Run On Flat Roof

Flat roof drainage.

Run on flat roof.

Water does not run off of it very easily. To avoid ponding and leaks flat roofs typically have a nominal drainage slope of 2 to 4. Occasionally a new flat roof will be required to replace an old roof. Particularly with commercial roofs there s more of a chance for them to be flat because that is the most common design.

A correctly build flat roof will drain the rainwater quickly and effectively into the gutters without allowing water to collect in depressions and pond on the surface of the roof leading to the build up of silt deposits on the roof and stresses in the membrane when the water freezes a small amount of ponding is inevitable and it should not reduce the. The industrial age brought about economical building methods and the prevalence of flat roof construction. However flat roofs are not really flat. It is a simple and cost effective method to use for certain commercial construction buildings like warehouses.

There s a problem with flat roofs. So flat roofs are really low slope roofs most of the time. So most flat roofs have at least a little slope either towards one or more roof edges or towards roof drains. Flat roof examples see membrane single ply roofs.

They would be more accurately called low slope roofs. Using a lean to flat roof allows water to run easily away from the building into new gutters which can be connected to existing drainage systems or even new soakaways. With the proper roof slope and drainage installation precipitation is not a problem for buildings with flat roofs.