Roof Drainage System Design

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.

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. Establishing a minimum slope is critical because most steep slope roofing as. Typically a steep slope roof slope is equal to or greater than 3 inches of rise per 12 inches of run 25. A roof drain system s primary function is efficient water removal but in most cases it must also offer aesthetic appeal and on deck workspace.

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. Functioning drainage system for steep slope roofs is to maintain a minimum roof slope. A typical commercial or multifamily residential building will utilize one of the following types of primary roof drainage. Roof drainage is one of the fundamental considerations of building design.

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