Calculate Gutter Size Uk

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.

Calculate gutter size uk.

Calculate the square footage by getting up there with a tape measure. Determine the rainfall intensity for your location. Calculate the number of outlets per. Move the outlet downpipe from the end of the gutter to the middle.

The most logical way to choose your gutter size would be according to the area of your roof. Downspout sizes must not exceed the bottom width of the gutter. 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. 2000 contains maps showing.

Add a fall to the gutters which we recommend you do anyway. 5 inch 5 520 square feet. Gutter ratio l1 l1 l2 where. Frequency and positioning of outlets downpipes.

Change the style of gutters to one with a greater capacity. Increasing the capacity of your gutter system. 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.

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. For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. 15 m is a practical maximum gutter length to be served by a downspout.

6 inch 7 960 square feet. That will show how much water a gutter will have to drain. If you ve got a simple gable end roof then it s easy you only need to know two figures one for either slope. 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. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. British standard bs en 12056 3. To limit the effects of thermal expansion in gutters 50 ft.

Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity.