Plumbing Under The Floor

Supply leaks under the kitchen sink or bath vanity can go unnoticed for a long time since they re usually at the back of the cabinet.

Plumbing under the floor.

Diameter vertical pipe that runs into the basement floor. So before you can do any real planning you have to find that line. The holes must follow a straight line across the floor and must ascend or descend so the pipe will be sloped 1 4 inch per foot. Water can run down the pipes into the floor or subfloor rotting the sink base the floor and the framing.

Take your floor plan and measuring tape and check the location of every pipe. The center of the lav s drain is located 18 approximately above the finished floor. Signs of under sink plumbing trouble. The photo below shows a sink drain hot water line and cold water line at a stud wall on the outer edge of the floor slab.

During new construction the builder installs drain lines and stubs that will connect to future plumbing fixtures before he pours the slab on grade. The plumbing trenches are typically dug at the same time as the slab footings if any. From there the pipe runs under the floor and out to the city sewage system under the street. Here s how to connect the plumbing under your bathroom sink.

If joists are 16 inches on center and pipes run across them at a right angle holes should differ in height by about 3 8 inch. First locate the main stack the large 3 or 4 in. But it may run at an angle rather than straight out to the street. Also notice the drain is centered right in the middle of this 30 inch vanity.

How to cut a concrete floor for new plumbing.