ADOPTS WITH AMENDMENTS:

International Residential Code 2015 (IRC 2015)

Part I — Administrative

Part II — Definitions

Part III — Building Planning and Construction

Part IV — Energy Conservation

Part V — Mechanical

Part VI — Fuel Gas

Part VII — Plumbing

Part VIII — Electrical

Part IX — Referenced Standards

Heads up: There are no amended sections in this chapter.

Chapter 25 Plumbing Administration

AMENDMENT
This section has been amended at the state or city level.
The text of this chapter is extracted from the 2018 edition of the North Carolina Plumbing Code and has been modified where necessary to conform to the scope of application of the North Carolina Residential Code for One- and Two-Family Dwellings. The section numbers appearing in parentheses after each section number are the section numbers of the corresponding text in the North Carolina Plumbing Code.

P2501.1 (101.1) Scope

AMENDMENT
This section has been amended at the state or city level.
The provisions of Chapters 25 through 33 of this code shall apply to the erection, installation, alteration, repairs, relocation, replacement, addition to, use or maintenance of plumbing systems within this jurisdiction. The installation of fuel gas distribution piping and equipment, fuel-gas-fired water heaters and water heater venting systems shall be regulated by the International Fuel Gas Code. Provisions in the appendices shall not apply unless specifically adopted.

P2501.2 (102.1) Application

AMENDMENT
This section has been amended at the state or city level.
In addition to the general administration requirements of Chapter 1, the administrative provisions of this chapter shall also apply to the plumbing requirements of Chapters 25 through 33.

P2501.3 Intent

AMENDMENT
This section has been amended at the state or city level.
The purpose of this code is to establish minimum standards to provide a reasonable level of safety, health, property protection and public welfare by regulating and controlling the design, construction, installation, quality of materials, location, operation and maintenance or use of plumbing equipment and systems.

P2501.4 Severability

AMENDMENT
This section has been amended at the state or city level.
If any section, subsection, sentence, clause or phrase of this code is for any reason held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this code.

P2501.5 Appendices

AMENDMENT
This section has been amended at the state or city level.
Provisions in the appendices shall not apply unless specifically adopted or referenced in this code.

P2501.6 Requirements of Other State Agencies, Occupational Licensing Board or Commissions

AMENDMENT
This section has been amended at the state or city level.
The North Carolina State Building Codes do not include all additional requirements for buildings and structures that may be imposed by other State agencies, occupational licensing boards and commissions. It shall be the responsibility of a permit holder, design professional, contractor or occupational license holder to determine whether any additional requirements exist.

P2502.1 Existing Building Sewers and Building Drains

AMENDMENT
This section has been amended at the state or city level.
Plumbing systems lawfully in existence at the time of the adoption of this code shall be permitted to have their use and maintenance continued if the use, maintenance or repair is in accordance with the original design; and if hazard to life, health or property is not created by such plumbing system.
Additions, alterations, renovations or repairs to any plumbing system shall conform to that required for a new plumbing system without requiring the existing plumbing system to comply with the requirements of this code. Additions, alterations or repairs shall not cause an existing system to become unsafe, insanitary or overloaded.

Minor additions, alterations, renovations and repairs to existing plumbing systems shall be permitted in the same manner and arrangement as in the existing system, provided that such repairs or replacement are not hazardous and are approved.

P2502.3 Change in Occupancy

AMENDMENT
This section has been amended at the state or city level.
It shall be unlawful to make any change in the occupancy of any structure that will subject the structure to any special provision of this code applicable to the new occupancy without approval of the code official. The code official shall certify that such structure meets the intent of the provisions of law governing building construction for the proposed new occupancy and that such change of occupancy does not result in any hazard to the public health, safety or welfare.

P2502.4 Historic Buildings

AMENDMENT
This section has been amended at the state or city level.
The provisions of this code relating to the construction, alteration, repair, enlargement, restoration, relocation or moving of buildings or structures shall not be mandatory for existing buildings or structures identified and classified by the state or local jurisdiction as historic buildings where such buildings or structures are judged by the code official to be safe and in the public interest of health, safety and welfare regarding any proposed construction, alteration, repair, enlargement, restoration, relocation or moving of buildings.

P2502.5 Moved Buildings

AMENDMENT
This section has been amended at the state or city level.
Except as determined by Section P2502.1, plumbing systems that are a part of buildings or structures moved into or within the jurisdiction shall comply with the provisions of this code for new installations.

