free solder.
UPC 2003 316.1.3
UPC 2006 316.1.3
UPC 2009 316.1.3
UPC 2012 605.3.4
Topic: Removing Excess Flux from Soldered joints
The IAPMO Installation Standards require the removal of excess flux from a brazed joint. There is no mention about the removal of flux from a soldered joint. When using a non-corrosive type flux as required
in Section 316.1.3 (2003/2006/2009) 605.3.4 (2012), is it necessary to remove the excess flux?
in Section 316.1.3 (2003/2006/2009) 605.3.4 (2012), is it necessary to remove the excess flux?
Yes. The IAPMO Installation Standard 3, Section 316.1.2 (2003), Section 2.3.1 (2006/2009/2012) refers to solder joints. Section 316.1.2.9 (2003), 2.3.10 (2006/2009/2012) states, “After the joint has been completed; when cool, clean off any remaining flux with a wet rag.”
UPC 2003 316.1.5
UPC 2006 316.1.5
UPC 2009 316.1.5
UPC 2012 605.8.1.1
Topic: Use of Compression Repair Coupling
Are compression repair couplings exempt from the requirements of the UPC?
A compression repair coupling must be constructed to applicable standards, tested and listed, and then installed per the listing limitations and applicable code requirements.
UPC 2006 316.1.6
UPC 2009 316.1.6
UPC 2012 705.10.4
Topic: Solvent Cement Plastic Pipe joints
When making a transition joint within a building from ABS DWV to PVC DWV may ABS to PVC transition
solvent cement be used?
solvent cement be used?
No. Section 316.1.6 (2006/2009), 705.10.4 (2012) limits the use of ABS/PVC transition solvent cement to the connection between the building drain and building sewer. In addition, the IAPMO listing for this specific product states:
“Solvent cements to provide a means for joining ABS non-pressure piping systems using a solvent
cemented transition joint, for example, joining an ABS building drain to a PVC sewer system. Such products
are not considered as all purpose ABS-PVC solvent cements that would be used for mixing of ABS &
PVC piping materials nor can such solvent cements be used for joining either material.”
“Solvent cements to provide a means for joining ABS non-pressure piping systems using a solvent
cemented transition joint, for example, joining an ABS building drain to a PVC sewer system. Such products
are not considered as all purpose ABS-PVC solvent cements that would be used for mixing of ABS &
PVC piping materials nor can such solvent cements be used for joining either material.”
UPC 2003 316.1.6
UPC 2006 316.1.6
UPC 2009 316.1.6
UPC 2012 705.10.4
Topic: Solvent Cement Plastic Pipe Joints
The code section states that a solvent cement transition joint between ABS and PVC building drain and building sewer shall be made using a listed transition solvent cement.
Can the listed transition solvent cement be used at other locations to join ABS and PVC?
Can the listed transition solvent cement be used at other locations to join ABS and PVC?
No. Section 316.1.6 specifically states that “a solvent cement transition joint between ABS and PVC building drain and building sewer shall be made using a listed transition solvent cement”.
All other transitions from ABS to PVC piping shall be made by listed transition couplings that are referenced in Table 14.1
Additionally, the application explanation for a listed ABS/PVC transition glue (see IAPMO listing #4575) states that “ Solvent cements to provide a means for joining ABS non-pressure piping systems using a solvent cemented transition joint, for example, joining an ABS building drain to a PVC sewer system. Such products are not considered as all purpose ABS-PVC solvent cements that would be used for mixing of ABS & PVC piping materials nor can such solvent cements be used for joining either material.”
All other transitions from ABS to PVC piping shall be made by listed transition couplings that are referenced in Table 14.1
Additionally, the application explanation for a listed ABS/PVC transition glue (see IAPMO listing #4575) states that “ Solvent cements to provide a means for joining ABS non-pressure piping systems using a solvent cemented transition joint, for example, joining an ABS building drain to a PVC sewer system. Such products are not considered as all purpose ABS-PVC solvent cements that would be used for mixing of ABS & PVC piping materials nor can such solvent cements be used for joining either material.”
UPC 2003 316.2.2
UPC 2006 316.2.2
UPC 2009 316.2.2
UPC 2012 315.1
Topic: Unions on Water Lines
Can a union in a potable water line be concealed in a wall without an access provided?
