Calculate Gutter Size Uk

Refer to the gutter packaging or specification for the recommended downspout size.

Calculate gutter size uk.

Gutter ratio l1 l1 l2 where. Now finally you can find the appropriate gutter size by looking at the following figures showing the relationship between different gutter systems and the roof area they ll be able to drain. Determine the size of your downspout. Depending on building type a safety factor should be allowed for the sizing of internal gutters.

Total roof area also affects runoff. 5 inch 5 520 square feet. 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.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. An inch of rain is not much but it if falls in half an hour it could flood a gutter. 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. The total rainfall and how rapidly it falls will affect the runoff from the roof.

These figures are based on a rainfall intensity of 75mm hr roof pitch not exceeding 50º gutters running full. Calculate the area of a roof to work out how much guttering is required. 5 inch 5 520 square feet. 6 inch 7 960 square feet.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 5 inch 5 520 square feet. Gather some basic weather information to calculate the proper size for gutters and downspouts for a house. Then use the information below to see what size gutter you need.

Calculate effective maximum roof area b c 2 x length of roof area in m installation. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. So for a roof that is 5 m long with a height of 4 m and the roof width is 8 m which makes the half roof width 4m we can calculate the effective roof area like this. Then use the chart below to see what size gutter you need.

5 inch 2 500 square feet. Choose gutter outlets according to published flow rate capacities. For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from. 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.

That part of the gutter in which the angle obstructs the flow. Refer to bsen 12056 part 3. Match your downspouts to the gutter size you chose in step 7. Roof drainage layout and calculations.

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