How To Measure Gutter Downspout Size

The second most common style of downspouts in urban homes is the rectangular downspout coming under a range of sizes such as 2 3 3 4 and 4 5.

How to measure gutter downspout size.

Find the rainfall intensity for your locale. Don t use downspouts measuring less than 7 square inches in diameter except for with small areas like a porch or canopy. This is the area where the water will run off. Now that we are well aware of the various gutter downspout sizes and styles let us dig deeper into the materials used for effective downspouts and how much they shall cost.

6 inch 7 960 square feet. Which size of gutter guard by gutterglove do you need. Multiply length peak to. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

Measuring existing gutters 1. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. Once you get the peak to eave length multiply it by the width to determine the square footage. Then use the chart below to see what size gutter you need.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. How do you calculate gutter size. If your gutter is 5 inches wide or less you ll need our 5 inch kit. Make sure the downspout diameter is consistent throughout its length.

5 inch 5 520 square feet. Find the width of the gutters. Rainfall intensity is measured in a 5 minute interval translated. Measure the roof to get the watershed area the area from which water will run off.

Run the tape measure from 1 corner of the gutter as far as you can go toward. How to calculate gutter and downspout capacity step 1. The steeper a roof s pitch the more windblown rain it can collect. Measure your gutter across the top from the back where the gutter meets the home to the outer edge.

5 10 pack kit 40. Using 2 downspouts doubles the capacity of the gutter to manage water runoff without overflowing. Measure the length of each gutter run. Make sure the downspout size suits the bottom width of the gutter so that a tight fit is achieved.

Measure the height of. Adjusting for pitch and rainfall.