Flat Sump Area On Roofs

It is not designed to sump or lower a flat roof drain.

Flat sump area on roofs. After studying building plan and physical arrangement assume that 4 leaders are required for this project. Primary roof drains from zurn offers a full line of featuring a dura coated cast iron body with combination membrane. The roof drain is attached to it and it is set in the roof. Now to have a nicely tapered roof only to lead to a 3 by 3 flat sump is going to make a white.

Total roof area 500 by 200 100 000 sq. Rather it receives the flat roof drain. Determine rate of rainfall for this example use 4. Gravity drainage systems are only recommended for flat or low slope commercial roofs that have a surface area of less than 150m 2 per drainage point.

From table 1 one 4 leader at 4 rate of rainfall will take care of 3 460 sq. Number of roof. This in turn can cause large pools of rain water to form on the flat roof. Larger roofs collect more water that may not drain quickly enough with just a gravity system.

It is generally included when you buy a cast iron roof drain. Roof drain pans are a fast easy and cost effective solution. Since it doesn t lower the roof drain it can leave the roof drain sitting higher than the surrounding flat roof surface. The myriad of.

Large roof drain sump receiver plate. Unless the roof drains are lower than the surrounding roof they will not drain resulting in huge pools of water. Those roofs benefit from siphonic drainage systems.