Roof Rain Gutter Design

The 5 inch option typically works for most residential homes but for steep sloped roofs 6 inches is preferred to accommodate the increased speed of the rain flow.

Roof rain gutter design. For practical purposes the roof gutter depths and areas used are assumed to hold true for all available gutter of a given style top width and material even though differences do occur. Five inch k style gutters or 6 inch half rounds the most common residential sizes are able to handle the rainfall on most houses in most parts of the country. A properly designed gutter and downspout system will take water from the roof of your house and direct it away from the house. Factors to be considered in the design of roof drainage sys tems are the area to be drained size of gutters downspouts outlets slope of roof type of building and appearance.

The rain intensity according to table 1 2 rainfall data and drainage factors uses a 5 minute duration for a 10 year or 100 year storm thereby providing a worst case scenario for the downspout and gutter design. Suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments. Gutter end caps close off the ends of gutters keeping debris and water from flowing out at this point. No more destructive ice dams from frozen gutters.

Rainhandler gutter self cleaning dispersal system eliminates clogged over flowing gutters and downspouts. Gutter hangers and gutter brackets allow gutters to attach to a house s eaves offering support and strength to the front edge. But houses with big steep roofs or those located in climates prone to heavy downpours may need wider gutters and extra downspouts to keep rainwater from overflowing. Without a gutter system water will simply fall off the roof and likely form pools near the base of your house.

Its unique rainhandler gutters louver design allows leaves and debris to blow or wash away. Roof area to be considered the design capacity for a roof drainage system depends on the quantity of water to be handled. Usually your gutter contractor will decide between 5 inch gutters with 2 by 3 inch downspouts or 6 inch gutters with 3 by 4 inch downspouts. Gutters will end where the roof no longer slopes downward.

The flows and capacities of the roof gutter and downspouts shown in this design guide are based on actual measurements taken from some of the materials available. Box gutter and rain water head at end of box gutter allowance for vertical faces and catchments on both sides of box gutter.