Double Vanity Drain Pipe Size

The current drain line in the crawl space is 1 1 2.

Double vanity drain pipe size.

You probably haven t spent much time observing the pipes beneath your vanity but take a look and this is what you ll see. The last size is 4 inch drain pipe that can be connected to 160 units in horizontal stack and 240 units in vertical stack. 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. Cut the tailpiece extending vertically down from each drain using a hacksaw so the pipe that extends from it can maintain a downward slope. 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. You ll see these distances also in our sketch at left.

Also notice the drain is centered right in the middle of this 30 inch vanity. I am replacing a single sink vanity with a double sink. 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. This pipe size is commonly used for sanitary drainage.

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. A double vanity can offer a his and hers sink. Bathroom vanity with cooper sink. The center of the lav s drain is located 18 approximately above the finished floor.

This line empties into a 3 line after about 10 feet and has a drop of over 6. The bathroom sink s water lines are roughed in 3 inches above the drain. Measure 21 inches approximately above the finished floor. This diagram of a typical dwv system is called a plumbing tree.

A single bathroom sink lavatory drain is 1 drain fixture unit. Minimum drain line size for a double bathroom sink vanity. 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. 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.