How Many Feet Are My Gutters

For downspouts a good rule of thumb is one for every 40 feet of guttering.

How many feet are my gutters.

The bigger your roof and the more rain you get the bigger your gutters will need to be. There is a simple and accurate way to measure and calculate linear feet for gutters that doesn t require climbing all the way up on the roof. Step 1 position a ladder at one end of a wall with a gutter or where one is to be installed. Use the chart below to figure out how many extra downspouts you need.

If the adjusted square footage is equal to or less than 2 500 feet 760 m choose 5 in 13 cm half round gutters. Doubling the number of downspouts halves the required capacity for each. Gutters come in k style and half round style. Therefore this roof should be equipped with 6 inch k style gutters.

Always inspect ladders before using them and make certain the feet of the ladder are secure before climbing up. For rainy climates where gutters will handle a larger amount of water for long periods they should have a maximum distance of 18 inches apart between them. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of.

Size downspouts to fit the gutter. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. As with gutters a downspout s capacity must match or exceed the expected runoff. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.

If you live in a warm place with sporadic rain you can hang gutter hangers close to the middle of the gutter with a spacing of no more than 36 inches or three feet apart from the center. Next you ll need to choose your material. Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet.