How To Do Roof Drainage

Calculate the total roof area by multiplying its length by width.

How to do roof drainage. Step by step instructions step 1. The guide gives rational to the whys and hows of allowing free drainage. Please refer to part 2. 2 3 4 5 6 and 8 in.

For flat sites it may be necessary to drain into a drywell or french drain system or into a pumping chamber that sends drainage to a remote storm drain or drywell. Determine 100 year 1 hour rainfall rate used for location of building select number of roof drains and calculate the roof area sloped to each drain size horizontal storm drainage piping. See french drains for details of handling roof runoff at flat or poorly drained sites. To put it simply scuppers are openings in the outer walls or curbs along the roof line.

Siphonic roof drain. Ipc provides four steps to size the roof drains on a building. 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. Be sure there is an adequate and appropriate number of drains for the size of your roof.

Determine leader or pipe size. Calculate total roof area. Not only will it get the water away from the house but it will also do it without any possibility of water runoff damage or erosion. Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out.

How to drain the roof. A french drain is a small trench with a perforated pipe surrounded by sand or gravel that directs the water flow away from the foundation following the grade. They allow water to run through the wall via a metal box protecting and surrounding the scupper. 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.

Where the tube passes by the downspout from the gutter we installed a y fitting and drained the roof water from the gutter system directly into the main drainage line. One of the main concerns that small scale builders have outlined to us is how to drain the roof. Gutters are the most commonly used and most cost effective drainage solution for flat roofs. Taking care of your drainage.

They catch rainwater as it rolls off the edge of the roof and divert the water into a downspout that dispenses it a safe distance from the foundation of the building. Not enough drains will cause a problem with water building up. 2 3 4 5 6. To prevent erosion make a rock bed around the end of the tube.

Gravity drainage stormwater simply drains off the roof and other areas to the ground.