6 inch 7 960 square feet.
Calculate gutter size uk.
Determine the rainfall intensity for your location.
British standard bs en 12056 3.
Ask gutter suppliers what size gutters will be needed to handle that amount.
If you ve got a simple gable end roof then it s easy you only need to know two figures one for either slope.
Choosing the right size of gutters and downpipes step 1.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
That will show how much water a gutter will have to drain.
For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from.
To limit the effects of thermal expansion in gutters 50 ft.
Geographical location and rainfall intensity maps.
Using the 5280 square feet example from step 6 you will choose a gutter size that can handle at least 5280 square feet.
That is how much rain a roof can drain during the most intense rainfall.
Calculate the number of outlets per.
Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.
Move the outlet downpipe from the end of the gutter to the middle.
5 inch 5 520 square feet.
Calculate the square footage by getting up there with a tape measure.
Gutter ratio l1 l1 l2 where.
Frequency and positioning of outlets downpipes.
Design area effective area 5 x 10 x 1 29 64 5m run off 64 5m x 0 022 l s per m 1 42 l s from chart 125 x 100 gutter with 76 ΓΈ downpipe appears suitable but check.
Change the style of gutters to one with a greater capacity.
The most logical way to choose your gutter size would be according to the area of your roof.
2000 contains maps showing.
Then use the chart below to see what size gutter you need.
15 m is a practical maximum gutter length to be served by a downspout.
Increasing the capacity of your gutter system.
Lg 10 133 therefore reduction factor 0 86 d 0 1 gutter capacity x reduction factor 2 84 x 0 86 2 44 l s therefore the proposed system is suitable.
Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
