http://www.rain-watersystems.com/uploads/3/4/8/7/34878579/2_4_gutter_and_downspout_sizing_and_location.pdf WebHow to Calculate Gutter and Downspout Capacity. Step 1. Measure the roof to get the watershed area, the area from which water will run off. Multiply length (peak to eave) by …
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WebJan 26, 2024 · The exact number of linear feet of material needed depends on how many stories your home is, the architectural style, and how many downspouts are needed. A one-story home averages $1,200, and a ... WebTo figure the number of downspouts you’ll need, you need to first establish how many roof planes will drain onto each section of gutters. If many roof planes are draining into a small area (like you see in the photo), you’ll either need extra downspouts or … Use the chart below to figure out how many extra downspouts you need. Adding a 2 by 3 rectangular downspout, for instance, boosts your gutter’s capacity by 600 square feet of drainage area. Rectangular 2 by 3 inches = 600 square feet 3 by 4 inches = 1,200 square feet Round 3 inches = 706 square feet 4 inches = … See more Once you know the total square footage of drainage for each gutter, you'll need to adjust for the following two factors: See more Multiply the drainage area by the roof-pitch factor and rainfall intensity to find out the adjusted square footage. Then use the information below to see what size gutter you need. (If a roof's various drainage areas call for different … See more What if the runoff is off the chart for standard gutters? You have three options: 1. Get 7- or 8-inch gutters.They'll cost more and probably require a custom order through a professional installer. 2. Increase the pitch of … See more church\\u0027s financial services