Downspouts

Downspouts channel the water from the gutter to the ground or to the underground pipe system. Sizing downspouts for your project is important. If the downspout is to small it will cause water to over flow the gutter or not spaced properly. The larger and steeper the roof area the larger the downspout you need! Downspout sizes are measured in inches.

Downspout size is determined according to the roof area:

2x3 inch downspout will suffice for 500 square foot of roof

3x4 inch downspout will suffice for 1,100 square foot of roof

4x5 inch downspout will suffice for 1,900 square foot of roof

Spacing downspouts Rules of Thumb:

2"x 3" square and 3" round = space every 30ft

3"x 4" square and 4" round = space every 40ft

4"x 5" square = space every 50ft