P2502.6 Referenced Codes and Standards

AMENDMENT
This section has been amended at the state or city level.
The codes and standards referenced in this code shall be those that are listed in Chapter 44 and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections P2502.6.1 and P2502.6.2.

P2502.6.1 Conflicts

AMENDMENT
This section has been amended at the state or city level.
Where conflicts occur between provisions of this code and the referenced standards, the provisions of this code shall apply.

P2502.6.2 Provisions in Referenced Codes and Standards

AMENDMENT
This section has been amended at the state or city level.
Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code shall be the minimum requirements.

P2502.7 Requirements Not Covered by Code

AMENDMENT
This section has been amended at the state or city level.
Any requirements necessary for the strength, stability or proper operation of an existing or proposed plumbing system, or for the public safety, health and general welfare, not specifically covered by this code shall be determined by the code official.

P2502.8 Other Laws

AMENDMENT
This section has been amended at the state or city level.
The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law.

P2502.9 Application of References

AMENDMENT
This section has been amended at the state or city level.
Reference to chapter section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.
New plumbing work and parts of existing systems affected by new work or alterations shall be inspected by the building official to ensure compliance with the requirements of this code.
A plumbing or drainage system, or part thereof, shall not be covered, concealed or put into use until it has been tested, inspected and approved by the building official.

P2503.3 (312.1) Responsibility of Permittee

AMENDMENT
This section has been amended at the state or city level.
The permit holder shall make the applicable tests prescribed in Sections P2503.5 through P2503.8 to determine compliance with the provisions of this code. The permit holder shall give reasonable advance notice to the code official when the plumbing work is ready for tests. The equipment, material, power and labor necessary for the inspection and test shall be furnished by the permit holder and the permit holder shall be responsible for determining that the work will withstand the test pressure prescribed in the following tests. All plumbing system piping shall be tested with either water or by air. After the plumbing fixtures have been set and their traps filled with water, the entire drainage system shall be submitted to final tests. The code official shall require the removal of any cleanouts if necessary to ascertain whether the pressure has reached all parts of the system.

P2503.4 Building Sewer Testing

AMENDMENT
This section has been amended at the state or city level.
Rough-in and finished plumbing installations of drain, waste and vent systems shall be tested in accordance with Sections P2503.5.1 and P2503.5.2.

P2503.5.1 Rough Plumbing

AMENDMENT
This section has been amended at the state or city level.
  1. Water test. A water test shall be applied to the drainage system within the building either in its entirety or in sections. If applied to the entire system, all openings in the piping shall be tightly closed, except the highest opening, and the system shall be filled with water to the point of overflow. If the system is tested in sections, each opening shall be tightly plugged except the highest openings of the section under test, and each section shall be filled with water, but no section shall be tested with less than a 10-foot (3048 mm) head of water. In testing successive sections, at least the upper 10 feet (3048 mm) of the next preceding section shall be tested so that no joint or pipe in the building, except the uppermost 10 feet (3048 mm) of the system, shall have been submitted to a test of less than a 10-foot (3048 mm) head of water. This pressure shall be held for not less than 15 minutes. The system shall then be tight at all points.

    Exception: Rough plumbing testing for one- and two-family dwellings shall be as specified above except the water level shall be a minimum of 3 feet (914 mm) above the highest drainage fitting. Under slab piping systems shall be tested with a minimum of 10 feet (3048 mm) of head.
  2. Drainage and vent air test. An air test shall be made by forcing air into the system until there is a uniform gauge pressure of 5 psi (34.5 kPa) or sufficient to balance a 10-inch (254 mm) column of mercury. This pressure shall be held for a test period of not less than 15 minutes. Any adjustments to the test pressure required because of changes in ambient temperatures or the seating of gaskets shall be made prior to the beginning of the test period.
After the plumbing fixtures have been set and their traps filled with water, their connections shall be tested and proved gas tight or water tight as follows:
  1. Water tightness. Each fixture shall be filled and then drained. Traps and fixture connections shall be proven water tight by visual inspection.
  2. Gas tightness. Where required by the local administrative authority, a final test for gas tightness of the DWV system shall be made by the smoke or peppermint test as follows:
    1. Smoke test. Introduce a pungent, thick smoke into the system. When the smoke appears at vent terminals, such terminals shall be sealed and a pressure equivalent to a 1-inch water column (249 Pa) shall be applied and maintained for a test period of not less than 15 minutes.
    2. Peppermint test. Introduce 2 ounces (59 mL) of oil of peppermint into the system. Add 10 quarts (9464 mL) of hot water and seal the vent terminals. The odor of peppermint shall not be detected at any trap or other point in the system.

P2503.6 Shower Liner Test

AMENDMENT
This section has been amended at the state or city level.
Where shower floors and receptors are made water tight by the application of materials required by Section P2709.2, the completed liner installation shall be tested. The pipe from the shower drain shall be plugged water tight for the test. The floor and receptor area shall be filled with water to a depth of not less than 2 inches (51 mm) measured at the threshold. Where a threshold of not less than 2 inches (51 mm) in height does not exist, a temporary threshold shall be constructed to retain the test water in the lined floor or receptor area to a level not less than 2 inches (51 mm) in depth measured at the threshold. The water shall be retained for a test period of not less than 15 minutes and there shall not be evidence of leakage.

P2503.7 Water-Supply System Testing

AMENDMENT
This section has been amended at the state or city level.
Upon completion of a section of or the entire water distribution system, the system, or portion completed, shall be tested and proved tight under a water or air test of not less than 100 psi (688 kPa). Repaired sections of existing water systems shall be tested at existing operating pressure. This pressure shall be held for not less than 15 minutes. The water utilized for tests shall be obtained from a potable source of supply. The required tests shall be performed in accordance with this section.

P2503.8 Inspection and Testing of Backflow Prevention Devices

AMENDMENT
This section has been amended at the state or city level.

P2503.8.1 Inspections

AMENDMENT
This section has been amended at the state or city level.

P2503.8.2 Testing

AMENDMENT
This section has been amended at the state or city level.

P2503.9 (312.1.1) Test Gauges

AMENDMENT
This section has been amended at the state or city level.
Gauges used for testing shall be as follows:
  1. Tests requiring a pressure of 10 psi or less shall utilize a testing gauge having increments of 0.10 psi (0.69 kPa) or less.
  2. Tests requiring a pressure greater than 10 psi (0.69 kPa) but less than or equal to 100 psi (690 kPa) shall use a testing gauge having increments of 1 psi (6.9 kPa) or less.
  3. Tests requiring a pressure greater than 100 psi (690 kPa) shall use a testing gauge having increments of 2 psi (14 kPa) or less.

Section P2504 Approval

AMENDMENT
This section has been amended at the state or city level.

P2504.1 Modifications

AMENDMENT
This section has been amended at the state or city level.
Where there are practical difficulties involved in carrying out the provisions of this code, the code official shall have the authority to grant modifications for individual cases, upon application of the owner or owner's authorized agent, provided the code official shall first find that special individual reason makes the strict letter of this code impractical and the modification conforms to the intent and purpose of this code and that such modification does not lessen health, life and fire safety requirements. The details of action granting modifications shall be recorded and entered in the files of the plumbing inspection department.

P2504.2 Alternative Materials, Methods and Equipment

AMENDMENT
This section has been amended at the state or city level.
The provisions of this code are not intended to prevent the installation of any material or to prohibit any method of construction not specifically prescribed by this code, provided that any such alternative has been approved. An alternative material or method of construction shall be approved where the code official finds that the proposed alternative material, method or equipment complies with the intent of the provisions of this code and is not less than the equivalent of that prescribed in this code. Where the alternative material, design or method of construction is not approved, the code official shall respond in writing, stating the reasons why the alternative was not approved.

P2504.2.1 Research Reports

AMENDMENT
This section has been amended at the state or city level.
Supporting data, where necessary to assist in the approval of materials or assemblies not specifically provided for in this code, shall consist of valid research reports from approved sources.

P2504.3 Required Testing

AMENDMENT
This section has been amended at the state or city level.
Where there is insufficient evidence of compliance with the provisions of this code, or evidence that a material or method does not conform to the requirements of this code, or in order to substantiate claims for alternative materials or methods, the code official shall have the authority to require tests as evidence of compliance to be made at no expense to the jurisdiction.

P2504.3.1 Test Methods

AMENDMENT
This section has been amended at the state or city level.
Test methods shall be as specified in this code or by other recognized test standards. In the absence of recognized and accepted test methods, the code official shall approve the testing procedures.

P2504.3.2 Testing Agency

AMENDMENT
This section has been amended at the state or city level.
Tests shall be performed by an approved agency.

P2504.3.3 Test Reports

AMENDMENT
This section has been amended at the state or city level.
Reports of tests shall be retained by the code official for the period required for retention of public records.

