Roof Drainage Terms

The same roof has a 4 12 or 1 3 pitch.

Roof drainage terms.

Based on vertical drain leader diame ter roof slope roof area per drain and rainfall rate. 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. Typical problems and design. 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. They are often positioned towards the center of the roof or the place where the slope of the roof allows water to collect. It is also called a clamp collar clamp ring or flashing ring. 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.

It is also referred to as a drain basket drain cover or birdcage. Siphonic drains typically cost more than other drain systems but they work smoothly and require relatively little maintenance. The internal drain system usually features a. The drainage pipes are placed under the roof and in the walls of the building.

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. 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. 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.