How Far Should Bathroom Drain Pipe Go Into Wall?


If you are referring to the rough plumbing, it should be flush with the finished wall. If it has to stick out of the wall, no more 1 inch, or enough pipe to receive the the next fitting. The drain stub-out extends from a fitting — usually a sanitary tee — to a point 3 or 4 inches beyond the wall.


Check that the center of the closet bend hole is the correct distance from the wall (in most cases, 12-1/2 inches from the framing to allow for 1/2-inch drywall). Check that the pipe slopes 1/8 to 1/4 inch down to the fitting. (If necessary, you can trim the top of the closet bend after the flooring has been replaced.)


Frequently Asked Questions

When installing a drain line how many inches should the drain line be installed off the floor?

Your plumbing codes might require the horizontal revent lines be as high as 54 inches above the finished floor, or at least 6 inches above the fixture flood level (the point where water will start to spill out).

What is the standard height for a sink drain?

The rough-in height for a sink drain is 20”-24” and depends on the counter, vanity, or trap. Bathroom sinks can have an 18” rough-in but should not exceed 24”. You can adjust sink drain height and depth during the installation process. Let's explore the rough-in height for sink drains and why it matters.

What's the correct distance between two drain pipes?

As with the term "on-center," which is used for construction, the term "centerline" is an imaginary vertical line drawn through a key reference point (usually the drain pipe). For example, if two pipes are specified to be 10 inches apart, you measure 10 inches between the centers of the pipes, not 10 inches between the edges of the pipes.

How big of a drop do you need for a drain pipe?

It might be possible to simplify supply runs by moving a vent pipe over a few inches. If you must run drainpipes across a floor, carefully calculate the amount of vertical space available; you must slope the drainpipe at 1/8 to 1/4 inch drop per foot.

Add a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.