Yes. Section 316.2.2 (2003/2006/2009) 315.1 (2012) states that approved unions may be used at any point in the water supply system. The code does not preclude the installation of a union in connection with water piping within a wall or other concealed space, nor does it require that access be provided.
The only exceptions would be installations where a union is used to make a transition between dissimilar
metals or where the union is required for system maintenance
The only exceptions would be installations where a union is used to make a transition between dissimilar
metals or where the union is required for system maintenance
UPC 2003 301.1.1
UPC 2006 301.1.1
UPC 2009 301.1.1
UPC 2012 301.1.1
Topic: Marking
Is it the intent of section 301.1.1 that all pipe, pipe fittings, traps, fixtures, material, and devices used in a plumbing system shall be listed by a recognized third part to one of the recognized standards in Chapter 14?
Comment
background: A jurisdiction in Oregon reading the intent of this section that all products shall be certified, even if there is not a recognized standard listed in the code. If this were section were consistently enforced in this way, construction would literally stop in UPC code areas as there are thousands of sundry plumbing products that are not listed (no shield,) and do not have a standard associated with them.
Comment
background: A jurisdiction in Oregon reading the intent of this section that all products shall be certified, even if there is not a recognized standard listed in the code. If this were section were consistently enforced in this way, construction would literally stop in UPC code areas as there are thousands of sundry plumbing products that are not listed (no shield,) and do not have a standard associated with them.
All products used in a plumbing system must be listed to a recognized standard. The job of an approved listing agency is to ensure that the product has been manufactured to the appropriate standard. The AHJ has the right and authority to approve products other than those that have been appropriately listed. The code does not state that IAPMO-UPC is the only approved listing agency for this requirement.
Section 301.1.1 requires materials used in a plumbing system to be listed or labeled to approved standards. Section 301.2 Alternate Materials and Methods is in the code to provide a method of obtaining approval of a product or method when there is no standard for the product. You must go to the authority having jurisdiction and request their approval of your product and provide them the necessary proof to show your product will be equivalent to similar systems and do the job intended. The code does not require that a standard be developed before you can ask for approval.
Section 301.1.1 requires materials used in a plumbing system to be listed or labeled to approved standards. Section 301.2 Alternate Materials and Methods is in the code to provide a method of obtaining approval of a product or method when there is no standard for the product. You must go to the authority having jurisdiction and request their approval of your product and provide them the necessary proof to show your product will be equivalent to similar systems and do the job intended. The code does not require that a standard be developed before you can ask for approval.
UPC 2009 316.1.6
UPC 2012 IS 9-2006 2.1.4.1; 705.7.2
UPC 2015 705.5.2
Topic: Solvent Cement
Does IAPMO/UPC recognize "clear" Primer that meets ASTM F656 as being code compliant with the purple primer color requirement in 705.7.2 and IS 9-2006 Section 2.3.4.1?
Primers that meet ASTM F656 must be purple in color in order to be in compliance with Section 316.1.6 (2009), 705.7.2 (2012 UPC), 705.5.2 (2015) and as noted in the IS 9-2006 2.1.4.1. The purple coloring is the only means that allows the owners, installers and the inspectors to verify that required listed primers were applied.
Code changes have been proposed in recent code cycles to permit primer tinted purple, but that can only be seen by the use of a UV light. To our knowledge this code change has not been approved because many code compliance departments do not want to equip their inspectors with UV detecting equipment.
Code changes have been proposed in recent code cycles to permit primer tinted purple, but that can only be seen by the use of a UV light. To our knowledge this code change has not been approved because many code compliance departments do not want to equip their inspectors with UV detecting equipment.
UPC 2009 307.1
UPC 2012 305.1
UPC 2015 305.1
Topic: Neutralization of Acidic Condensate
What section of the UPC code addresses the neutralization or dilution of the acidic condensate from condensing appliances (boilers, furnaces and water heaters)? It seems that Section 307.1 (2009), 305.1 (2012/ 2015) might apply but it is pretty general.
