Calculating Size Of Gutters

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

Calculating size of gutters.

Water pipe size calculator information video water pipe size calculators size every pipe in your project in seconds with just 3 clicks. Then use the information below to see what size gutter you need. To limit the effects of thermal expansion in gutters 50 ft. In half round the capacities are 2500ft for 5 inch and for 6 inch 3840ft.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Downspout sizes must not exceed the bottom width of the gutter. Multiply the surface area by the pitch factor to find the rain collection area for your roof and you can buy the right size guttering. Calculate the area of a roof to work out how much guttering is required.

Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. 15 m is a practical maximum gutter length to be served by a downspout. Size downspouts to fit the gutter. 5 inch 5 520 square feet.

5 inch 5 520 square feet. The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Doubling the number of downspouts halves the required capacity for each.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. 6 inch 7 960 square feet. In plastic k style 5 inch guttering will drain up to 5520 ft 6 inch up to 7960 ft. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

So for a roof that is 5 m long with a height of 4 m and the roof width is 8 m which makes the half roof width 4m we can calculate the effective roof area like this. 6 inch 7 960 square feet. 5m x 4m x 4 2 40 square metres. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.

Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs. If a roof s various drainage areas call for different size gutters go for the biggest one k style. In response smacna s technical resources department has created a free downspout and gutter sizing calculator. Please lower the maximum spacing between downspouts to see this effect.

Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Overflow calculator for eaves gutters. Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to.