How To Put In A Roof Drain

Cities based on inches per hour that may fall during a storm of one hour duration and a 100 year return period.

How to put in a roof drain. The placement of the drain to other rooftop units should be carefully determined. The drain is typically placed along the edge of the roof but it can be placed anywhere that you think it will do the most good. I usually dig a trench about 12 to 14 inches deep for downspout drain lines. Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out.

To prevent erosion make a rock bed around the end of the tube. The most logical place to put the drain is at the lowest area of the roof. The fastest way is to rent a trenching machine from a local tool rental. Select number of roof drains and calculate the roof area sloped to each 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. The roof should slope toward the drain. Appendix b in the ipc provides rates of rainfall for various u s. Size vertical storm drainage piping.

A drain strainer must be designed to allow small debris and water to flow freely to the drain. Size horizontal storm drainage piping. Even though it is called a flat roof it is not actually flat and instead has a very minor slope to it. If the drain was messed up by other roofers then the second best thing to do is to install a retrofit.

If you have hard clay soil or rocky soil you can use an electric hand held demolition hammer tool to dig a trench. One of the most overlooked. Flat roof drains scuppers gutters and drainage systems on flat roofs. It is crucial to have a proper drain for a flat roof.