Page 695 - 2018_IRC

SANITARY DRAINAGE

3. The size of cleanouts for cast-iron piping can be P3005.2.10.1 Cleanout plug trim covers. Trim covers
in accordance with the referenced standards for and access doors for cleanout plugs shall be designed
cast iron fittings as indicated in Table P3002.3. for such purposes. Trim cover fasteners that thread into
P3005.2.6 Cleanout plugs. Cleanout plugs shall be cop- cleanout plugs shall be corrosion resistant. Cleanout
per alloy, plastic or other approved materials. Cleanout plugs shall not be covered with mortar, plaster or any
plugs for borosilicate glass piping systems shall be of other permanent material.
borosilicate glass. Copper-alloy cleanout plugs shall con- P3005.2.10.2 Floor cleanout assemblies. Where it is
form to ASTM A74 and shall be limited for use only on necessary to protect a cleanout plug from the loads of
metallic piping systems. Plastic cleanout plugs shall con- vehicular traffic, cleanout assemblies in accordance
form to the referenced standards for plastic pipe fittings as with ASME A112.36.2M shall be installed.
indicated in Table P3002.3. Cleanout plugs shall have a P3005.2.11 Prohibited use. The use of a threaded clea-
raised square head, a countersunk square head or a coun- nout opening to add a fixture or extend piping shall be pro-
tersunk slot head. Where a cleanout plug will have a trim hibited except where another cleanout of equal size is
cover screw installed into the plug, the plug shall be manu- installed with the required access and clearance.
factured with a blind end threaded hole for such purpose.
P3005.3 Horizontal drainage piping slope. Horizontal
P3005.2.7 Manholes. Manholes and manhole covers shall drainage piping shall be installed in uniform alignment at uni-
be of an approved type. Manholes located inside of a build- form slopes not less than / unit vertical in 12 units horizon-
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ing shall have gas-tight covers that require tools for tal (2-percent slope) for 2 / inch (64 mm) diameter and less,
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removal. and not less than / unit vertical in 12 units horizontal (1-per-
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P3005.2.8 Installation arrangement. The installation cent slope) for diameters of 3 inches (76 mm) or more.
arrangement of a cleanout shall enable cleaning of drain- P3005.4 Drain pipe sizing. Drain pipes shall be sized accord-
age piping only in the direction of drainage flow. ing to drainage fixture unit (d.f.u.) loads. The size of the drain-
Exceptions: age piping shall not be reduced in size in the direction of flow.
1. Test tees serving as cleanouts. The following general procedure is permitted to be used:
1. Draw an isometric layout or riser diagram denoting fix-
2. A two-way cleanout installation that is approved
for meeting the requirements of Section tures on the layout.
P3005.2.3. 2. Assign d.f.u. values to each fixture group plus individ-
P3005.2.9 Required clearance. Cleanouts for 6-inch (153 ual fixtures using Table P3004.1.
mm) and smaller piping shall be provided with a clearance 3. Starting with the top floor or most remote fixtures,
of not less than 18 inches (457 mm) from, and perpendicu- work downstream toward the building drain accumu-
lar to, the face of the opening to any obstruction. Clea- lating d.f.u. values for fixture groups plus individual
nouts for 8-inch (203 mm) and larger piping shall be fixtures for each branch. Where multiple bath groups
provided with a clearance of not less than 36 inches (914 are being added, use the reduced d.f.u. values in Table
mm) from, and perpendicular to, the face of the opening to P3004.1, which take into account probability factors of
any obstruction. simultaneous use.
P3005.2.10 Cleanout access. Required cleanouts shall not 4. Size branches and stacks by equating the assigned d.f.u.
be installed in concealed locations. For the purposes of this values to pipe sizes shown in Table P3005.4.1.
section, concealed locations include, but are not limited to,
the inside of plenums, within walls, within floor/ceiling 5. Determine the pipe diameter and slope of the building
drain and building sewer based on the accumulated
assemblies, below grade and in crawl spaces where the d.f.u. values, using Table P3005.4.2.
height from the crawl space floor to the nearest obstruction
along the path from the crawl space opening to the cleanout P3005.4.1 Branch and stack sizing. Branches and stacks
location is less than 24 inches (610 mm). Cleanouts with shall be sized in accordance with Table P3005.4.1. Below
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openings at a finished wall shall have the face of the open- grade drain pipes shall be not less than 1 / inches (38 mm)
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ing located within 1 / inches (38 mm) of the finished wall in diameter. Drain stacks shall be not smaller than the larg-
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surface. Cleanouts located below grade shall be extended to est horizontal branch connected.
grade level so that the top of the cleanout plug is at or above Exceptions:
grade. A cleanout installed in a floor or walkway that will 1. A 4-inch by 3-inch (102 mm by 76 mm) closet
not have a trim cover installed shall have a counter-sunk bend or flange.
plug installed so the top surface of the plug is flush with the
finished surface of the floor or walkway. 2. A 4-inch (102 mm) closet bend connected to a 3-
inch (76 mm) stack tee shall not be prohibited.

670 2018 INTERNATIONAL RESIDENTIAL CODE ®
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