Standard Shower Drain Pipe Size

The usual size for a shower drain trap is 2 inches which is the diameter of the trap.

Standard shower drain pipe size. This is usually sufficiently large enough to keep even the shallowest shower tray from overflowing. Keep in mind that shower drain assemblies are generally made to fit a 2 inch drainpipe not the 1 1 2 inch pipe usually found on tubs. This size is precisely the diameter of the pipe instead of the length.

Also the drain pipe that the trap is connected to must also be 2 inches to comply with the code. A standard rule of thumb is that sewer pipes leading away from a toilet are 3 inches in diameter. Most shower pans or trays are going to be fitted with a two inch pipe.

Rough in plumbing should be calculated for a 1 1 2 inch pipe. Shower and tub drains usually have different drain connection sizes to accommodate the various pipe sizes of your home s plumbing drain system. A vent pipe will need.

What is the standard size pipe for a shower drain then. This size is the minimum size that is allowed which means that you cannot install a trap with a smaller diameter or the trap is not within code. And if you keep a supply of size adaptable shower drains on hand such as the oatey 2 inch or 3 inch pvc shower drain available from supplyhouse the size discrepancy won t slow you down at.

A 2 inch pipe is the recommended size because showers have a low threshold for flooding and a 2 inch pipe helps the water drain faster than does a 1 1 2 inch pipe. A shower tub drain has a 2 inch drain connection while a tub drain frequently has a 1 inch drain connection according to plumbing supply. The drain requires a horizontal drop or angle of fall of one quarter inch per linear foot.

The main sewer pipe leading to the septic tank or public sewer is usually 4 inches. Sewer drains from laundry sinks or washing machines are 2 inches in diameter and those from sinks in the kitchen bathroom or powder room generally use a 1 5 inch pipe. As a result most building codes will require this size drain pipe for every shower.