Asphalt shingles are soft building materials and can be cut according to the building. Therefore, the amount of asphalt shingles used depends on the actual size of the building roof. Therefore, the calculation formula for the amount of use should be considered in many ways.
Before that, let me talk about how the slope percentage should be converted. For example, the suitable slope of a sloping roof is 20%. 20% here does not mean the slope of 20°. The slope refers to the percentage of the elevation difference between the two points and the horizontal distance. The calculation formula is as follows: slope = (elevation difference/horizontal distance) x100%
When using percentages,
That is: i=h/l×100%
A slope of 20% means that for every 100 meters of horizontal distance, the vertical direction rises (descends) by 20 meters, that is, the tangent value (tan) of the angle of this slope is 0.2, which is converted into a degree of about 11°.
Asphalt shingle roof calculation rules are calculated according to the size shown in the design diagram, and the area occupied by the chimney, hood base, air duct, small transom, oblique ditch, etc. is not deducted, and the area of the small transom is not increased. However, the overlapped area of the skylight should be included in the calculation of the corresponding roofing engineering quantity. The engineering quantities of glazed tile ridges and glazed tile eaves are calculated as "extended meters" with the size and length shown in the figure.
Roof calculation formula S surface = the sum of the slanted area of the illustrated size (that is, the horizontal projected area of the slope surface × the extension coefficient). The coefficient for converting the horizontal projection area of the roof or wood base into an oblique area or converting the horizontal projection length to an oblique length, that is, using the extension factor
The actual area of the slope (slope area) = the horizontal projected area of the slope × the retardation coefficient C. When calculating the engineering quantity, regardless of the single-slope, double-slope, three-slope, four-slope or multi-slope roof, the formula can be used to calculate; when the slope of each slope is the same, the horizontal projection area of the entire roof can be multiplied by its slope delay Coefficient; when the slope of each slope is different, it should be calculated separately using formulas.