Roof Truss Dimensions Uk

This is the minimum length of the outer board of your roof truss.

Roof truss dimensions uk. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. Adding 4 41 ans 1 44 gives 5 85 and the square root of 5 85 is 2 42 8 06 feet. Meanwhile the 46mm thickness option is used for attic trusses due to fire regulation guidelines.

We usually opt for the 35mm thickness in timber when designing standard roof trusses. These trusses are designed as attic style with larger sections of timber to support additional loadings which allow people to live within the truss zone. 600 timber thickness mm. 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.

The tool will calculate the missing field. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Square the result obtained in step 1. 35mm standard roof truss.

01706 212 238 northern 01785 282 833 midlands northern office. These trusses can also be used for garages and extensions as well as self build projects. The standard roof truss used for the majority of new build houses across the uk. Enter your existing heel size or rafter size.

To use the truss form existing roof dimension calculator. Pitched roof timber sizes. These trusses are used when habitable space is required within the room zone. The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions.

To find out more about our roof trusses call our team on. There are several variables to consider when determining the proper rafter size. Enter two of the span height pitch fields. All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your chosen supplier.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. This sizing guide for roof rafters will help determine what you need for your small project. Add it to the square of the result obtained in step 2.