Indiana Administrative Code › Title 675 - FIRE PREVENTION AND BUILDING SAFETY COMMISSION › Article 15 - INDUSTRIALIZED BUILDING SYSTEMS › Rule 2 - Indiana Mobile Structures Code › Section 2-39 - Traps

Current through July 10, 2024
Authority: IC
				  22-13-2-13
Affected: IC 22-12; IC 22-13; IC 22-14; IC 22-15
Sec. 39.
(a) Traps
				Required. Each plumbing fixture, except listed toilets shall be separately
				trapped by approved water seal "P" traps. All traps shall be effectively
				vented.
(b) Dual Fixtures. A
				two-compartment sink, two single sinks, two lavatories, or a single sink and a
				single lavatory with waste outlets not more than thirty inches (30") apart and
				in the same room and flood level rims at the same level may be connected to one
				"P" trap and may be considered as a single fixture for the purpose of drainage
				and vent requirements.
(c)
				Prohibited Traps. A trap which depends for its seal upon concealed interior
				partitions shall not be used. Full "S" traps, bell traps, drum traps,
				crown-vented traps, and running traps are prohibited. Fixtures shall not be
				double-trapped.
(d) Material and
				Design. Each trap shall be self-cleaning with a smooth and uniform interior
				waterway. Traps shall be manufactured of cast iron, cast brass, or drawn brass
				tubing of not less than No. 20 Brown and Sharpe gauge, or approved or listed
				material. Union joints for a trap shall be beaded to provide a shoulder for the
				union nut. Each trap shall have the manufacturer's stamped or cast in the body
				of the trap, and each trap shall show the gauge of the tubing.
(e) Trap Seal. Each "P" trap shall have a
				water seal of not less than two inches (2") and not more than four inches (4")
				and shall be set true to its seal.
(f) Size. Traps shall be not less than one
				and one-fourth inches (1 1/4") in diameter. A trap shall not be larger than the
				waste pipe to which it is connected.
(g) Location. Each trap shall be located as
				close to its vent and to its fixture outlet as structural conditions will
				permit.
(h) Length of Tailpiece. The
				vertical distance from a trap to the fixture outlet shall not exceed
				twenty-four inches (24").
(i)
				Installation shall be as follows:
(1) Grade of
				Trap Arm. The piping between a "P" trap and the fixture tee or the vented waste
				line shall be graded one-fourth inch (1/4") per foot towards the vent and in no
				event shall have a slope greater than its diameter. The vent opening at fixture
				tees shall not be below the weir of the "P" trap outlet.
(2) Trap Arm Offset. The piping between the
				"P" trap and vent may change direction or be offset horizontally with the
				equivalent of no more than one hundred eighty degrees (180°).
(3) Concealed Traps. Traps with mechanical
				joints shall be accessible for repair and inspection.
(4) Removability of Traps, Etc. Traps shall
				be designed and installed so the "U" bend is removable without removing the
				strainers from the fixture. Continuous waste and tailpieces which are
				permanently attached to the "U" bend shall also be removable without removing
				the strainer from the fixture.