Calculate Gutter Size Uk

15 m is a practical maximum gutter length to be served by a downspout.

Calculate gutter size uk.

Gutter ratio l1 l1 l2 where. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. 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. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Add a fall to the gutters which we recommend you do anyway. 2000 contains maps showing. British standard bs en 12056 3. Calculate the number of outlets per.

Then use the chart below to see what size gutter you need. 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. Calculate the square footage by getting up there with a tape measure.

5 inch 5 520 square feet. To limit the effects of thermal expansion in gutters 50 ft. The most logical way to choose your gutter size would be according to the area of your roof. 6 inch 7 960 square feet.

Move the outlet downpipe from the end of the gutter to the middle. Ask gutter suppliers what size gutters will be needed to handle that amount. Determine the rainfall intensity for your location. That will show how much water a gutter will have to drain.

Choosing the right size of gutters and downpipes step 1. Geographical location and rainfall intensity maps. That is how much rain a roof can drain during the most intense rainfall. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Change the style of gutters to one with a greater capacity. Frequency and positioning of outlets downpipes. Increasing the capacity of your gutter system. 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.