Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to.
Calculating size of gutters.
15 m is a practical maximum gutter length to be served by a downspout.
6 inch 7 960 square feet.
The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts.
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.
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 chart below to see what size gutter you need.
5 inch 5 520 square feet.
Then use the information below to see what size gutter you need.
Size downspouts to fit the gutter.
Simplified app for android phones.
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.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts.
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.
Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs.
Overflow calculator for eaves gutters.
6 inch 7 960 square feet.
In half round the capacities are 2500ft for 5 inch and for 6 inch 3840ft.
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.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
Calculate the area of a roof to work out how much guttering is required.
5m x 4m x 4 2 40 square metres.
Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.
Doubling the number of downspouts halves the required capacity for each.
Downspout sizes must not exceed the bottom width of the gutter.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
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.
In response smacna s technical resources department has created a free downspout and gutter sizing calculator.
