Calculating Size Of Gutters

Calculate the area of a roof to work out how much guttering is required.

Calculating size of gutters. 6 inch 7 960 square feet. Then use the information below to see what size gutter you need. In plastic k style 5 inch guttering will drain up to 5520 ft 6 inch up to 7960 ft. In response smacna s technical resources department has created a free downspout and gutter sizing calculator.

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. 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. Water pipe size calculator information video water pipe size calculators size every pipe in your project in seconds with just 3 clicks. Doubling the number of downspouts halves the required capacity for each.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. To limit the effects of thermal expansion in gutters 50 ft. Simplified app for android phones. Then use the chart below to see what size gutter you need.

In half round the capacities are 2500ft for 5 inch and for 6 inch 3840ft. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. 5 inch 5 520 square feet. 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.

15 m is a practical maximum gutter length to be served by a downspout. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Ratio of depth to width of gutter select gutter ratio 0 125x 0 25x 0 375x 0 5x 0 625x 0 75x 0 875x 1x 1 125x 1 25x 1 375x 1 5x 1 625x 1 75x 1 875x 2x calculate drainage reset. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Downspout sizes must not exceed the bottom width of the gutter. 6 inch 7 960 square feet. Overflow calculator for eaves gutters.

Please lower the maximum spacing between downspouts to see this effect. Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to. Size downspouts to fit the gutter. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.

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. 5m x 4m x 4 2 40 square metres.