Sizing Your Downspouts – Part 2

Sizing the Gutters Multiply the drainage area by the roof-pitch factor and rainfall intensity to find out the adjusted 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 5-inch      5,520 square feet 6-inch      7,960 square […]