Length-of-Ridge on Hip Roofs
For calculating the length of a ridge simply subtract the width from the length. For example, assume the roof shown below is traditionally formed.
Ridge = Length – Width = 60’ – 30’ = 30’
The simplicity of this formula might surprise you, but it is converted indeed. To prove it, let’s do the same calculation in a direct way.
100’ – 15’ – 15’ = 70’
The reason why the distance from the eave to the ridge is 15’ is that they form isosceles triangles which have two 45 degrees angles and a 90 degrees angle; the two 45 degree angles must have the same length or shown below: