How Much Clearnce Do You Need Around A Roof Drain

The result is the number of drains needed.

How much clearnce do you need around a roof drain. The best type for the application depends on several factors such as the size and slope of the roof the desired appearance and how much regular maintenance the drain system might need. Roof drains for flat or low slope roofs come in a few standard types. By the 1997 edition of the upc section 1101 11 2 had been added that completely prescribed where and how secondary roof drainage was to be provided. Zurn makes it easy to size roof drains.

In some cases drains can be offset to rise up in walls to avoid cleanout covers in high traffic areas. A high slope moves water more quickly and if gutters have trouble dealing with a lot of water in a short period of time an extra downspout can alleviate that issue. Overflow drains shall be the same size as the roof drains with the inlet flow line two inches above the low point of the roof and shall be installed independent from the roof drains. Underground building drains for example can be routed in corridors or aisles so that cleanouts do not end up covered by casework cabinets machinery or equipment that would need to be removed for access to the drainage system.

And 4 area handled by each drain. 3 size of leader required. 1 rate of precipitation. 50 000 4 400 11 36.

The national kitchen bath association requires at least 24 inches clearance in front of a toilet. 2 total area of roof. When sizing roof drains the limiting factor for the amount of water each drain will carry away is the size of leader therefore increasing. Moreover the nkba recommends 32 inches from the center of the toilet waste line to the center.

Take the roof s total square footage and divide by the total square footage handled by one drain.