Drains for condensate should be installed in accordance with the appliance and the vent manufacturer’s installation instructions (NFPA 54-12: 12.9.4). Condensate acid neutralizers to maintain the PH levels required by the local sewer department or the Authority Having Jurisdiction should be installed. Section 307.1 (2009), 305.1 (2012/ 2015) does state that anything that causes damage to the drainage system cannot drain into it but does not specifically state corrosive condensate. Sections 807.3 (2009/ 2012), 807.2 (2015) Undiluted Condensate Waste and Section 811.0 Chemical Wastes list requirements for the protection of the drainage systems and its materials.
UPC 2009 312
UPC 2012 311.0
UPC 2015 311.0
Topic: Building Drains and Building Sewers
Does the Uniform Plumbing Code address building drainage systems in multi-family dwellings? Is each dwelling unit required to be on separate building drains until they reach the building sewer, or can they all tie together into one building drain within the building?
In general, the building drains for units in a multifamily building, such as apartments or condominium, are not required to be separate from other units. The exception to this are attached town homes that must have their own separate building drains because they are on their own lots and considered as separate properties.
UPC 2009 311.5; 408.4.1
UPC 2012 310.5, 402.6
UPC 2015 310.5, 402.6
Topic: Offset Closet Flange
Are water closet flanges with a 2" offset acceptable to the UPC?
Offset closet flanges may obstruct flow if it does not comply with the applicable standard required by the UPC. Table 7-1 (2009), Table 701.1 (2012), Table 701.2 (2015) requires PVC fittings to comply with ASTM D2665. In that standard it references ASTM D3311, which is the standard for DWV plastic fittings patterns. The pattern for an offset closet flange has to be free of ledges and corners that would obstruct flow. Section 311.5 (2009), 310.5 (2012,/2015) states “no fitting, fixture, and piping connection, appliance, device, or method of installation that obstructs or retards the flow of water, wastes, sewage, or air into the drainage or venting system, in an amount exceeding the normal frictional resistance to flow, shall be use.”
UPC 2009 318
UPC 2012 317.1
UPC 2015 317.1
Topic: Food Handling Establishments
When a tenant improvement with food handling area takes place under an existing tenant above, should the soil and drain lines from above have a drain pan placed under them to catch any leaks?
If so, how should that pan be connected to the sewer?
Is this a proper use of this code section or are there others better suited for this issue?
If so, how should that pan be connected to the sewer?
Is this a proper use of this code section or are there others better suited for this issue?
Section 318.0 (2009), 317.1 (2012/ 2015) gives specific requirements for soil and waste piping located above food handling areas. This code section does not specifically require a drain pan under all of the piping, but does require 1) a minimum number of joints; 2) openings in the floor to be sealed with the floor assembly; 3) floor drains and shower drains be equipped with integral seepage pans; 4)soil and drain piping to be of an approved material per Table 14-1 (2009), Table 1401.1 (2012), Table 1701.1 (2015); and Section Table 7-1 (2009), Table 701.1 (2012), 701.2 (2015); 5) piping subject to the creation of condensation be insulated; and 6) where waste piping is located above food handling areas the ceiling must be removable for inspection and repair of the piping.
UPC 2006 311.6
UPC 2012 310.6 605.16
UPC 2015 310.6, 605.16
Topic: Dissimilar materials
What is the code section regarding dissimilar materials, such as brass and galvanized nipple interconnections
The sections are as follows 310.6 Dissimilar Metals, 605.16 Dielectric unions, 605.17 Joints Between Various Materials and 1210.1.3 Protection Against Corrosion. These sections are requirements for several different types of installations.
UPC 2009 31.1.2
UPC 2012 301.1.1
UPC 2015 301.2.1, 408.0
UPC 2018 301.2.1, 408.0
Topic: Marking
1. For shower valves (the rough in valves set into the wall), what would be the part that should be stamped with cUPC?
2. Is the stamp required for all parts, or would the certification listing be sufficient for building inspection?
2. Is the stamp required for all parts, or would the certification listing be sufficient for building inspection?
1.The Uniform Plumbing Code requires, pipe, pipe fittings, traps, fixtures, material, and devices used in a plumbing system to be listed or labeled by a listing agency and to comply with approved applicable standards. The listing agencies certificate for the product dictates where the mark of conformity will be located.
2. The certificate of compliance issued by the listing agency will dictate where the mark of conformity, if required on the product, is located.
