Floor Drain Minimum Size

The drainpipes that connect to floor drains must have a minimum vent size of 1 1 2 inches.

Floor drain minimum size.

For example a 2 inch drain requires 3 14 inches of immediate connecting pipe. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Because the floor drain connects to the sewer system sewer gas can drift up the pipe and enter your home through the drain. This pipe size is commonly used for sanitary drainage.

The laundry room floor drain is one of those things that you notice but you don t pay much attention to until there is a problem. The laundry room floor drain is typically a 4 inch round diameter hole located at the lowest point of the room which is usually installed in the basement floor during the construction phase of a build. The maximum number of drainage fixture units connected to a given size of horizontal branch or vertical soil or waste stack shall be determined using table. The maximum number of drainage fixture units connected to a given size of building sewer building drain or horizontal branch of the building drain shall be determined using table 710 1 1.

If you have questions please call our drain wizard at 800 635 0384. The last size is 4 inch drain pipe that can be connected to 160 units in horizontal stack and 240 units in vertical stack. As a result most building codes will require this size drain pipe for every shower. That said we put together the following tables to serve as general guides for estimating a pipe s water flow capacity.

Water flow gpm gph based on pipe size and inside outside diameters. This is the minimum size to use for building sewer or drain pipe that is connected to the toilet. They range in size from 2 to 6 inches and are dependant upon the size of the hole in the floor shower or tub as well as the pipes that fit into the space underneath it. Pipes in your home need to be vented.

This is usually sufficiently large enough to keep even the shallowest shower tray from overflowing. Some states and cities only require a 1 5 inch. Commercial plumbing drains are measured in inches. Bathroom vanity with cooper sink.

Keep in mind that the local building codes and shower drain size code for your area may be slightly different.