Calculate Gutter Size Uk

Calculate the number of outlets per.

Calculate gutter size uk.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Then use the chart below to see what size gutter you need. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Change the style of gutters to one with a greater capacity.

6 inch 7 960 square feet. If you ve got a simple gable end roof then it s easy you only need to know two figures one for either slope. To limit the effects of thermal expansion in gutters 50 ft. Choosing the right size of gutters and downpipes step 1.

Frequency and positioning of outlets downpipes. 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. Ask gutter suppliers what size gutters will be needed to handle that amount. Downspout sizes must not exceed the bottom width of the gutter.

Using the 5280 square feet example from step 6 you will choose a gutter size that can handle at least 5280 square feet. 15 m is a practical maximum gutter length to be served by a downspout. That is how much rain a roof can drain during the most intense rainfall. Move the outlet downpipe from the end of the gutter to the middle.

Add a fall to the gutters which we recommend you do anyway. 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. Geographical location and rainfall intensity maps. That will show how much water a gutter will have to drain.

Gutter ratio l1 l1 l2 where. Increasing the capacity of your gutter system. 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.

5 inch 5 520 square feet. 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. Determine the rainfall intensity for your location.

Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity.