Calculate Gutter Size Uk

Ask gutter suppliers what size gutters will be needed to handle that amount.

Calculate gutter size uk.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Frequency and positioning of outlets downpipes. Determine the rainfall intensity for your location. L1 l2 selecting gutter size there is no standard rate of rainfall in the uk so for accurate calculations refer to an approved weather authority to get a site specific rainfall level.

15 m is a practical maximum gutter length to be served by a downspout. Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity. 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 ø downpipe appears suitable but check. Geographical location and rainfall intensity maps.

British standard bs en 12056 3. 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. Then use the chart below to see what size gutter you need.

Calculate the number of outlets per. Choosing the right size of gutters and downpipes step 1. For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from. Using the 5280 square feet example from step 6 you will choose a gutter size that can handle at least 5280 square feet.

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. Change the style of gutters to one with a greater capacity. Downspout sizes must not exceed the bottom width of the gutter. Gutter ratio l1 l1 l2 where.

That will show how much water a gutter will have to drain. Calculate the square footage by getting up there with a tape measure. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. 5 inch 5 520 square feet.

Add a fall to the gutters which we recommend you do anyway. That is how much rain a roof can drain during the most intense rainfall. The most logical way to choose your gutter size would be according to the area of your roof. 2000 contains maps showing.

Increasing the capacity of your gutter system.