Roof Drainage Terms

The drainage pipes are placed under the roof and in the walls of the building.

Roof drainage terms. A drip edge also can be used to break the continuity of contact between the roof perimeter and wall components to help prevent capillary action. The same roof has a 4 12 or 1 3 pitch. Typically a low slope roof is designed with one primary roof drain and one secondary roof drain or overflow scupper drainage outlet at the perimeter of the building per structural bay. An outlet or other device used to collect and direct the flow of runoff water from a roof area.

Typical problems and design. A metal flashing or other overhanging component with an outward projecting lower edge intended to control the direction of dripping water and help protect underlying building components. It is also referred to as a drain basket drain cover or birdcage. They are often positioned towards the center of the roof or the place where the slope of the roof allows water to collect.

The internal drain system usually features a. Drain ring a metal ring placed around the drainpipe to secure the roof drain to a surface such as a roof deck or parapet wall. Appropriate for large roofs inner drains help in draining the water away from the building. Based on vertical drain leader diame ter roof slope roof area per drain and rainfall rate.

The terms pitch and slope are simply two different ways of expressing the same measurement. A roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run. Siphonic drains typically cost more than other drain systems but they work smoothly and require relatively little maintenance.