§ 16.12.130. Amendments to the International Plumbing Code.

The following amendments, deletions, or additions to the 2012 Edition of the International Plumbing Code are adopted by reference, as fully as though copied into such Plumbing Code, and thereby made a part of the Plumbing Code.

A.

Sections 103.1 through 104.3 of the 2012 Edition of the International Plumbing Code are hereby amended by deleting Sections 103.1 through 104.3 in their entirety.

B.

Sections 104.6 through 105.1 of the 2012 Edition of the International Plumbing Code are hereby amended by deleting Sections 104.6 through 105.1 in their entirety.

C.

Sections 105.3 through 110.4 of the 2012 Edition of the International Plumbing Code are hereby amended by deleting Sections 105.3 through 1110.4 in their entirety.

D.

Section 201 of the 2012 Edition of the International Plumbing Code is amended by adding a new Section 201.5 and substituting the following:

201.5 Interchangeability with the International Codes. The International Building Code shall be construed to mean the 2012 International Building Code. The International Property Maintenance Code shall be construed to mean the Property Code of the Metropolitan Government. The International Mechanical Code shall be construed to mean the 2012 International Mechanical Code. The International Fuel Gas Code shall be construed to mean the 2012 International Fuel Gas Code. The International Plumbing Code shall be construed to mean the 2012 International Plumbing Code. The International Private Sewage Disposal Code shall be construed to mean the Subsurface Sewage Disposal Systems Code. The ICC Electrical Code shall be construed to mean the 2011 National Electrical Code.

E.

Section 202 of the 2012 Edition of the International Plumbing Code is hereby amended by adding the definition of "Plumbing Official" as follows:

PLUMBING OFFICIAL—shall mean the Director of the Metropolitan Department of Codes Administration, his deputy or duly authorized representative.

F.

Sections 305.4 and 305.4.1 of the International Plumbing Code are hereby amended by deleting Sections 305.4 and 305.4.1 and substituting the following:

305.4. Freezing. Plumbing fixtures, water, soil and waste pipes shall not be installed outside of a building, in attics or crawl spaces, concealed in outside walls, or in any other place subjected to freezing temperature unless adequate provision is made to protect such pipes from freezing by insulation and/or heat or in the case of plumbing fixtures, if the manufacturer provides guidelines for exterior use. Exterior water supply system piping shall be installed not less than eighteen (18) inches below grade.

305.4.1. Sewer depth. Building sewers that connect to private sewage disposal systems shall be a minimum of twelve (12) inches below finished grade at the point of septic connection. Building sewers shall be a minimum of twelve (12) inches below grade. Sewers subject to vehicular traffic require a minimum of twenty-four (24) inches of cover or shall be adequately sleeved or otherwise protected in an approved manner to prevent physical damage to the sewer.

G.

Section 307.2 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 307.2 and substituting the following:

307.2. Cutting, notching and boring in wood members. Joist notching. Notches on the ends of joists shall not exceed one-fourth the actual joist depth. Holes bored in joists shall not be within 2 inches (51 mm) of the top or bottom of the joist, and the diameter of any such hole shall not exceed one third the actual depth of the joist. Notches in the top or bottom of joists shall not exceed one sixth of the actual joist depth and shall not be located in the middle third of the span.

307.2.1. Stud cutting and notching. In exterior walls and bearing partitions, any wood stud is permitted to be cut or notched to a depth not exceeding 25 percent of its actual width. Cutting or notching of studs to a depth not greater than 40 percent of the width of the actual stud width is permitted in nonbearing partitions supporting no loads other than the weight of the partition.

307.2.2. Bored holes. A hole not greater in diameter than 40 percent of the actual stud width is permitted to be bored in any wood stud. Bored holes not greater than 60 percent of the actual width of the stud is permitted in nonbearing partitions or in any wall where each bored stud is doubled, provided not more than two such successive doubled studs are so bored. In no case shall the edge of the bored hole be nearer than 0.625 inch (15.9 mm) to the edge of the stud. Bored holes shall not be located at the same section of stud as a cut of notch.

307.2.3 Cutting, notching and boring holes in structural steel framing. The cutting, notching and boring of holes in structural steel framing members shall be as prescribed by the registered design professional.

