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Cascade Continuous Gutters is here to "Protect Your Investment". Even if you are just shopping for contractors we would like to provide some basic knowledge to empower you to make an educated decision in choosing the best gutter contractor. The drawing below illustrates the amount of rain a different pitch roof will collect. Assuming the rain comes straight down they are all the same, even though the roof area of a 12/12 pitch roof is more than that of a 4/12 roof the building area (foot print) is the same.
The difference will be the rate the roof will shed water, the roof material (metal, wood, asphalt) also regulates run off. Larger downspouts or more downspouts may want to be used for say a 12/12 metal roof. A standard rule for downspouts is that a 2 x 3 will drain 600 sq. ft. area, 3x4 1200 sq. ft. area. To calculate your water collecting roof area multiply line A by line B. There should be at least one 2" x 3"downspout for every 40' of gutter or 600 sq ft. of roof area, the gutter should be secured every 2'. The back of the gutter should always be under the metal roof drip-edge on less then 6/12 pitch roofs. This will prevent water sucking back and running behind the gutter and rotting out the face board. Technical Information: Gutter
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