Roof Drain Layout

The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.

Roof drain layout.

Use at least two drains where possible. Roof drains zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax. Factors which affect proper roof drainage are deck slope drain size and placement of drains. From a roof edge.

This form of roof drainage is preferred if a clean exterior appearance is desired. The sizing of roof drains must be large enough to quickly carry away all water entering the roof drains. From the edge of a valley. So often we find that inner drains are high on the roof causing water to pool around them.

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. 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. Install a drain at most 50 ft.

It is very critical to position drains for maximum effect. 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 roof is sloped towards the drain through either tapered insulation or through joist modifications below the roofline. Limit roof area to 25 000 sq.

There are three types of drain systems on a flat roof.