P2504.4 Alternative Engineered Design

AMENDMENT
This section has been amended at the state or city level.
The design, documentation, inspection, testing and approval of an alternative engineered design plumbing system shall comply with Sections P2504.4.1 through P2504.4.6.

P2504.4.1 Design Criteria

AMENDMENT
This section has been amended at the state or city level.
An alternative engineered design shall conform to the intent of the provisions of this code and shall provide an equivalent level of quality, strength, effectiveness, fire resistance, durability and safety. Material, equipment or components shall be designed and installed in accordance with the manufacturer's installation instructions.

P2504.4.2 Submittal

AMENDMENT
This section has been amended at the state or city level.
The registered design professional shall indicate on the permit application that the plumbing system is an alternative engineered design. The permit and permanent permit records shall indicate that an alternative engineered design was part of the approved installation.

P2504.4.3 Technical Data

AMENDMENT
This section has been amended at the state or city level.
The registered design professional shall submit sufficient technical data to substantiate the proposed alternative engineered design and to prove that the performance meets the intent of this code.

P2504.4.4 Construction Documents

AMENDMENT
This section has been amended at the state or city level.
The registered design professional shall submit to the code official two complete sets of signed and sealed construction documents for the alternative engineered design. The construction documents shall include floor plans and a riser diagram of the work. Where appropriate, the construction documents shall indicate the direction of flow, all pipe sizes, grade of horizontal piping, loading, and location of fixtures and appliances.

P2504.4.5 Design Approval

AMENDMENT
This section has been amended at the state or city level.
Where the code official determines that the alternative engineered design conforms to the intent of this code, the plumbing system shall be approved. If the alternative engineered design is not approved, the code official shall notify the registered design professional in writing, stating the reasons thereof.

P2504.4.6 Inspection and Testing

AMENDMENT
This section has been amended at the state or city level.
The alternative engineered design shall be tested and inspected in accordance with the requirements of Section P2503.

P2504.5 Approved Materials and Equipment

AMENDMENT
This section has been amended at the state or city level.
Materials, equipment and devices approved by the code official shall be constructed and installed in accordance with such approval.

P2504.5.1 Material and Equipment Reuse

AMENDMENT
This section has been amended at the state or city level.
Materials, equipment and devices shall not be reused unless such elements have been reconditioned, tested, placed in good and proper working condition and approved.

Section P2505 Temporary Equipment, Systems and Uses

AMENDMENT
This section has been amended at the state or city level.

P2505.1 General

AMENDMENT
This section has been amended at the state or city level.
The code official is authorized to issue a permit for temporary equipment, systems and uses. Such permits shall be limited as to time of service, but shall not be permitted for more than 180 days. The code official is authorized to grant extensions for demonstrated cause.

P2505.2 Conformance

AMENDMENT
This section has been amended at the state or city level.
Temporary equipment, systems and uses shall conform to the structural strength, fire safety, means of egress, accessibility, light, ventilation and sanitary requirements of this code as necessary to ensure the public health, safety and general welfare.

P2505.3 Temporary Utilities

AMENDMENT
This section has been amended at the state or city level.
The code official is authorized to give permission to temporarily supply utilities before an installation has been fully completed and the final certificate of completion has been issued. The part covered by the temporary certificate shall comply with the requirements specified for temporary lighting, heat or power in the code.

P2505.4 Termination of Approval

AMENDMENT
This section has been amended at the state or city level.
The code official is authorized to terminate such permit for temporary equipment, systems or uses and to order the temporary equipment, systems or uses to be discontinued.

P2505.5 (311.1) Toilet Facilities

AMENDMENT
This section has been amended at the state or city level.
Toilet facilities shall be provided for construction workers in accordance with Table P2505.5 (311.1) and such facilities shall be maintained in a sanitary condition. Construction worker toilet facilities of the nonsewer type shall conform to ANSI Z4.3.

     There shall be at least one facility for every two contiguous construction sites. Such facilities may be portable, enclosed, chemically treated, tank-tight units. Portable toilets shall be enclosed, screened and weatherproofed with internal latches. Temporary toilet facilities need not be provided on site for crews on a job site for no more than one working day and having transportation readily available to toilet facilities.

TABLE P2505.5 (311.1)
TOILET FACILITIES
NUMBER OF EMPLOYEES MINIMUM NUMBER OF FACILITIES
Less than 20 1 toilet
20 to 200 1 toilet & 1 urinal per 40 workers
More than 200 1 toilet & 1 urinal per 50 workers
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