What is the formula to calculate the height of temporary support in roofing?

The formula to calculate the height of temporary support in roofing is accurately described by considering not only the height at the plate and the total rise but also accounting for any adjustments necessary due to the ridge drop and the height of the ridge beam.

When determining the height of temporary support, it's essential to start with the height at the plate, which is the base level where the rafters or trusses rest. The total rise represents the vertical distance from the plate to the highest point of the roof structure. However, to obtain the precise height required for temporary support structures, one must also subtract the ridge drop (the amount by which the ridge is lower than the theoretical straight line created by the rafters) and the height of the ridge beam.

Therefore, the correct calculation integrates all these variables, which is why the formula includes the height at the plate, total rise, ridge drop, and the ridge beam height. This ensures that the temporary supports are accurately positioned to accommodate the actual geometry of the roof being constructed.