2. The certificate of compliance issued by the listing agency will dictate where the mark of conformity, if required on the product, is located.
UPC 2018 312.3
Topic: Building Sewer and Drainage Piping
1. Are building sewers constructed of pipe materials approved for use under or within a building required to be installed at least one foot below the surface of the ground?
2. Are there exceptions permitting above ground placement of building sewers?
Comment:
If above ground construction of building sewers is permitted, provide the section(s) within the UPC that regulate the above ground construction.
2. Are there exceptions permitting above ground placement of building sewers?
Comment:
If above ground construction of building sewers is permitted, provide the section(s) within the UPC that regulate the above ground construction.
1. Per Table 701.2 of the 2018 Uniform Plumbing Code, all materials approved for building drains* are listed as “Underground Drain, Waste, Vent Pipe and Fittings. The table also lists the materials for building sewers** in the column marked “Building Sewer Pipe and Fittings”.
2. Consult Table 701.2 for the materials that would be acceptable for “Above Ground Drain, Waste, Vent Pipe and Fittings”.
*Section 204.0 2018 UPC - Building Drain. That part of the lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside the walls of the building and conveys it to the building sewer beginning 2 feet (610 mm) outside the building wall.
**Section 204.0 2018 UPC - Building Sewer. That part of the horizontal piping of a drainage system that extends from the end of the building drain and that receives the discharge of the building drain and conveys it to a public sewer, private sewer, private sewage disposal system, or another point of disposal
2. Consult Table 701.2 for the materials that would be acceptable for “Above Ground Drain, Waste, Vent Pipe and Fittings”.
*Section 204.0 2018 UPC - Building Drain. That part of the lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside the walls of the building and conveys it to the building sewer beginning 2 feet (610 mm) outside the building wall.
**Section 204.0 2018 UPC - Building Sewer. That part of the horizontal piping of a drainage system that extends from the end of the building drain and that receives the discharge of the building drain and conveys it to a public sewer, private sewer, private sewage disposal system, or another point of disposal
UPC 2009 313.3, 718.3
Topic: Burial Depth
The language regarding burial depth in these sections is “below the surface of the ground”.
1. Is that measured from the ground surface to the top of the pipe?
2. Is that measured from the ground surface to the invert elevation of the pipe?
3. Please clarify distances between pipes…… is it surface to surface or center line to center line?
1. Is that measured from the ground surface to the top of the pipe?
2. Is that measured from the ground surface to the invert elevation of the pipe?
3. Please clarify distances between pipes…… is it surface to surface or center line to center line?
1. The depth is measured from the surface of the ground to the top of the pipe, which would provide the required one foot of earth coverage for the entire pipe, as required by Sections 313.3 and 718.3 of the 2009 Uniform Plumbing Code.
2. It is the opinion of this committee that the clearances would be measured edge to edge.
2. It is the opinion of this committee that the clearances would be measured edge to edge.
UPC 2018 311.0
Topic: Independent Systems
1. Would this section apply to new detached accessory dwelling units requiring a separate drainage system.
2. Could the building drain of the main dwelling unit extend to serve a new detached accessory dwelling unit if a side yard, driveway, or court is available for constructing the building sewer.
Comment:
Due to new legislation in California we are getting a lot of permits for accessory dwelling units as a low cost solution to housing shortages. Our jurisdiction has gotten significant push from applicants due to the costs incurred installing an independent drainage system.
2. Could the building drain of the main dwelling unit extend to serve a new detached accessory dwelling unit if a side yard, driveway, or court is available for constructing the building sewer.
Comment:
Due to new legislation in California we are getting a lot of permits for accessory dwelling units as a low cost solution to housing shortages. Our jurisdiction has gotten significant push from applicants due to the costs incurred installing an independent drainage system.
1. Yes. Section 311.1 of the 2018 Uniform Plumbing Code, specifically requires drainage systems from new buildings and/or new work in existing buildings to connect separately and independently to a public or private sewer*.
2. No. The exception to Section 311.1 permits the extension of a building drain to another building on the same lot, only if a private sewer is not accessible by means of an adjoining court, yard or driveway.
Private Sewer. A building sewer that receives the discharge from more than one building drain and conveys it to a public sewer, private sewage disposal system, or another point of disposal.
