The most important value we have to calculate here is the Rafter length (R
Once we have R
, we can easily detremine the surface of the roof.
To calculate R
, we need to know the Length of the roof (L
), the width of the roof (W
) and the Height (H
If we have this values, we can determine the R as the hypotenuse of the triangle H, W/2, R - by using the pythagorean theorem.
Using the pythagorean theorem, we can calculate R
R² = H² + (W/2)²
R² = ² + ( / 2)²
R² = +
Now that we have R, we can calculate the surface of one slope (S1) - this is a parallelogram and its aria is R (roof rafter) x L (roof length)
And Total surface of a gabled roof - is S1 x 2 (as we have to identical slopes)