307.2.4. Cutting, notching and boring holes in cold-formed steel framing. Flanges and lips of load-bearing cold-formed steel framing members shall not be cut or notched. Holes in webs of load-bearing cold-formed steel framing members shall be permitted along the centerline of the web of the framing member and shall not exceed the dimensional limitations, penetration spacing or minimum hole edge distance as prescribed by the registered design professional. Cutting, notching and boring holes of steel floor/roof decking shall be as prescribed by the registered design professional.

307.2.5. Cutting, notching and boring holes in nonstructural cold-formed steel wall framing. Flanges and lips of nonstructural cold-formed steel wall studs shall not be cut or notched. Holes in webs of nonstructural cold-formed steel wall studs shall be permitted along the centerline of the web of the framing member, shall not exceed 1.5 inches (38 mm) in width or 4 inches (102 mm) in length, and the holes shall not be spaced less than 24 inches (610 mm) center to center from another hole or less than 10 inches (254 mm) from the bearing end.

307.2.6. Cutting, notching and boring holes in nonstructural cold-formed steel wall framing. Flanges and lips of nonstructural cold-formed steel wall studs shall not be cut or notched. Holes in webs of nonstructural cold-formed steel wall studs shall be permitted along the centerline of the web of the framing member, shall not exceed 1.5 inches (38 mm) in width or 4 inches (102 mm) in length, and the holes shall not be spaced less than 24 inches (610 mm) center to center from another hole or less than 10 inches (254 mm) from the bearing end

307.2.7. Cutting, notching and boring holes in nonstructural cold-formed steel wall framing. Flanges and lips of nonstructural cold-formed steel wall studs shall not be cut or notched. Holes in webs of nonstructural cold-formed steel wall studs shall be permitted along the centerline of the web of the framing member, shall not exceed 1.5 inches (38 mm) in width or 4 inches (102 mm) in length, and the holes shall not be spaced less than 24 inches (610 mm) center to center from another hole or less than 10 inches (254 mm) from the bearing end.

H.

Section 312.3 of the International Plumbing Code is hereby amended by deleting Section 312.3 and substituting the following:

312.3 Drainage and vent air test. Plastic piping shall not be tested using air. 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.

Exception: Air testing on plastic pipe shall be permissible when water is not readily available or when the temperature is forecast to be below 32 degrees.

I.

Section 314.2.2 of the International Plumbing Code is hereby amended by deleting Section 314.2.2 and substituting the following:

314.2.2 Drain pipe material and size. Components of the condensate disposal system shall be cast iron, galvanized steel, copper, cross-linked polyethylene, polybutylene, ABS, CPVC, or PVC pipe or tubing. All components shall be selected for the pressure and temperature rating of the installation. Joints and connections shall be made in accordance with the applicable provisions of Chapter 7 relative to material type. Condensate waste and drain line size shall not be less than 3/4-inch (19mm) internal diameter unless permitted by manufacturers installation instructions and shall not decrease in size from the drain pan connection to the place of condensate disposal. Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with Table 314.2.2.

Shower liner test. Where shower floors and receptors are made water-tight by the application of materials required by Section 417.5.2, the completed liner installation shall be tested. The shower liner testing shall be the responsibility of the party installing the shower liner. The pipe from the shower drain shall be plugged water tight for the test. The floor and receptor area shall be filled with potable water to a depth of not less than 2 inches (51 mm) measured at the threshold. Where a threshold of at least 2 inches (51 mm) high 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 (51mm) deep 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.

J.

New Footnotes h and i of Table 403.1 of the 2012 Edition of the International Plumbing Code are hereby added as the following:

(h) For day nurseries, a minimum of one bathtub shall be required.

(i) The minimum number of service sinks shall be 1 per building or 1 per janitor's closet or 1 per tenant space over 7,500 gross square feet.

K.

Section 403.2 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 403.2 and substituting the following:

403.2 Separate facilities. Where plumbing fixtures are required, separate facilities shall be provided for each sex.

EXCEPTIONS:

1.

Separate facilities shall not be required for private facilities.

2.

Separate facilities shall not be required in structures or tenant spaces with a total gross square footages in the following occupancies.

Table 403.2 Occupancies with one bathroom for both sexes
Occupancy	Gross sq. foot
Business	1,500
Education	1,500
Factory	3,000
Mercantile	2,000
Pools	1,000
Restaurants	1,000

 

EXCEPTION: Any business that dispenses gasoline or diesel oil to the public shall have separate facilities for men and women.