2. No. The exception to Section 311.1 permits the extension of a building drain to another building on the same lot, only if a private sewer is not accessible by means of an adjoining court, yard or driveway.
Private Sewer. A building sewer that receives the discharge from more than one building drain and conveys it to a public sewer, private sewage disposal system, or another point of disposal.
UPC 2018 313.0
Topic: Strut Mounting Clamps
Are there any general or specific plumbing code requirements for ‘strut mounted clamps’ to secure piping in a plumbing, hydraulic or refrigeration systems?
Comment:
Follow attached link and review page 2 and 9
Comment:
Follow attached link and review page 2 and 9
Yes. Section 301.2 of the 2018 Uniform Plumbing Code requires “pipe, pipe fittings, traps, fixtures, material, and devices used in a plumbing system “to be third-party accredited as complying with recognized applicable recognized standards. Section 313.2 states that, “hangers and anchors shall be of sufficient strength to support the weight of the pipe and its contents. Piping shall be isolated from incompatible materials.” Additionally, the pipe must be supported at intervals shown in Table 313.3.
UPC 2009 314.4
Topic: Installation
Is there any section in the UPC that specifies that a cold supply copper line cannot touch a hot supply line or that it needs to be wrapped in 10 mil tape or something along those lines?
Comment:
We have a building in Irvine, CA where the same problem has occurred in several units because hot and cold copper lines are touching. The HOA is making each resident pay for the damage instead of assuming responsibility for the builders improper installation.
Comment:
We have a building in Irvine, CA where the same problem has occurred in several units because hot and cold copper lines are touching. The HOA is making each resident pay for the damage instead of assuming responsibility for the builders improper installation.
No. Nothing in the 2009 Uniform Plumbing Code specifically prohibits copper hot and cold water lines from being in contact with each other. Section 313.0 does however require the protection of piping, material and structures. Section 313.2 states that “…piping or connections will not be subject to undue stains or stresses and provisions shall be made for expansion, contraction, and structural settlement.” Additionally, Section 313.4 requires piping subject to corrosion, erosion, or mechanical damage to be protected in an approved manner.
UPC 2018 301.2, 705.6.2
Topic: Solvent Cement
1. Is PVC Gorilla solvent cement one-step self-priming process acceptable for PVC joints?
2. Does the Gorilla glue product comply with the approved applicable recognized standards referenced in UPC for joining PVC?
Comment:
Gorilla glue for PVC joints states it is the only PVC Cement that meets ASTM F656-02 for use as a primer and ASTM D2564-02 for use as a cement.
2. Does the Gorilla glue product comply with the approved applicable recognized standards referenced in UPC for joining PVC?
Comment:
Gorilla glue for PVC joints states it is the only PVC Cement that meets ASTM F656-02 for use as a primer and ASTM D2564-02 for use as a cement.
1. No. One-step PVC solvent cement does not meet the requirements found in Chapter 7 of the 2018 Uniform plumbing Code. Per Section 705.6.2, joints for PVC-DWV pipe and fittings are made using a two-step process. The first step is to apply purple primer to the pipe and fittings, which is listed to the standard ASTM F656 followed by the application of a solvent cement listed to ASTM D2564.
2. Gorilla Glue is not listed by IAPMO to either ASTM F656 or ASTM D2564. This product may be listed by another listing agency, as permitted in Section 301.2, but would need approval by the Authority Having Jurisdiction prior to its use.
2. Gorilla Glue is not listed by IAPMO to either ASTM F656 or ASTM D2564. This product may be listed by another listing agency, as permitted in Section 301.2, but would need approval by the Authority Having Jurisdiction prior to its use.
UPC 2018 310.1, 704.2
Topic: Fixture Connection Fittings
1. Please clarify what seems to be conflict outlined below in the comments
Comments:
That last phrase of 310.1 is an exception permitting a ‘Double Hub Sanitary Tapped Tee’ on a vertical line as a fixture connection. The language of section 704.2 seems to limit that fitting to a Double Fixture Fitting.
Comments:
That last phrase of 310.1 is an exception permitting a ‘Double Hub Sanitary Tapped Tee’ on a vertical line as a fixture connection. The language of section 704.2 seems to limit that fitting to a Double Fixture Fitting.
