Roof Rain Gutter Design

Without a gutter system water will simply fall off the roof and likely form pools near the base of your house.

Roof rain gutter design.

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. 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. Box gutters are valley like troughs at the edges of roofs which are concealed in appearance and don t draw attention from the beauty of the house design. Roof area to be considered the design capacity for a roof drainage system depends on the quantity of water to be handled.

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. 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. 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. 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.

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. Gutters will end where the roof no longer slopes downward. 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. Gutter end caps close off the ends of gutters keeping debris and water from flowing out at this point.

Its unique rainhandler gutters louver design allows leaves and debris to blow or wash away. Built in gutters also called box or hidden gutters are actually a type of rain gutter and can replace the latter especially when the conspicuous appearance of the rain gutter is the main issue. No more destructive ice dams from frozen gutters. A properly designed gutter and downspout system will take water from the roof of your house and direct it away from the house.

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. Other pieces include elbows gutter extensions and gutter flashing.