Roof Drainage Terms

It is also referred to as a drain basket drain cover or birdcage.

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. A siphonic roof drain utilizes siphoning as a drainage mechanism resulting in drainage that is faster than that on any other type of roof drain. The same roof has a 4 12 or 1 3 pitch. Siphonic drains typically cost more than other drain systems but they work smoothly and require relatively little maintenance.

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. The terms pitch and slope are simply two different ways of expressing the same measurement. 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. Typical problems and design.

Appropriate for large roofs inner drains help in draining the water away from the building. It is also called a clamp collar clamp ring or flashing ring. The drainage pipes are placed under the roof and in the walls of the building. They are often positioned towards the center of the roof or the place where the slope of the roof allows water to collect.

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. Commonly used on flat commercial roofs siphonic drains allow for a minimal number of drains and all of the drains can be connected to a single leader. An outlet or other device used to collect and direct the flow of runoff water from a roof area.