Calculate Gutter Size Uk

Using the 5280 square feet example from step 6 you will choose a gutter size that can handle at least 5280 square feet.

Calculate gutter size uk. 6 inch 7 960 square feet. That will show how much water a gutter will have to drain. Increasing the capacity of your gutter system. Calculate the square footage by getting up there with a tape measure.

5 inch 5 520 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. Move the outlet downpipe from the end of the gutter to the middle. 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.

Change the style of gutters to one with a greater capacity. Then use the chart below to see what size gutter you need. Add a fall to the gutters which we recommend you do anyway. Geographical location and rainfall intensity maps.

Divide the inch per hour watershed of the roof by the 5 minute rainfall intensity. British standard bs en 12056 3. 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. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

The most logical way to choose your gutter size would be according to the area of your roof. Determine the rainfall intensity for your location. 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. Frequency and positioning of outlets downpipes.

2000 contains maps showing. Gutter ratio l1 l1 l2 where. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Choosing the right size of gutters and downpipes step 1.

To limit the effects of thermal expansion in gutters 50 ft. That is how much rain a roof can drain during the most intense rainfall. For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from. 15 m is a practical maximum gutter length to be served by a downspout.

If a roof s various drainage areas call for different size gutters go for the biggest one k style.