Standard Roof Drain Size

Or 12 drains required.

Standard roof drain size.

Calculate total roof area. The minimum size of any building drain serving a water closet shall be 3 inches. Application recommended roof drain zurn roof drains are constructed of high quality materials and in general are designed to meet the requirements of ansi standard a112 21 2m. 50 000 4 400 11 36.

300 x 500 150 000 sq. For example a 4 in. The regular flange will have a minimum 4 width with a 3 16 lip at drain body. Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow.

Inner roof drains are used on flat roofs and include a low section or channel that collects water and feeds it into a concealed drain that leads to an underground drainage system. Take the roof s total square footage and divide by the total square footage handled by one drain. Determine the size of leader to be used. For verification of a selected roof drain contact your local zurn sales representative.

Drain body should be set low enough to permit dimpling of area surrounding drain. Following this logic it is possible that for roof drains 6 in. 4 leader size is selected. The result is the number of drains needed.

Vents exceeding 40 feet 12 192 mm in developed length shall be increased by one nominal pipe size for the entire developed length of the vent pipe. The required size of the drain shall be determined in accordance with table 710 1 2. The result is a roof collapse. Inner roof drains.

1 inch 25 4 mm 1 inch per foot 83 3 mm m. Roughing dimensions of the body must be adjusted accordingly. To size the vertical roof drain for the same parameters 5 000 square feet of room area and 6 per hour of rain consult table 1106 2 figure 3. But this isn t the whole story.

The main benefit of inner drains is that the system is hidden from view. Roof area is 300 x 500 ft. Each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required. If water proof deck covering thickness is greater or less than 3 16 lip dimension must be specified.

Inches maximum number of drainage fixture units dfu total for horizontal branch. This reveals that the minimum size for the leader pipe is 5. For larger roof drains the pipe may be smaller such as a 10 in. Inner drains are resistant to freezing but can require careful maintenance to prevent problems.

Step by step sizing of zurn drains step 1. Roof drain connected to a 6 in. Or less in diameter the piping will be larger in diameter than the roof drain.