How To Measure Gutter Downspout Size

Rainfall intensity is measured in a 5 minute interval translated.

How to measure gutter downspout size.

The steeper a roof s pitch the more windblown rain it can collect. Which size of gutter guard by gutterglove do you need. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Adjusting for pitch and rainfall.

Using 2 downspouts doubles the capacity of the gutter to manage water runoff without overflowing. Make sure the downspout size suits the bottom width of the gutter so that a tight fit is achieved. How do you calculate gutter size. How to calculate gutter and downspout capacity step 1.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. Then use the chart below to see what size gutter you need. 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.

Measuring existing gutters 1. If your gutter is 5 inches wide or less you ll need our 5 inch kit. This is the area where the water will run off. Find the rainfall intensity for your locale.

5 inch 5 520 square feet. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Don t use downspouts measuring less than 7 square inches in diameter except for with small areas like a porch or canopy. Make sure the downspout diameter is consistent throughout its length.

Multiply length peak to. Find the width of the gutters. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. You ll need to measure the roof to determine the watershed area.

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. Measure the height of. Measure the roof to get the watershed area the area from which water will run off. 6 inch 7 960 square feet.

Run the tape measure from 1 corner of the gutter as far as you can go toward. Measure the length of each gutter run.