L.

Section 403.5 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 403.5 in its entirety.

M.

Chapter 4 is amended by adding a new Section 403.6 and 403.6.1 of the 2012 Edition of the International Building Code as follows:

403.6 Location of employee toilet facilities in occupancies other than assembly or mercantile. Access to toilet facilities in occupancies other than mercantile and assembly occupancies shall be from within the employees' regular working area. Employee facilities shall be either separate facilities or combined employee and public customer facilities. Minimum employee facilities are 1 water closet, 1 lavatory and 1 drinking fountain.

EXCEPTION:

1.

Facilities that are required for employees in storage structures or kiosks, and are located in adjacent structures under the same ownership, lease or control, shall be a maximum travel distance of 500 feet (152 m) from the employees' regular working area.

2.

In education occupancies, the maximum travel distance to bathrooms shall be 300 ft and the facilities shall be located on the same floor level.

403.6.1 Travel distance. The required toilet facilities in occupancies other than assembly or mercantile shall be located not more than one story above or below the employee's regular working area and the path of travel to such facilities shall not exceed a distance of 500 feet (152 m).

EXCEPTION: The location and maximum travel distances to the required employee toilet facilities in factory and industrial occupancies are permitted to exceed that required in 403.4.1, provided the location and maximum travel distances are approved by the code official.

N.

Section 403.7 and 403.7.1 of the 2012 Edition of the International Plumbing Code is hereby amended by adding new Section 403.7 and 403.7.1 as follows:

403.7 Public facilities. Customers, patrons and visitors shall be provided with public toilet facilities in structures and tenant spaces intended for public utilization. Public toilet facilities shall be located not more than one story above or below the space required to be provided with public toilet facilities and the path of travel to such facilities shall not exceed a distance of 500 feet (152 m). The path of travel to the public facilities shall not pass through a stock room or similar room.

403.7.1 Covered malls. In covered mall buildings, the path of travel to required toilet facilities shall not exceed a distance of 300 feet (91 440 mm). The required facilities shall be based on total gross square footage, and facilities shall be installed in each individual store or in central toilet areas located in accordance with this section. Restaurants other than food tenants in the food court shall have the required facilities installed within their tenant space. The maximum travel distance to the central toilet facilities in covered mall buildings shall be measured from the main entrance of any store or tenant space.

O.

Section 406.1 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 406.1 in its entirety.

P.

Section 503.1 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 503.1 and substituting the following:

503.1 Cold water line valve. The cold water branch line from the main water supply line to each hot water storage tank or water heater shall be provided with a valve, located within 3 feet of the equipment and serving only the hot water storage tank or water heater. The valve shall not interfere or cause a disruption of the cold water supply to the remainder of the cold water system. The valve shall be provided with access on the same floor level as the water heater served.

Q.

Section 504.7.1 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 504.7.1 and substituting the following:

R.

Section 604.9 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 604.9 and substituting the following:

604.9 Water hammer. The flow velocity of the water distribution system shall be controlled to reduce the possibility of water hammer. A water-hammer arrestor shall be installed where quick-closing valves are utilized. Water hammer-arrestors shall be installed as per the plan design but at a minimum at all washing machines, dishwashers and ice makers. Water-hammer arrestors shall be installed in accordance with the manufacturer's instructions. Water-hammer arrestors shall conform to ASSE 1010.

S.

Section 607.2 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 607.2 and substituting the following:

607.2 Hot or tempered water supply to fixtures. The developed length of hot or tempered water piping, from the source of hot water to the fixtures that require hot or tempered water, shall not exceed 100 feet. Recirculating system piping and heat-traced piping shall be considered to be sources of hot or tempered water.

T.

Section 606.1 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 606.1 and substituting the following:

606.1 Location of full-open valves. Full-open valves shall be installed in the following locations: The main shut off valve is required to be installed in the habitable or occupied portion of the structure.

1.

On the building water service pipe from the public water supply near the curb.

2.

On the water distribution supply pipe at the entrance into the structure.

3.

On all branches.

4.

On the base of every water riser pipe in occupancies other than multiple family residential occupancies that are two stories or less in height.

5.

On the top of every water down-feed pipe in occupancies other than one-and two-family residential occupancies.

6.

