Plumbing Symbols: Guide To Help You Figure Out What To Draw

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Plumbing Symbols: What They Mean

Housing plans and plumbing diagrams use plumbing symbols to represent pipes and fixtures.

You need to familiarize yourself with these symbols if you want to get plumbing upgrades approved by your local building department or want to interpret housing plans.

The purpose of these symbols is to indicate where the different elements of your plumbing system are located. Some of these symbols are self-explanatory, but others might be more difficult to interpret.

Here is what the most common symbols used in plumbing diagrams mean.

Plumbing pipes are represented by different lines.

These lines will give you an idea of the plumbing layout of your home.

Figuring out the exact location of your plumbing pipes is crucial since they will impact where fixtures can go and might also have an impact on the design of your home.

Waste pipes are represented by solid lines if they are above ground.

If a waste pipe is located underground, you will use large dashes to represent it on your plumbing diagram.

These lines represent vents.

Other Symbols

These small dashes will be used to represent the main vent stack and well as smaller vents that are connected to the main stack.

Water supply line symbols use combinations of dashes.

Valves

You can use a large dash followed by a smaller dash to represent a cold water supply line.

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