Calculate Gutter Size Uk

Calculate the number of outlets per.

Calculate gutter size uk. Gutter ratio l1 l1 l2 where. Frequency and positioning of outlets downpipes. That will show how much water a gutter will have to drain. Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity.

Ask gutter suppliers what size gutters will be needed to handle that amount. Then use the chart below to see what size gutter you need. Downspout sizes must not exceed the bottom width of the gutter. That is how much rain a roof can drain during the most intense rainfall.

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. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Increasing the capacity of your gutter system. 15 m is a practical maximum gutter length to be served by a downspout.

5 inch 5 520 square feet. To limit the effects of thermal expansion in gutters 50 ft. Choosing the right size of gutters and downpipes step 1. British standard bs en 12056 3.

Move the outlet downpipe from the end of the gutter to the middle. Change the style of gutters to one with a greater capacity. Add a fall to the gutters which we recommend you do anyway. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

If you ve got a simple gable end roof then it s easy you only need to know two figures one for either slope. 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. Geographical location and rainfall intensity maps.

2000 contains maps showing. 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. Determine the rainfall intensity for your location. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

6 inch 7 960 square feet.