Roof Truss Sizes Uk

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.

Roof truss sizes uk.

There are several variables to consider when determining the proper rafter size. Adding 4 41 ans 1 44 gives 5 85 and the square root of 5 85 is 2 42 8 06 feet. To find out more about our roof trusses call our team on. The tool will calculate the missing field.

Square the result obtained in step 1. 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. 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. Pitched roof timber sizes.

01706 212 238 northern 01785 282 833 midlands northern office. Spaced sheathing or 1x boards may be reduced slightly. Meanwhile the 46mm thickness option is used for attic trusses due to fire regulation guidelines. The truss is a framework consisting of rafters posts and struts which supports your roof.

This is the minimum length of the outer board of your roof truss. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. Enter two of the span height pitch fields. 35mm standard roof truss.

These trusses are used when habitable space is required within the room zone. To use the truss form existing roof dimension calculator. A gambrel room in attic truss also provides extra living space while giving your roof a barn like appearance. 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.

600 timber thickness mm. These trusses can also be used for garages and extensions as well as self build projects. Gable room in attic trusses provide an economical way to add extra living space to your home or garage. This could be for fink trusses in a house construction or queenpost trusses for a garage.

Multiply multiply 2 1 by 2 1 to get 4 41 and 1 2 by 1 2 to obtain 1 44. We usually opt for the 35mm thickness in timber when designing standard roof trusses. The room size will vary depending on the width and slope of the truss. The standard roof truss used for the majority of new build houses across the uk.

Enter your existing heel size or rafter size. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Spans for 2x4 top chord trusses using sheathing other than plywood e g.