Roof Truss Sizes Uk

Adding 4 41 ans 1 44 gives 5 85 and the square root of 5 85 is 2 42 8 06 feet.

Roof truss sizes uk.

The standard roof truss used for the majority of new build houses across the uk. To find out more about our roof trusses call our team on. Add it to the square of the result obtained in step 2. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. Multiply multiply 2 1 by 2 1 to get 4 41 and 1 2 by 1 2 to obtain 1 44. 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. These trusses can also be used for garages and extensions as well as self build projects.

600 timber thickness mm. The room size will vary depending on the width and slope of the truss. This is the minimum length of the outer board of your roof truss. Gable room in attic trusses provide an economical way to add extra living space to your home or garage.

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your chosen supplier. Trusses must be designed for any special loading such as concentrated loads from hanging partitions or air conditioning units and snow loads caused by driftingnearparapetorslide offfromhigherroofs. Spans for 2x4 top chord trusses using sheathing other than plywood e g.

To use the truss form existing roof dimension calculator. 35mm standard roof truss. 01706 212 238 northern 01785 282 833 midlands northern office. The truss is a framework consisting of rafters posts and struts which supports your roof.

Enter your existing heel size or rafter size. A gambrel room in attic truss also provides extra living space while giving your roof a barn like appearance. Pitched roof timber sizes. Meanwhile the 46mm thickness option is used for attic trusses due to fire regulation guidelines.

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. Square the result obtained in step 1. This sizing guide for roof rafters will help determine what you need for your small project. These trusses are used when habitable space is required within the room zone.

Spaced sheathing or 1x boards may be reduced slightly. Enter two of the span height pitch fields. We usually opt for the 35mm thickness in timber when designing standard roof trusses. The tool will calculate the missing field.