On the entrance to every water supply pipe to a dwelling unit, except where supplying a single fixture equipped with individual stops.

7.

On the water supply pipe to a gravity or pressurized water tank.

8.

On the water supply pipe to every water heater.

9.

On the water supply pipe to each appliance or mechanical equipment.

U.

Section 608.16.4 Exception 2 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 608.16.4 exception 2 in its entirety.

V.

Footnotes Table 710.1(1) of the 2012 Edition of the International Plumbing Code are hereby amended by adding footnote b to Table 710.1(1):

(b) There shall be 3 water closets maximum on any 3 inch drain line.

W.

Section 903.1 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Section 903.1 and substituting the following:

903.1 Stack required. Every building in which plumbing is installed shall have at least one 3 inch main vent stack. Such stack shall run undiminished in size and as directly as possible from the building drain through to the open air or to a vent header that extends to the open air. The stack shall terminate not less than 12 inches above the roof

X.

Section 1002.4 of the 2012 Edition of the International Plumbing Code is hereby amended by adding a sentence to the end of Section 1002.4 as follows:

"Trap seals conforming to ASSE 1072 are also approved."

Y.

Chapter 12 of the 2012 Edition of the International Plumbing Code is hereby amended by deleting Chapter 12 in its entirety.

Z.

The 2012 Edition of the International Plumbing Code is hereby amended by adding Appendix H as follows:

APPENDIX H REGULATIONS GOVERNING PRIVATE SEWAGE DISPOSAL SYSTEMS

The following regulations shall apply to the manufacture, sale, installation, repair, alteration, extension and relocation of all private sewage disposal systems under the jurisdiction of the Metropolitan Government of Nashville and Davidson County.

H101. APPROVED AND LIMITATIONS.

H101.1 ALLOWABLE USE. Septic tanks and soil absorption systems and other similar facilities may be constructed where no public sewerage system is available or is likely to become available within a reasonable time.

H101.2 PUBLIC SEWER CONNECTION. Private domestic sewage treatment and disposal systems shall be discontinued and adequately abandoned when public sewers become available to the building served.

H101.3 PERMISSION TO CONSTRUCT. No plumbing permit shall be issued for the installation of any septic tank or disposal field or for any individual or private sewage disposal system until satisfactory evidence of approval of such system, by the Metropolitan Department of Health, has been submitted to the Department of Codes Administration. On approved and recorded subdivisions, such notification consists of a letter to Codes Administration from the Health Department which covers each subdivided lot.

H101.4 PLANS AND SPECIFICATIONS.

H101.4.1 All manufacturers or distributors of mechanical sewage disposal units, filters, precast septic tanks or any other method of sewage disposal must submit detailed plans and specifications to the Director of Health of the Metropolitan Health Department, and receive approval prior to the manufacture and sale or installation of the product with the Metropolitan area of Nashville and Davidson County.

H101.4.2 Commercial and public buildings, such as but not limited to theaters, food dispensers, assembly halls, schools, churches, apartment buildings, motels, factories, mobile home parks, camp grounds and parks proposed to be constructed in an unsewered area, must submit detailed plans and specifications for the proposed sewage disposal system to the Sanitary Engineering Division of the Metropolitan Health Department for approval prior to any construction.

H101.4.3 The plans and specifications shall be submitted in triplicate and shall include the following:

H101.4.3.1 Detailed plan of the proposed septic tank or treatment tank and effluent disposal system showing building location, and with the distance labeled from building served to system, from system to well, lot line, lake, stream or other watercourse.

H101.4.3.2 The ground slope should be indicated and information submitted relative to the expected use and occupancy of the building to be served.

H101.4.3.3 Provide soil borings and percolation test data.

H101.4.3.4 There shall be maintained at the project site one set of plans bearing the Health Department's stamp of approval.

(Ord. BL2015-1145 § 11, 2015; Ord. BL2007-1390 § 14, 2007; Ord. BL2002-1142 § 17, 2002; Ord. 98-1445 §§ 48—50, 1998; Ord. 96-562 § 35, 1996; Ord. 95-1487 §§ 30—51, 1995; Ord. 92-118 §§ 6—8, 1992; Ord. 89-1001 § 1 (part), 1989; Ord. 89-828 §§ 1, 2, 1989; prior code § 33-1-28 (a) (part))