Roof Drainage System Design

There are various approaches that can accomplish this balancing act but each offers its own advantages disadvantages depending on a number of factors.

Roof drainage system design.

From the very dawn of building construction it has been necessary to incorporate some method of gathering and discharging rainwater from the roof of a structure. The design event used for sizing a roof drainage system will therefore not normally come out of a clear blue sky and then end equally suddenly but will have been preceded by a period of less intense rainfall. Typically a steep slope roof slope is equal to or greater than 3 inches of rise per 12 inches of run 25. Hence this is by far the most common roof drainage situation.

Establishing a minimum slope is critical because most steep slope roofing as. Roof drainage is one of the fundamental considerations of building design. It is important for architects plumbing engineers and civil engineers to work together to design a system that will properly drain rainwater from a building and site. Functioning drainage system for steep slope roofs is to maintain a minimum roof slope.

For most dwellings you ll find that gutters range in size from approximately 100mm diameter to 150mm diameter assuming gutters with a half round section profile and downpipes range from approximately 60mm diameter to 90mm diameter assuming circular downpipes.