Bathroom Sink Drain Pipe Size Code

Plumbing codes for pipes make sure pipes are up to code by adhering to these guidelines.

Bathroom sink drain pipe size code.

From the center of the drain measure 4 inches to the left and 4 inches to the right. When combined with a laundry tub the drain pipe must be a minimum of 2 inches in diameter. All bathroom sinks should be 4 inches from the side walls at minimum and should also have at least 21 inches of front clearance. However most of the bathroom sinks use 1 inch drain pipe.

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. The bathroom sink s water lines are roughed in 3 inches above the drain. 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. The trap can t have a larger diameter than the waste pipe into which it empties.

2 separate sinks built next to each other also have to have a spacing of 4 inches or more. Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe. And toilet requires a drain pipe of 3 inches in diameter unless two toilets are on the same drain and. This size is precisely the diameter of the pipe instead of the length.

You ll see these distances also in our sketch at left. A sink represents 1 dfu which requires a 1 1 2 inch drainage pipe and a bathtub and shower each represent 2 dfu. Vertically both are about 2 to 3 inches above the drain pipe supply lines horizontal. Other is 4 inches to left of centerline discharge hole vertical.

Measure 21 inches approximately above the finished floor. The hot line and cold line are spaced 8 inches apart from left to right. However the universal plumbing code stipulates. A drainage pipe that handles all three fixtures must be 2 inches in diameter since a 1 1 2 inch pipe can handle a maximum of only 4 dfu.

The trap and tailpiece should have the same diameter which is generally 1 1 2 inches since the code specifies that diameter for the sink drain outlet. Consider drain pipe to be the vertical centerline. One hole is 4 inches to the right of centerline. According to the international residential code the maximum vertical distance between the sink drain and the entrance to the p trap is 24 inches.

Sink rough in details. Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. To be safe install more supports than are required.