Page 694 - 2018_IRC

SANITARY DRAINAGE

P3005.1.1 Horizontal to vertical (multiple connection P3005.2 Cleanouts required. Cleanouts shall be provided
fittings). Double fittings such as double sanitary tees and for drainage piping in accordance with Sections P3005.2.1
tee-wyes or approved multiple connection fittings and through P3005.2.11.
back-to-back fixture arrangements that connect two or more P3005.2.1 Horizontal drains and building drains. Hori-
branches at the same level shall be permitted as long as zontal drainage pipes in buildings shall have cleanouts
directly opposing connections are the same size and the dis- located at intervals of not more than 100 feet (30 480 mm).
charge into directly opposing connections is from similar Building drains shall have cleanouts located at intervals of
fixture types or fixture groups. Double sanitary tee patterns not more than 100 feet (30 480 mm) except where man-
shall not receive the discharge of back-to-back water closets holes are used instead of cleanouts, the manholes shall be
and fixtures or appliances with pumping action discharge. located at intervals of not more than 400 feet (122 m). The
Exception: Back-to-back water closet connections to interval length shall be measured from the cleanout or man-
double sanitary tee patterns shall be permitted where hole opening, along the developed length of the piping to
the horizontal developed length between the outlet of the next drainage fitting providing access for cleaning, the
the water closet and the connection to the double sani- end of the horizontal drain or the end of the building drain.
tary tee is 18 inches (457 mm) or greater. Exception: Horizontal fixture drain piping serving a
P3005.1.2 Heel- or side-inlet quarter bends, drainage. nonremovable trap shall not be required to have a clea-
Heel-inlet quarter bends shall be an acceptable means of nout for the section of piping between the trap and the
connection, except where the quarter bends serves a water vent connection for such trap.
closet. A low-heel inlet shall not be used as a wet-vented P3005.2.2 Building sewers. Building sewers smaller than
connection. Side-inlet quarter bends shall be an acceptable 8 inches (203 mm) shall have cleanouts located at intervals
means of connection for both drainage, wet venting and of not more than 100 feet (30 480 mm). Building sewers 8
stack venting arrangements. inches (203 mm) and larger shall have a manhole located
P3005.1.3 Heel- or side-inlet quarter bends, venting. not more than 200 feet (60 960 mm) from the junction of
Heel-inlet or side-inlet quarter bends, or any arrangement the building drain and building sewer and at intervals of
of pipe and fittings producing a similar effect, shall be not more than 400 feet (122 m). The interval length shall
acceptable as a dry vent where the inlet is placed in a verti- be measured from the cleanout or manhole opening, along
cal position. The inlet is permitted to be placed in a hori- the developed length of the piping to the next drainage fit-
zontal position only where the entire fitting is part of a dry ting providing access for cleaning, a manhole or the end of
vent arrangement. the building sewer.
P3005.1.4 Water closet connection between flange and P3005.2.3 Building drain and building sewer junction.
pipe. One-quarter bends 3 inches (76 mm) in diameter The junction of the building drain and the building sewer
shall be acceptable for water closet or similar connections, shall be served by a cleanout that is located at the junction
provided that a 4-inch by 3-inch (102 mm by 76 mm) or within 10 feet (3048 mm) developed length of piping
flange is installed to receive the closet fixture horn. Alter- upstream of the junction. For the requirements of this sec-
nately, a 4-inch by 3-inch (102 mm by 76 mm) elbow shall tion, removal of a water closet shall not be required to pro-
be acceptable with a 4-inch (102 mm) flange. vide cleanout access.
P3005.1.5 Provisions for future fixtures. Where drain- P3005.2.4 Changes of direction. Where a horizontal
age has been roughed-in for future fixtures, the drainage drainage pipe, a building drain or a building sewer has a
unit values of the future fixtures shall be considered in change of horizontal direction greater than 45 degrees (0.79
determining the required drain sizes. Such future installa- rad), a cleanout shall be installed at the change of direction.
tions shall be terminated with an accessible permanent Where more than one change of horizontal direction greater
plug or cap fitting. than 45 degrees (0.79 rad) occurs within 40 feet (12 192
P3005.1.6 Drainage piping size reduction in the direc- mm) of developed length of piping, the cleanout installed
tion of flow. The size of the drainage piping shall not be for the first change of direction shall serve as the cleanout
reduced in the direction of the flow. The following shall for all changes in direction within that 40 feet (12 192 mm)
not be considered a reduction in size in the direction of of developed length of piping.
flow: P3005.2.5 Cleanout size. Cleanouts shall be the same size
1. A 4-inch by 3-inch (102 mm by 76 mm) water closet as the piping served by the cleanout, except cleanouts for
flange. piping larger than 4 inches (102 mm) need not be larger
than 4 inches (102 mm).
2. A water closet bend fitting having a 4-inch (102
mm) inlet and a 3-inch (76 mm) outlet provided that Exceptions:
the 4-inch leg of the fitting is upright and below, but 1. A removable P-trap with slip- or ground-joint
not necessarily directly connected to, the water connections can serve as a cleanout for drain pip-
closet flange. ing that is one size larger than the P-trap size.
3. An offset closet flange. 2. Cleanouts located on stacks can be one size
smaller than the stack size.

2018 INTERNATIONAL RESIDENTIAL CODE ® 669
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