Bathroom Sink Drain Pipe Size Code

The trap can t have a larger diameter than the waste pipe into which it empties.

Bathroom sink drain pipe size code.

There are minimum clearances and spaces that are determined by local regulators. 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. 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. Sink rough in details.

Vertically both are about 2 to 3 inches above the drain pipe supply lines horizontal. A single trap can service more than one sink but adjacent drains cannot be farther apart than 30 inches. According to the international residential code the maximum vertical distance between the sink drain and the entrance to the p trap is 24 inches. From the center of the drain measure 4 inches to the left and 4 inches to the right.

The bathroom sink s water lines are roughed in 3 inches above the drain. 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. One hole is 4 inches to the right of centerline. However most of the bathroom sinks use 1 inch drain pipe.

Plumbing codes for pipes make sure pipes are up to code by adhering to these guidelines. Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe. The hot line and cold line are spaced 8 inches apart from left to right. A sink represents 1 dfu which requires a 1 1 2 inch drainage pipe and a bathtub and shower each represent 2 dfu.

When combined with a laundry tub the drain pipe must be a minimum of 2 inches in diameter. And toilet requires a drain pipe of 3 inches in diameter unless two toilets are on the same drain and. About 16 to 20 inches above the floor. You ll see these distances also in our sketch at left.

2 separate sinks built next to each other also have to have a spacing of 4 inches or more. Other is 4 inches to left of centerline discharge hole vertical. However the universal plumbing code stipulates. This size is precisely the diameter of the pipe instead of the length.

Measure 21 inches approximately above the finished floor. Consider drain pipe to be the vertical centerline. To be safe install more supports than are required.