Roof Area Per Downspout

If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Roof area per downspout.

This durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation. Then use the information below to see what size gutter you need. The table is based on rainfall intensity 100 mm per hour 4 inches per hour. Size downspouts to fit the gutter.

Come visit our selection of quality products. Welcome to gutter supply your online reference for gutters gutter machines gutter guards and accessories. Given the area factor b in table 10c the design area is design area plan area x b 1600 x 1 05 1680 sf. Calculate the total roof area by multiplying its length by width.

Intensity lasting calculated roof area intensity lasting calculated roof area 5 minutes drained per 5 minutes drained per downspout area downspout area in hr mm hr sq ft sq m in hr mm hr sq ft sq m sq in 100 sq mm sq in 100 sq mm 7 4 187 160 2 30 10 4 265 110 1 70 7 1 181 170 2 40 9 9 251 120 1 70 1 8 46 660 9 50 3 1 77 390 5 70. Compatible with 2 in. The minimum downspout size is min. Calculate total roof area.

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. Determine leader or pipe size. 5 inch 5 520 square feet. Rainfall intensity should always be checked with the local authorities.

More product details close. Doubling the number of downspouts halves the required capacity for each. The roof plan area that is drained by each downspout is plan area 40 x 40 1600 sf. A high slope moves water more quickly and if gutters have trouble dealing with a lot of.

Metal or vinyl downspouts this versatile downspout has a lifetime guarantee. This should be considered when connecting gutters and downspouts. Use the downspout to redirect runoff and help prevent garden erosion and foundation damage. From table 10a column b2 the area drained per square inch of downspout is 130 sf.

Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. There are 5 easy steps to figure out how many drains your commercial roofing project will need. The more roof surface above the gutters the more rainwater will be caught and funneled down into those gutters. Smacna s new downspout and gutter sizing calculator enables the user to manually enter the design area of the roof or use the design area wizard for the calculation.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.