The double hub sanitary tapped tee, referenced in Section 310.1 of the 2018 Uniform Plumbing Code, existed around 75 years ago. According to representatives of the Cast Iron Soil Pipe Institute (CISPI), the cast iron fitting had a hub on both ends of the fitting with a sanitary tapped tee for the branch, and was used to connect a single plumbing fixture to a vertical waste line.
UPC 2018 315.1
Topic: Unions
1. Is a union allowed in the riser from the underground gas line to the building fuel gas piping?
2. Is a union also allowed in LP gas systems where it connecta to piping entering a building?
3. Are unions allowed in fuel gas piping in open accessible areas within a structure?
4. Are unions allowed in fuel gas piping outside of buildings above grade?
Comment:
315.1 lists the allowed uses for unions. In fuel gas piping only as allowed in 1212.6. Taken literally no unions are allowed at other location.
2. Is a union also allowed in LP gas systems where it connecta to piping entering a building?
3. Are unions allowed in fuel gas piping in open accessible areas within a structure?
4. Are unions allowed in fuel gas piping outside of buildings above grade?
Comment:
315.1 lists the allowed uses for unions. In fuel gas piping only as allowed in 1212.6. Taken literally no unions are allowed at other location.
The 2018 Uniform Plumbing Code, does not restrict the use of listed unions for gas piping installations except for piping in concealed locations as found in Section 1210.3. Note: Section 1212.5.1 referenced in Section 315.1 was changed by an errata to Section 1212.6. This code section requires a union or flanged connection downstream of an appliance shutoff valve.
UPC 2018 311.0
Topic: Independent Systems
1. Would this section apply to new detached accessory dwelling units requiring a separate drainage system.
2. Could the building drain of the main dwelling unit extend to serve a new detached accessory dwelling unit if a side yard, driveway, or court is available for constructing the building sewer.
2. Could the building drain of the main dwelling unit extend to serve a new detached accessory dwelling unit if a side yard, driveway, or court is available for constructing the building sewer.
1. Yes. Section 311.1 of the 2018 Uniform Plumbing Code, specifically requires drainage systems from new buildings and/or new work in existing buildings to connect separately and independently to a public or private sewer*.
2. No. The exception to Section 311.1 permits the extension of a building drain to another building on the same lot, only if a private sewer is not accessible by means of an adjoining court, yard or driveway.
Private Sewer. A building sewer that receives the discharge from more than one building drain and conveys it to a public sewer, private sewage disposal system, or another point of disposal.
2. No. The exception to Section 311.1 permits the extension of a building drain to another building on the same lot, only if a private sewer is not accessible by means of an adjoining court, yard or driveway.
Private Sewer. A building sewer that receives the discharge from more than one building drain and conveys it to a public sewer, private sewage disposal system, or another point of disposal.
UPC 2018 301.2, 705.6.2
Topic: Solvent Cement
1. Are one-step solvent cements acceptable for PVC joints?
1. No. One-step PVC solvent cement does not meet the requirements found in Chapter 7 of the 2018 Uniform plumbing Code. Per Section 705.6.2, joints for PVC-DWV pipe and fittings are made using a two-step process. The first step is to apply purple primer to the pipe and fittings, which is listed to the standard ASTM F656 followed by the application of a solvent cement listed to ASTM D2564.
UPC 2018 315.1
Topic: Unions
1. Is a union allowed in the riser from the underground gas line to the building fuel gas piping?
2. Is a union also allowed in LP gas systems where it connecta to piping entering a building?
3. Are unions allowed in fuel gas piping in open accessible areas within a structure?
4. Are unions allowed in fuel gas piping outside of buildings above grade?
2. Is a union also allowed in LP gas systems where it connecta to piping entering a building?
3. Are unions allowed in fuel gas piping in open accessible areas within a structure?
4. Are unions allowed in fuel gas piping outside of buildings above grade?
The Uniform Plumbing Code, does not restrict the use of listed unions for gas piping installations except for piping in concealed locations as found in Section 1210.3. Note: Section 1212.5.1 referenced in Section 315.1 was changed by an errata to Section 1212.6. This code section requires a union or flanged connection downstream of an appliance shutoff valve.
