How to Install Rough in Plumbing for a Bathroom, Part 1 How to Install Rough in Plumbing for a Bathroom, Part 1

What You'll Need
Tape Measure
PVC Pipe
ABS Adapters
Copper Pipe
Bathroom Fixtures

One of the tasks involved in building a new bathroom is to do some rough plumbing. There are several different local codes that you must adhere to when renovating or building a new bathroom. This is why rough plumbing is so important. Take your time to ensure that your plumbing will not only pass the building code inspection, but also work efficiently. Part 1 of this series will cover the planning and materials you need for this project.

Step 1: Draw Bathroom Plan

There are many different variables that you must take into account as you start this project. Some things to consider include the placement of the fixtures, the placement of the pipes, and where the vent pipe will be positioned. The best way to do this is to take some time to make a rough drawing of your bathroom and where the fixtures will go, as well as the route for all of the water supply and sewer lines. 

Step 2: Mark Positions on Floor and Wall

In a typical bathroom you will need to have pipes for water supply, and sewage, for the toilet, tub and shower, and vanity. This means there are going to be three different locations for water supply pipes and waste water. Use your tape measure and mark these locations on the wall. They do not have to be pinpoint accurate at this time. Use some chalk, or a marker, to locate the positions.,

Step 3: Make Fine Tuned Adjustments

Because there are several areas where you will need to do your plumbing, make sure that the plan coincides with the actual bathroom. Start at the main water supply and map out each of the pipes that you will use for each fixture. Measure for each of the pipes and write down everything so you can cut the pipes to size. 

Step 4: Drill Holes for Pipes

Once you know where all of your pipes are going to go in the rough plumbing, you will need to drill holes in the 2 by 4 studs in order to run the pipes through the wall. You will need to use a cordless drill with a 1-inch hole saw. Make sure that the drill is kept straight and that the hole is in the center of the stud. The water supply pipe generally go through the studs, while the waste water, and vent pipes, will travel through joists in the floor and subflooring. 

Step 5: Install Water Pipes

Starting with the fixture that is farthest away, start laying out the water supply tubes. Use copper piping for this part of the project. Make sure that they lay flat along the sides of the floor joists and studs until you go through them. This rough plumbing is done with simple connections, without actually using a solder or pipe glue. This is the time to make sure all of the pipes fit and are going to be installed correctly for each of the fixtures. 

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