Calculate Size Of Gutters

Gather some basic weather information to calculate the proper size for gutters and downspouts for a house.

Calculate size of gutters.

Then use the information below to see what size gutter you need. Calculate the area of a roof to work out how much guttering is required. They can be 4 5 or 6 inches. Please lower the maximum spacing between downspouts to see this effect.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. You only need a ladder chalk tape measure level paper and pen.

To choose the right size gutters for a building that doesn t already have them you can quickly calculate the drainage area of the roof and adjust for pitch and rainfall to find the adjusted square footage. Then use the chart below to see what size gutter you need. To limit the effects of thermal expansion in gutters 50 ft. Simplified app for android phones.

Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. The total rainfall and how rapidly it falls will affect the runoff from the roof. Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs.

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. 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.

5 inch 5 520 square feet. When you are completing a gutter replacement the first point to note is that gutters come in different sizes. Total roof area also affects runoff. 15 m is a practical maximum gutter length to be served by a downspout.

Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size. An inch of rain is not much but it if falls in half an hour it could flood a gutter. Overflow calculator for eaves gutters. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.

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