Calculate Gutter Size Uk

That is how much rain a roof can drain during the most intense rainfall.

Calculate gutter size uk.

That will show how much water a gutter will have to drain. 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. If a roof s various drainage areas call for different size gutters go for the biggest one k style. The most logical way to choose your gutter size would be according to the area of your roof.

Move the outlet downpipe from the end of the gutter to the middle. Downspout sizes must not exceed the bottom width of the gutter. Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity. Determine the rainfall intensity for your location.

Ask gutter suppliers what size gutters will be needed to handle that amount. Change the style of gutters to one with a greater capacity. Calculate the number of outlets per. Gutter ratio l1 l1 l2 where.

Using the 5280 square feet example from step 6 you will choose a gutter size that can handle at least 5280 square feet. Add a fall to the gutters which we recommend you do anyway. Geographical location and rainfall intensity maps. Choosing the right size of gutters and downpipes step 1.

6 inch 7 960 square feet. Frequency and positioning of outlets downpipes. 5 inch 5 520 square feet. For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from.

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. Then use the chart below to see what size gutter you need. To limit the effects of thermal expansion in gutters 50 ft. 15 m is a practical maximum gutter length to be served by a downspout.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. 2000 contains maps showing. Increasing the capacity of your gutter system. Calculate the square footage by getting up there with a tape measure.

British standard bs en 12056 3.