Calculating Gutter Sizes 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.

Calculating gutter sizes uk.

As a consequence sizing the gutter spout is key to properly sizing a gutter system. If a roof s various drainage areas call for different size gutters go for the biggest one k style. 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.

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. 5 inch 5 520 square feet. Then use the chart below to see what size gutter you need.

Calculate the square footage by getting up there with a tape measure. Gutter ratio l1 l1 l2 where. Add a fall to the gutters which we recommend you do anyway. Change the style of gutters to one with a greater capacity.

If you ve got a simple gable end roof then it s easy you only need to know two figures one for either slope. Move the outlet downpipe from the end of the gutter to the middle. 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. 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.

Determine the surface area of your roof.