The floor drain has an area which bypasses the trap.
Cast iron basement floor drain diagram.
The diagram at right shows a p trap which can be found at sinks showers and bath tubs.
The drainpipes are made of cast iron galvanized pipe copper or plastic.
Basement floor drains don t get a lot of attention until the sewer backs up or the basement smells like an outhouse.
The laundry room floor drain is one of those things that you notice but you don t pay much attention to until there is a problem.
A typical bathroom sink is a good example of how all these components work together.
Local building codes that regulate the materials used in the dwv system have changed over the years so most older homes have a combination of materials.
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Many basement floor drains tie directly to the home s sewer system but in some communities local building codes require floor drains to run to a sump pit where a pump lifts the water to the exterior surface of the house.