Upon completion a full set of rainwater drainage design calculations are provided confirming the.
Box gutter size calculator uk.
To limit the effects of thermal expansion in gutters 50 ft.
Calculate the area of a roof to work out how much guttering is required.
Choose gutter outlets according to published flow rate capacities.
5 inch 5 520 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.
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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.
For accurate project specific advice on rainwater flow calculations contact our friendly knowledgeable team on 0800 644 44 26.
Our online tools have been designed with simplicity in mind removing the need for any prior specialist industry knowledge.
Depending on building type a safety factor should be allowed for the sizing of internal gutters.
Resources aluminum series acm series column covers fastener series zinc series testing data aama pdf astm pdf gutter sizing sheet metal gages order literature northclad gutter size requirement calculator this calculator uses current data to calculate the required size of gutter as well as number and size of downspouts based on your input.
Calculate the effective catchment area x to be drained from the following table.
15 m is a practical maximum gutter length to be served by a downspout.
To select the size of the classical rainwater system the following method should be used.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Then use the chart below to see what size gutter you need.
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.
The tools guide the user step by step allowing fast and simple roof drainage design whilst ensuring full compliance with bs en12056 3 rainwater drainage design standard.
Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.
Gutter ratio l1 l1 l2 where.
Table 1 calculation of area drained type of surface effective design area m 1 flat roof plan area of relevant portion 2 pitched roof 30 pitched roof 45 pitched roof 60 plan area of portion x.
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 ΓΈ downpipe appears suitable but check.
For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.