UPC 2018 312.12.2
Topic: Metal Collars
1. Where this section states "In or on buildings...", does this include internal walls or is it specific to pipe entering the building from the exterior?
2. Since most openings, if not all openings, are caulked to prevent an opening, would this meet the intent if the requirement is for all penetrations?
Comment:
The code section seems to indicate every wall where piping passes requires an approved metal collar which is securely attached to structure, including penetrations through non-structural interior walls. Pipe passing through a gypsum board wall would need to have a metal plate securely attached to structure which is the gypsum board.
2. Since most openings, if not all openings, are caulked to prevent an opening, would this meet the intent if the requirement is for all penetrations?
Comment:
The code section seems to indicate every wall where piping passes requires an approved metal collar which is securely attached to structure, including penetrations through non-structural interior walls. Pipe passing through a gypsum board wall would need to have a metal plate securely attached to structure which is the gypsum board.
1. Yes, “in or on buildings where openings have been made in walls” applies to internal and exterior walls.
2. Wall penetrations should be caulked and covered with metal escutcheons (metal collars).
2. Wall penetrations should be caulked and covered with metal escutcheons (metal collars).
UPC 2003 301.1.1
UPC 2006 301.1.1
UPC 2009 301.1.1
UPC 2012 301.1.1
UPC 2015 301.2
Topic: Labeling
1. Does a product with the UPC logo indicate that the product is UPC code compliant? 2. What does the logo "C-IAPMO in a triangle" indicate?
1) A product bearing the UPC logo meets specific manufacturing standards for the product and the intent of all applicable sections of the Uniform Plumbing Code.
2) A classified IAPMO listing indicates that the product meets manufacturing standards, but does not comply with applicable sections of the Uniform Plumbing Code. See 2015/2018 UPC Section 301.2
2) A classified IAPMO listing indicates that the product meets manufacturing standards, but does not comply with applicable sections of the Uniform Plumbing Code. See 2015/2018 UPC Section 301.2
UPC 2015 314.4.1
Topic: Granular Fill
1. What is the definition of the term is "Granular Fill" as it pertains to Section 314.4.1
Section 314.4.1 of the 2015 UPC requires thermoplastic piping to be bedded in not less than 4 inches of granular fill supporting the pipe. Though granular fill is not defined in the Uniform Plumbing Code, guidance for material to bed thermoplastic piping may be found in ASTM D2321-14, the Standard for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications.
UPC 2003 316.1.1
UPC 2006 316.1.1
UPC 2009 316.1.1
UPC 2012 605.4.3
UPC 2015 605.12.3
Topic: Threaded Joints
1. Does the requirement that PVC must be at minimum Schedule 80 to be threaded continue through the section or is it solely referring to manually cutting threads onto PVC pipe?
2. May molded threaded fittings be schedule 40?
2. May molded threaded fittings be schedule 40?
1. No. The minimum wall thickness of PVC pressure water piping, per ASTM D1785, is Schedule 40. Section 605.12.3 of the 2015 Uniform Plumbing Code, gives requirements for both Schedule 40 and 80 PVC pipe. When mechanically threading PVC pipe the minimum wall thickness of the material is Schedule 80. When Schedule 80 PVC is threaded, the pressure rating of the piping must be reduced by 50 percent.
2. Yes. Per Section 605.12.3, molded threaded PVC fittings may be used without a reduction in the pressure rating of the pipe.
2. Yes. Per Section 605.12.3, molded threaded PVC fittings may be used without a reduction in the pressure rating of the pipe.
UPC 2003 313.9
UPC 2006 313.9
UPC 2009 313.9
UPC 2012 312.9
UPC 2015 312.9
Topic: Steel Nail Plates
Does this section apply to metal studs as well? i.e. does a metal stud count as the nail plate or does it need an addition steel plate?
Yes. Section 312.9 of the 2015 Uniform Plumbing Code requires the installation of steel nail plates, with a thickness of no less than 18 ga., to protect plastic or copper pipes that are located within framing members, when the pipe is closer than an 1-1/2” from the face of the stud. According to the Steel Stud Manufacturers Association (SSMA), the wall thickness of metal studs range from 25 ga. to 12 ga. The Authority Having Jurisdiction may not require additional protection of piping, when the wall thickness of the metal stud is equal to or exceeds 18 ga. in thickness.