Sink Drain Pipe Size Code

To be safe install more supports than are required.

Sink drain pipe size code. This is the minimum size to use for building sewer or drain pipe that is connected to the toilet. This pipe size is commonly used for sanitary drainage. Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. Some older sinks may have drains that connect to a 1 1 4 inch tailpiece but most modern drains have a 1 1 2 inch outlet.

The horizontal pipes connect to the trap with a double wye tee which has two y shaped inlets and one outlet. Horizontal drain pipes connecting the sink drains to the trap must have a minimum slope of 1 4 inch per foot toward the trap. Compare the fixture to the minimum sizes of drainage pipe by fixture table. Below our tables 1 and 2 summarize common plumbing code specifications for fixture venting and vent pipe sizes and distances that a plumbing fixture can be located horizontally from the vent stack.

You ll see these distances also in our sketch at left. For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter. According to most codes copper supply pipe must be supported every 6 feet galvanized or black steel pipe every 12 feet pvc or abs drainpipe every 4 feet and cast iron pipe every 5 feet. Bathroom vanity with cooper sink.