Bathroom Sink Drain Pipe Size Code

A single trap can service more than one sink but adjacent drains cannot be farther apart than 30 inches.

Bathroom sink drain pipe size code.

Sink rough in details. From the center of the drain measure 4 inches to the left and 4 inches to the right. All bathroom sinks should be 4 inches from the side walls at minimum and should also have at least 21 inches of front clearance. 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 trap can t have a larger diameter than the waste pipe into which it empties. The bathroom sink s water lines are roughed in 3 inches above the drain. Consider drain pipe to be the vertical centerline. Plumbing codes for pipes make sure pipes are up to code by adhering to these guidelines.

There are minimum clearances and spaces that are determined by local regulators. A sink represents 1 dfu which requires a 1 1 2 inch drainage pipe and a bathtub and shower each represent 2 dfu. 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 hot line and cold line are spaced 8 inches apart from left to right.

This size is precisely the diameter of the pipe instead of the length. About 16 to 20 inches above the floor. Vertically both are about 2 to 3 inches above the drain pipe supply lines horizontal. One hole is 4 inches to the right of centerline.

You ll see these distances also in our sketch at left. Measure 21 inches approximately above the finished floor. Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe.

2 separate sinks built next to each other also have to have a spacing of 4 inches or more. However most of the bathroom sinks use 1 inch drain pipe. However the universal plumbing code stipulates. 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.

To be safe install more supports than are required. Other is 4 inches to left of centerline discharge hole vertical. And toilet requires a drain pipe of 3 inches in diameter unless two toilets are on the same drain and.