Calculate Gutter Size Uk

Add a fall to the gutters which we recommend you do anyway.

Calculate gutter size uk.

Increasing the capacity of your gutter system. Change the style of gutters to one with a greater capacity. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

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. Frequency and positioning of outlets downpipes. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Ask gutter suppliers what size gutters will be needed to handle that amount. 6 inch 7 960 square feet. 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. 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.

That will show how much water a gutter will have to drain. Calculate the square footage by getting up there with a tape measure. 15 m is a practical maximum gutter length to be served by a downspout. Determine the rainfall intensity for your location.

Gutter ratio l1 l1 l2 where. 2000 contains maps showing. That is how much rain a roof can drain during the most intense rainfall. Calculate the number of outlets per.

5 inch 5 520 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. British standard bs en 12056 3. Choosing the right size of gutters and downpipes step 1.

To limit the effects of thermal expansion in gutters 50 ft. Move the outlet downpipe from the end of the gutter to the middle. Downspout sizes must not exceed the bottom width of the gutter. The most logical way to choose your gutter size would be according to the area of your roof.

Using the 5280 square feet example from step 6 you will choose a gutter size that can handle at least 5280 square feet.