How Do You Read a Plumbing Drain Pipe Diagram?


Quick Answer

To read a plumbing drain pipe diagram, start at the sink. When water goes down the drain, it first flows through a p-trap and then into a drainpipe. That pipe leads to a soil stack, which takes the water to the sewer or septic tank. Showers are constructed similarly. Toilets, on the other hand, simply have a soil pipe that leads directly to the soil stack and into the sewer or septic tank; sewer gases are expelled through roof vents.

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Full Answer

Any clogs in the plumbing system are addressed at the clean out points. These points are Y-shaped and easily accessible so any obstructions can be removed. Y-shaped pipes are often found outside the house, near the ground. Use a wrench and take off the cap. Use a plumbing snake to take care of the blockage.

Three types of pipes make up a plumbing system. Drainpipes run water from showers, bath tubs, sinks and any appliances that use water, such as a washing machine or dishwasher. Waste pipes are dedicated solely to the removal of things from the toilet. Vent pipes are in place to separate sewer gases from the wastewater in order for it to move freely. These pipes can be constructed of cast iron, plastic, copper or galvanized pipe; many homes have combinations of the four.

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