Before selecting a gutter system is necessary to calculate whether it will be able to take all the water from the surface of the building’s roof. To do this, you need to calculate the maximum effective roof area of the building.
Calculation of the effective area of the roof (EPA):
Roof area in m2 = (C / 2 + B) x roof length
If the project takes into account the use of angles, increasing EPA the following percentage:
a) 10% – mounting angle of up to 2 m from the funnel
b) 5% – more than 2 m
The above calculations are correct, if the degree of precipitation of 75 mm / h, and the slope of the roof to a maximum of 50 degrees. For roofs with a slope of less than 10 degrees or for flat roofs, the maximum effective roof area equal to the total area of the roof.
To calculate the surface of the roof, refer to the table below, which will determine the effectiveness of individual drainage systems.
Comparative data table with a surface area of the roof, which will need to divert water to help with the selection of the optimum system. Thus, one can select the most appropriate system drain to a particular building (data in table define the maximum surface area of the roof, in which the individual elements can divert water).
|36 m2||58 m2||99 m2||99 m2||148 m2||220 m2|
|73 m2||116 m2||198 m2||198 m2||296 m2||440 m2|