Formula To Calculate Gutter Size

Please lower the maximum spacing between downspouts to see this effect.

Formula to calculate gutter size.

To calculate the effective roof area you should use this formula. Downspout sizes must not exceed the bottom width of the gutter. Remember two gutter lengths can share the same downspout so if you calculate the max gutter to be 40 feet you could put a downspout halfway in an 80 foot length. Gutter sizing step 4 calculate water handling capacity for gutter downspout options.

When selecting and. Calculate roof area to be drained by your gutter system and note roof pitches. Commercial roof structures can be complex consisting of many areas shapes and configurations. Water pipe size calculator information video water pipe size calculators size every pipe in your project in seconds with just 3 clicks.

Enter larger gutter widths in the yellow boxes to find out how wide your gutters need to be given the length that you want to go between downspouts. The simple way to calculate gutter sizes. The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. There are two things you need to know.

Total roof area also affects runoff. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to the specifications in smacna s architectural sheet metal manual 7th edition 2012. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts.

The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Simplified app for android phones. Then use the information below to see what size gutter you need. 15 m is a practical maximum gutter length to be served by a downspout.

Overflow calculator for eaves gutters. Then use the chart below to see what size gutter you need. If a roof s various drainage areas call for different size gutters go for the biggest one k style. 6 inch 7 960 square feet.

To limit the effects of thermal expansion in gutters 50 ft. An inch of rain is not much but it if falls in half an hour it could flood a gutter. Roof length x half roof width x roof height 2 roof area. Gutter sizing step 1 determine roof area to be drained.

5 inch 5 520 square feet. Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs. So for a roof that is 5 m long with a height of 4 m and the. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

5 inch 5 520 square feet. Gather some basic weather information to calculate the proper size for gutters and downspouts for a house. Minimum top opening width max. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.