Floor Drain Minimum Size

Bathroom vanity with cooper sink.

Floor drain minimum size.

This is usually sufficiently large enough to keep even the shallowest shower tray from overflowing. That said we put together the following tables to serve as general guides for estimating a pipe s water flow capacity. Some states and cities only require a 1 5 inch. 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.

The last size is 4 inch drain pipe that can be connected to 160 units in horizontal stack and 240 units in vertical stack. Pipes in your home need to be vented. 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. For example a 2 inch drain requires 3 14 inches of immediate connecting pipe.

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. Because the floor drain connects to the sewer system sewer gas can drift up the pipe and enter your home through the drain. This is the minimum size to use for building sewer or drain pipe that is connected to the toilet. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

As a result most building codes will require this size drain pipe for every shower. This pipe size is commonly used for sanitary drainage. Floor drains or area drains when used to drain exterior areas should have an open area equal to twice the transverse area of the connecting pipe table 1 see roof drain section for rainfall and sizing data table 1 recommended grate free areas for various outlet pipe sizes nominal pipe size transverse area of pipe sq in minimum. 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 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 international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Floor drains must meet other standards in order to be up to code. Commercial plumbing drains are measured in inches.

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