The Purlins for a Hip Roof calculator computes the total number and length of purlins (roof support boards) for a hip roof based on the ridge length of the roof, the roof pitch and the span of the roof.
INSTRUCTIONS: Choose units and enter the following:
- (L) Roof Length
- (S) Roof Span
- (oH) Overhang
- (P) Roof Pitch
- (PoC) Purlin On-center spacing (default: 24")
Purlins for a Hip Roof (nP): The calculator returns:
- (nR) Number of Rows of Purlins
- (TPL) Total Length of Purlin Boards
- (FRi) Length of each row on the Faces (below ridge)
- (HRi) Length of each row on the Hips
Purlins and Girts
Purlins are rows of boards nailed horizontally to a roof's frame to act as a base for surface materials such as a metal roof panels. Purlins are usually nailed but sometimes screwed to rafters or trusses and spaced in horizonal rows. The metal roofing panels are then screwed onto the purlins vertically forming the roof up to the ridge cap and down to the drip edge of the overhang.
Girts are like purlins and used on walls to be the base of metal panels for siding. Girts are horizontal boards nailed or screwed to vertical posts or studs, and they are used as the support structure to vertical wall panels such as metal siding. Girts are often 2x6 boards.
Purlin and Girt Calculators
- Purlins for a Gabled Roof
- Purlins for a Gambrel Roof
- Purlins for a Hip Roof
- Purlins for a Pyramid Roof
- Purlins for a Shed Roof
- Purlins and Girts for a Shed
- Girts for a Building
Roof Types
