Double Vanity Drain Pipe Size

The center of the lav s drain is located 18 approximately above the finished floor.

Double vanity drain pipe size.

This line empties into a 3 line after about 10 feet and has a drop of over 6. I am replacing a single sink vanity with a double sink. Water runs down the sink drain into a p trap so called because it s shaped like the letter which fills up with water to prevent sewer gases and odors. I would like to use all 1 1 2 lines in the wall and connect to the 1 1 2 line to drain for both sinks.

This diagram of a typical dwv system is called a plumbing tree. Measure 21 inches approximately above the finished floor. The bathroom sink s water lines are roughed in 3 inches above the drain. A single bathroom sink lavatory drain is 1 drain fixture unit.

Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. The current drain line in the crawl space is 1 1 2. For example if two pipes are specified to be 10 inches apart you measure 10 inches between the centers of the pipes not 10 inches between the edges of the pipes. Also notice the drain is centered right in the middle of this 30 inch vanity.

Below our tables 1 and 2 summarize common plumbing code specifications for fixture venting and vent pipe sizes and distances that a plumbing fixture can be located horizontally from the vent stack. Some older sinks may have drains that connect to a 1 1 4 inch tailpiece but most modern drains have a 1 1 2 inch outlet. All the pipes that connect to the tailpiece including the p trap assembly. Bathroom vanity with cooper sink.

Therefore a 1 1 2 inch drain will accommodate a double bathroom sink vanity. This pipe size is commonly used for sanitary drainage. Cut the tailpiece extending vertically down from each drain using a hacksaw so the pipe that extends from it can maintain a downward slope. This is the minimum size to use for building sewer or drain pipe that is connected to the toilet.

As with the term on center which is used for construction the term centerline is an imaginary vertical line drawn through a key reference point usually the drain pipe. A double vanity can offer a his and hers sink. You probably haven t spent much time observing the pipes beneath your vanity but take a look and this is what you ll see. You ll see these distances also in our sketch at left.