Roof Truss Thickness

Building roof trusses for your home.

Roof truss thickness.

The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. The typical thickness range for sheathing is 3 8 to 3 4 inch. Fine thatching grass or reed should have a 1 2 2 5 mm stem butt diameter. Pitched roof timber sizes.

This free online truss and roof calculator generates the axial forces and reactions of completely customisable 2d truss structures. Sheathing should be a minimum of 19 32 inch thick. This could be for fink trusses in a house construction or queenpost trusses for a garage. This rafter truss calculator has a range of applications including being used as a wood truss calculator roof truss calculator roof rafter calculator scissor truss calculator or for roof framing.

This is the right way to fix truss clips connecting the rafter and wall plate. Overview of trusses use of trusses in buildingtrusses are used in a broad range of buildings mainly where there is a requirement for very long spans such as in airport terminals aircraft hangers sports stadia roofs auditoriums and other leisure buildings trusses are also used to carry heavy loads and are sometimes used as transfer structures. Roof sheathing standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction.

We usually opt for the 35mm thickness in timber when designing standard roof trusses. If rafter construction is used instead of roof trusses and the roof covering is regular sheeting or tiles. Never attach roof sheathing with staples. Roof truss factors to consider.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Structural engineers certify and design roof trusses. When it comes to using osb or plywood for gussets vogt says that osb is more commonly used. The sizes of the wood used range from 2 6 and 2 8 even though its thickness can be based on the weight that it will support and the overall size of the roof.

The thickness of the material used for the gusset also affects the span rating that is how far apart the trusses can be spaced along the roof. 8d ring shank nails should be used instead.