RAFTER SPACING FOR METAL ROOF AUSTRALIA FULL

Broken hip: The Broken hip connects ridge boards when they are at different levels as a result of differing building spans.Roof struts: Roof struts transfer the roof load encountered by the under purlins to beams, which then transfer the load to walls.Under purlins: Under purlins are horizontal members that lie perpendicular to the roof slope and are positioned under the rafters to help avoid the roof sagging.It ensures all rafters meet at the same level and are sloping at the same angle. Ridge board: Ridge board is a horizontal member, usually positioned in the centre of the roof span, that the top ends of rafters connect to.A Valley Rafter: A Valley Rafter is similar to a hip rafter except the end connecting to the ridge board can join anywhere along with the ridge board, not just the end.Hip Rafter: A Hip Rafter is a member that is connected to the end of the ridge beam, and diagonally extends and slopes towards the intersection between two wall top plates.The other end is still connected to the ridge board. Valley Creep Rafter: Valley Creep Rafter is like a creeper rafter except one end is connected to a valley rafter rather than nothing. Decra Roofing System is made out of BlueScope Steel of Australia coated with.Creeper Rafters: Creeper Rafters are essentially common rafters, except they meet at a hip rafter rather than the ridge board, thus making them variably shorter.Cripple creeper Rafter: A Cripple creeper Rafter is a rafter where one end connects to a broken hip and the other to a valley rafter.Usually, at both ends of the ridge board, they serve as bracing to strengthen the roof frame. Jack or Crown End Rafters: Jack or Crown End Rafters are members that are fitted to the ends of the ridge board and slope down to match the other rafter slopes.Common Rafters: Common Rafters are members that are typically erected in pairs, meet at the ridge board of the roof, run in the same direction as the roof slope, and support the roof.

Batten spacing: 1200mm maximum: Option 1.

Collar ties: Collar ties are horizontal members that are fitted to pairs of rafters to stop them from spreading apart. The following roof batten splicing details are recommended to adequately provide lateral restraint to the roof truss top chords for all metal sheet roofs.

They also serve as the floor framing for the level above or attic.

Ceiling joists: Ceiling joists are horizontal framing members that support the load of the ceiling whilst concurrently stopping the wall frames from bowing out or falling in/outwards.

RAFTER SPACING FOR METAL ROOF AUSTRALIA FULL

The top plate: The top plate is a beam that runs the full length atop the walls and is used to support the roof, transferring the forces from the roof to the structure’s frame and into the foundations.

Rafter spacing for metal roof australia