Calculating Size Of Gutters

Then use the information below to see what size gutter you need.

Calculating size of gutters.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to. Simplified app for android phones.

The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

6 inch 7 960 square feet. To limit the effects of thermal expansion in gutters 50 ft. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts.

Calculate the area of a roof to work out how much guttering is required. Doubling the number of downspouts halves the required capacity for each. Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs. Overflow calculator for eaves gutters.

In response smacna s technical resources department has created a free downspout and gutter sizing calculator. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Size downspouts to fit the gutter. 6 inch 7 960 square feet.

Please lower the maximum spacing between downspouts to see this effect. Downspout sizes must not exceed the bottom width of the gutter. 15 m is a practical maximum gutter length to be served by a downspout. 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.

Water pipe size calculator information video water pipe size calculators size every pipe in your project in seconds with just 3 clicks. 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. 5 inch 5 520 square feet. In half round the capacities are 2500ft for 5 inch and for 6 inch 3840ft.

The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. In plastic k style 5 inch guttering will drain up to 5520 ft 6 inch up to 7960 ft. Then use the chart below to see what size gutter you need.