How To Rough-In Plumbing: Tips And Basic Information



Plumbing 101

Installing new plumbing pipes and fixtures requires some preparation. Your first step should be to rough in new fixtures by figuring out their location and how they will connect to plumbing pipes. Find out how to rough-in plumbing so you can do repairs yourself or install new fixtures.

How to Rought-In Plumbing

You should be familiar with the main components of your plumbing system before getting started with repairs or installation. The rough-in requirements will vary depending on the kind of pipes you are working with. Keep in mind that the measurements between pipes and floors correspond to the finished floor height and not to the subfloor height.

The wastewater system of your home will typically use larger pipes. These pipes need to be angled down so wastewater can properly drain. You need to have at least a 1/4? drop per foot on a pipe that runs horizontally.Your wastewater system will be connected to smaller drain pipes for all your fixtures, including your sinks, toilet, bathtub, or shower. The main component of your wastewater system is the drain stack, which is connected to the main sewer drain at the bottom and a vent at the top.

In addition to this main vent stack, each fixture should have a P-trap to prevent sewer gas from backing up. Toilets already have a built-in P-trap, but you will need to account for a P-trap when roughing in other fixtures such as sinks, bathtubs, and showers.

Water supply pipes are typically installed after the waste pipes because they are thinner. After the main water pipe or trunk line enters your home, it will split in two. One of these pipes is the cold water supply for your different fixtures, and the other pipe will bring cold water to your water heater.

Check your local building code to find out more about plumbing and rough-in requirements. Some requirements are standards, but you might need to follow local ordinances for your pipe layout, pipe dimensions, or venting requirements.

When learning how to rough-in plumbing, there are a few steps to take before installing new plumbing pipes or fixtures:

Figure out where the new fixtures will go. Take existing pipes and clearance into consideration.If you need to install new pipes, figure out where they will connect to the main water supply lines or wastewater system.If you need to install new pipes, measure everything carefully and submit a diagram of the changes to your local building department if needed.

How To Rough-In Plumbing

Sinks should be installed approximately 31? above the floor. There should be at least 21? of free space in front of the sink. Start by figuring out the exact location and height of the new sink you want to install.

How To Rough-In A Sink

You can then measure where the drain pipe will be. The drain pipe fitting should be between 16 and 20? above the floor. Make sure you leave enough room for the P-trap that will be directly under the sink bowl. You should leave at least 12? under the lowest point of the sink bowl so the P-trap can fit.

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