Calculating Gutter Sizes Uk

For example if your roof is 40 feet long and 20 feet wide you area will be 800 square feet.

Calculating gutter sizes uk.

5 inch 5 520 square feet. Add a fall to the gutters which we recommend you do anyway. Gutter ratio l1 l1 l2 where. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

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. Use the formula a l x w where a is area l is length and w is width. 6 inch 7 960 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.

The most logical way to choose your gutter size would be according to the area of your roof. Calculate the square footage by getting up there with a tape measure. As a consequence sizing the gutter spout is key to properly sizing a gutter system. Change the style of gutters to one with a greater capacity.

For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from. Move the outlet downpipe from the end of the gutter to the middle. 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. Then use the chart below to see what size gutter you need.

Increasing the capacity of your gutter system.