Water Closet Drain Pipe Size

The drain pipe connects to the flange which mounts the toilet itself and this flange is usually built to connect to 3 inch schedule 40.

Water closet drain pipe size.

The minimum size of any building drain serving a water closet shall be 3 inches. The gasket tightens as the flange is turned in a clockwise rotation. Regardless of your plumbing code the minimum drain size for a toilet is 3 inches. The drainpipes collect the water from sinks showers tubs and appliances.

The waste for the water closet should be 4 in. That said we put together the following tables to serve as general guides for estimating a pipe s water flow capacity. If you have questions please call our drain wizard at 800 635 0384. The drain pipe in your toilet carries waste away into the home s main drain line.

The drainpipes are made of cast iron galvanized pipe copper or plastic. The minimum size of a fixture supply pipe shall be as shown in table 604 5 the fixture supply pipe shall terminate not more than 30 inches 762 mm from the point of connection to the fixture. The toilet s drain size. The supply pipe shall extend to the floor or wall adjacent to the fixture.

Lead pipe or a 4 in. Remember that the bottom of the flange must be set on top of the finished flooring and then screwed into the subfloor. In size but never less. Lead bend the pipe or bend being wiped to a brass ferrule which is caulked into the soil pipe and the floor connection generally being made by means.

A reduced size flexible water connector installed between the supply pipe and the fixture shall be of an approved type. Water closet s flushing 1 6 gallons or less are rated at 3 dfus drainage fixture units. The wider the pipe the more waste it can move and the. Compare the fixture to the minimum sizes of drainage pipe by fixture table.

For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter. What size are toilet waste drains. The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely. Some older model toilets flushing over 1 6 gallons per flush are rated at 4 dfus.

Waste drain pipes for toilets in modern plumbing systems are either 3 inches or 4 inches in diameter. When cast iron soil pipe is used the connection is made by means of 4 in. Water flow gpm gph based on pipe size and inside outside diameters. The third option is the pvc or abs replacement closet repair flange which also inserts into the vertical cast iron drain pipe after the old flange is removed.

Table 710 1 2 horizontal fixture branches and stacks a diameter of pipe inches.