Roof Drain Layout

Install a drain at most 50 ft.

Roof drain layout.

Most draining systems on flat roofs have a poor design or are not correctly installed. General roof drain system guidelines. The full flow capacity of a drain is not realized until the water reaches approximately 2 5 above the inlet in a four inch drain and 3 5 in a six inch drain. This form of roof drainage is preferred if a clean exterior appearance is desired.

From the edge of a valley. Limit roof area to 25 000 sq. Use at least two drains where possible. It is very critical to position drains for maximum effect.

Sizing a roof water drain the first step in sizing a roof drain is to calculate the surface area of the roof that the drains will be covering as well as the average hourly rainfall rate at the building location. These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond. The sizing of roof drains must be large enough to quickly carry away all water entering the roof drains. Following are some basic design guidelines to consider as part of your project courtesy of jay r.

Factors which affect proper roof drainage are deck slope drain size and placement of drains. So often we find that inner drains are high on the roof causing water to pool around them. From a roof edge. There are three types of drain systems on a flat roof.

Roof drains zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax.