Drain and Sewer Pipe Cleanouts

Cleanout Locations and Spacing
1. Install a clean-out in every horizontal drain pipe so that the distance between clean-outs is not more than (≤) 100 feet, measured along the length of the pipe. Install at least (≥) one clean-out for every horizontal drain pipe regardless of length of the drain pipe. This provision applies to the building drain, building sewer, and horizontal branch drains.
2. Install a clean-out near the junction of the building drain and the building sewer. You may install this clean-out inside or outside the building. Make this clean out accessible at the lowest floor level inside or at grade level outside. You may install this clean-out in at least (≥) a 3 inch diameter soil stack if the clean-out fitting is not more than (≤) 10 feet from the building drain connection to the building sewer. Measure the 10 feet along the developed length of the pipe from the clean-out
fitting to the building drain and sewer junction.
3. Install a clean-out near the base of every vertical waste or soil stack. You may install this clean-out in the vertical stack or in the horizontal drain pipe.
4. Install a clean-out at every change of pipe direction of more than (>) 45 degrees when the direction change uses one fitting. You do not need to install a clean-out if the change in pipe direction uses two or more fittings. When multiple direction changes occur in one pipe run, only one clean-out is required spaced not more than (≤) 40 feet apart. This provision applies to the building drain, building sewer, and horizontal branch drains. Example: A direction change using one 1/4 bend fitting requires a clean-out, but a change in direction using two 1/8 bend fittings does not require a clean-out.

Cleanout Substitutes
1. You may use a fixture trap (such as a sink) or a fixture with an integral trap (such as a toilet) as a clean-out if the:
(a) trap or fixture is readily removable without disturbing concealed piping; and
(b) clean-out is accessible; and
(c) fixture trap or fixture provides the required clean-out size for all pipes that will be cleaned from the clean-out substitute.
2. Note that drain pipes 3 inches and larger require a clean-out size that is larger than most fixture drains. You cannot use a 1 ½ or 2 inches fixture drain as a clean-out for pipes 3 inches and larger.

Cleanout Size
1. Install a clean-out that is the same size as the pipe served by the clean-out.
2. You may use a 1 ½ inch P trap with slip joints as the clean-out for pipes up to 2 inches and you may use a 2 inch P trap with slip joints as the clean-out for pipes up to 2 ½ inches.
3. You may use a 2 inch stack clean-out to serve a pipe up to 2 ½ inches and you may use a 2 ½ inch stack clean-out to serve a pipe up to 3 inches.
4 You may install different size clean-outs in cast-iron drainage pipes because these pipes have different cap sizes.

Cleanout Accessibility
1. Provide at least (≥) 18 inches in front of clean-outs (≥) 3 inches and larger and at least (≥) 12 inches in front of clean-outs smaller than (<) 3 inches.
2. Provide enough access around concealed clean-outs to remove the clean-out plug and use the drain cleaning appliances.
3. Do not conceal clean-outs with permanent finishing materials.
4. Extend underground clean-outs to or above finished grade. Do not extend clean-outs above surfaces where they may become trip hazards or where they may be damaged by traffic.

Cleanout Plugs
1. Install brass or plastic plugs in clean-out fittings.
2. Make clean-outs gas and liquid tight.

Cleanout Direction
1. Install clean-outs so that they open toward the direction of the drainage fl ow.

Cleanout Fixture Connections
1. Do not connect other pipes or fixtures to an existing clean-out unless the connection is approved by the local building official and you install an alternate clean-out. Example: do not remove a clean-out plug and use the clean-out opening as the drain for a laundry sink.