About Drain, waste and vent system installation

The most important step of building a DWV system is the design stage. Every sink, tub, toilet and drain needs to be vented to the outside through a vent stack. If you are adding a new sink, such as for a wet bar or for a bathroom expansion, then it is important to know where the current waste pipes are. In newer construction, DWV pipes are primarily made of PVC pipe. In older homes, pipes may be constructed of cast iron or copper.

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