Timber Roof Truss Thickness

Maximum truss spans for rafter and tie beams a heel joints should have 2 x m12 bolts per joint with 40 mm washers at each end b all timber members should have a thickness of 38 mm or 36 mm if the timber is planed c 38 mm x 114 mm grade 7 members may be substituted for 38 mm x 152 mm grade 5 material if required.

Timber roof truss thickness.

Diy building kitchen deco and garden hypermarket offering the best prices and range. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. We usually opt for the 35mm thickness in timber when designing standard roof trusses.

Meanwhile the 46mm thickness option is used for attic trusses due to fire regulation guidelines. Learning how to install roof trusses for a garage roof isn t hard particular if you follow particular hints and tips. All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your. Pitched roof timber sizes.

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. 600 timber thickness mm. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. This could be for fink trusses in a house construction or queenpost trusses for a garage.

Free returns in store. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5 9 72 tr26 wb 4 8 4 9 72 tr26. Choosing other roof structures with timber trusses has already become the standard choice for building construction especially for residential buildings. The truss is a framework consisting of rafters posts and struts which supports your roof.

A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay. There are several variables to consider when determining the proper rafter size. This sizing guide for roof rafters will help determine what you need for your small project. The first thing you should do when building roof trusses is to cut timber panels to the garage roof s size.