How To Measure Gutter Downspout Size

Multiply length peak to.

How to measure gutter downspout size. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. If your gutter is 5 inches wide or less you ll need our 5 inch kit. The steeper a roof s pitch the more windblown rain it can collect. Using 2 downspouts doubles the capacity of the gutter to manage water runoff without overflowing.

Don t use downspouts measuring less than 7 square inches in diameter except for with small areas like a porch or canopy. 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. Once you get the peak to eave length multiply it by the width to determine the square footage. Measure the length of each gutter run.

See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. Find the width of the gutters. 5 10 pack kit 40. How to calculate gutter and downspout capacity step 1.

Then use the chart below to see what size gutter you need. Find the rainfall intensity for your locale. Measure the height of. You ll need to measure the roof to determine the watershed area.

Adjusting for pitch and rainfall. Make sure the downspout diameter is consistent throughout its length. Run the tape measure from 1 corner of the gutter as far as you can go toward. 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.

This is the area where the water will run off. Which size of gutter guard by gutterglove do you need. 6 inch 7 960 square feet. Rainfall intensity is measured in a 5 minute interval translated.

Measuring existing gutters 1. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. Make sure the downspout size suits the bottom width of the gutter so that a tight fit is achieved. 5 inch 5 520 square feet.

How do you calculate gutter size. Measure your gutter across the top from the back where the gutter meets the home to the outer edge.