815 KAR 20:110. Traps and clean-outs.
RELATES TO: KRS 318.010, 318.130, 318.150
STATUTORY AUTHORITY: KRS 318.130
NECESSITY, FUNCTION, AND CONFORMITY: KRS
318.130 requires the office after review by, the State Plumbing Code Committee,
to promulgate an administrative regulation establishing the Kentucky State
Plumbing Code. This administrative regulation establishes requirements for
traps and clean-outs to prevent harmful gases and odors from entering a
building or home that is served by a plumbing system and identifies the
manufacturer's specification number of acceptable material.
Section 1. Traps, Kind and Minimum Size.
(1) A Trap shall be self-cleaning.
(2) A trap for a bathtub, lavatory, sink
or other similar fixture shall be made of the following:
(a) Tubular brass;
(b) Tubular ABS (acrylonitrile butadiene
styrene) or PVC (polyvinyl chloride) produced and labeled as ASTM F-409;
(c) Cast brass;
(d) Cast iron;
(f) Schedule 40 PVC; or
(g) Schedule 40 ABS.
(3) A tubular or schedule 40 PVC, or
tubular or schedule 40 ABS p-trap shall be either the union-joint or solvent
(4) A tubular brass trap shall be
seventeen (17) gauge.
(5) A tubular brass, tubular PVC, or
tubular ABS trap shall not be installed below the finished floor serving a
(6) A trap shall have a full-bore, smooth
(7) The threads in a cast brass or cast
iron trap shall be tapped out of solid metal.
(8) A lead trap shall be extra heavy.
Section 2. Prohibited Traps. A trap which
depends upon the action of a movable part or concealed interior partition for
its seal shall not be used.
Section 3. Required Traps. (1) A fixture
shall be separately trapped by a water-seal trap placed as near as possible to
the fixture but not to exceed ten (10) inches from the bottom of the fixture to
the dip of the seal.
(2) Waste from a bathtub or other fixture
shall not discharge into a water closet bend.
(3) A fixture shall not be double
Section 4. Water Seal. A fixture trap
shall have a water seal not less than two (2) inches nor more than four (4)
Section 5. Trap Clean-outs. A trap
clean-out shall be optional.
Section 6. Trap Levels and Protection. A
trap shall be set true with respect to its water seal and shall be protected
from frost and evaporation. Trap primers shall be required on all floor drains
and open receptacles in commercial mechanical/boiler rooms and on open receptacles
that receive the discharge from a temperature and pressure relief device
Section 7. Pipe Clean-outs. (1) The
bodies of clean-out ferrules shall be made in a standard pipe size, conforming
in thickness to that of the pipe and fittings and shall not extend less than
one-quarter (1/4) inch above the hubs in which they are placed.
(2) The clean-out cap or plug shall be
yellow-brass, PVC, or ABS not less than one-eighth (1/8) inch thick and shall
have a raised nut or recessed pocket for removal.
Section 8. Required Pipe Clean-outs. (1)
In a building served by a stack over forty-five (45) feet in height, a
clean-out shall be provided at the base of each vertical waste or soil stack.
(2) There shall be at least one (1)
clean-out in the building drain with a full-size branch inside the wall or
outside the building at a point not to exceed two (2) feet from the foundation
wall. This clean-out shall be a two (2) directional fitting or a combination of
sanitary tees or tee wyes to allow cleaning in both directions.
(3) If located outside the building, the
clean-out shall be extended to the finished grade for accessibility.
(4) A clean-out shall be of the same nominal
size as the pipe it serves up to four (4) inches and shall not be less than
four (4) inches for larger pipe.
(5) A clean-out installed on a four (4)
inch sewer shall be a two (2) directional fitting or a combination of sanitary
tees or tee whyes to allow cleaning in both directions.
Section 9. Manholes. An underground
clean-out in a building shall be:
(1) Flush with the floor or wall; or
(2) Accessible by a manhole.
Section 10. Clean-outs (Equivalents). A
floor or wall connection of a fixture shall be regarded as a clean-out, except
such fixtures shall not be regarded as a clean-out where the house drain enters
Section 11. Grease Traps. (1) If a grease
trap is installed, it shall be:
(a) Placed as near to the fixture it
serves as practical; and
(b) Approved by the office.
(2) A grease trap used inside a building
(a) Have a sealed cover; and
(b) Be properly vented.
(3) A grease trap shall be installed for
a restaurant, food service establishment or other business establishment as
required by municipal ordinance.
(4) If a food establishment uses a
private sewage system, a grease trap shall be installed as required by 902 KAR
Section 12. Sand Traps. A sand trap shall
be: (1) Readily accessible; and
(2) Shall serve the purpose intended.
Section 13. Basement Floor Drains. (1) A
basement floor drain shall:
(a) Connect to a trap;
(b) Be readily accessible for cleaning;
(c) Be of sufficient size to serve the
(2) If a drain is subject to back flow or
back pressure, the drain shall be equipped with a backwater valve that complies
with Section 14 of this administrative regulation
Section 14. Back Water Valves. A back
water valve shall be:
(1) Made of noncorrosive material; and
(2) Constructed to insure a positive
mechanical seal except if discharging waste.
Section 15. Residential Utility Room
Floor Drains. A two (2) inch floor drain with an individual waste and vent may
be installed in a residential utility room.
Section 16. Directional Flow Fittings and
Continuous-waste. A kitchen sink unit or fixture with more than one (1) unit
may be connected with a continuous-waste, if a directional flow fitting is
used. Continuous-waste shall be either seventeen (17) gauge tubular brass or
schedule 40 ABS or PVC or tubular ABS or PVC material. (Recodified from 401 KAR
1:080, 7-5-78; Am. 6 Ky.R. 138; eff. 11-7-79; 12 Ky.R. 47; eff. 8-13-85; 16
Ky.R. 1277; eff. 1-25-90; 19 Ky.R. 1195; 1559; eff. 1-4-93; 22 Ky.R. 116; eff.
9-7-95; 26 Ky.R. 217; 616; eff. 9-16-99; 30 Ky.R. 1605; eff. 2-16-2004; 30
Ky.R. 2397; 31 Ky.R. 91; eff. 8-6-04; 33 Ky.R. 3264; 4173; eff. 7-6-07.)