Double Vanity Drain Pipe Size

Measure 21 inches approximately above the finished floor.

Double vanity drain pipe size.

Minimum drain line size for a double bathroom sink vanity. A single bathroom sink lavatory drain is 1 drain fixture unit. The bathroom sink s water lines are roughed in 3 inches above the drain. This diagram of a typical dwv system is called a plumbing tree.

All the pipes that connect to the tailpiece including the p trap assembly. 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. A double vanity can offer a his and hers sink. The last size is 4 inch drain pipe that can be connected to 160 units in horizontal stack and 240 units in vertical stack.

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. 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. 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. You ll see these distances also in our sketch at left.

You probably haven t spent much time observing the pipes beneath your vanity but take a look and this is what you ll see. Cut the tailpiece extending vertically down from each drain using a hacksaw so the pipe that extends from it can maintain a downward slope. The current drain line in the crawl space is 1 1 2. I am replacing a single sink vanity with a double sink.

The center of the lav s drain is located 18 approximately above the finished floor. 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. This pipe size is commonly used for sanitary drainage. Bathroom vanity with cooper 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. Therefore a 1 1 2 inch drain will accommodate a double bathroom sink vanity. This is the minimum size to use for building sewer or drain pipe that is connected to the toilet. Make sure you follow p3005 1 drainage fittings and connections and the reference table p3005 1 which specifies the proper pipe connections fittings to use to connect it all together.