The room size will vary depending on the width and slope of the truss.
Roof truss sizes uk.
To use the truss form existing roof dimension calculator.
This sizing guide for roof rafters will help determine what you need for your small project.
Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.
There are several variables to consider when determining the proper rafter size.
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.
The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction.
Multiply multiply 2 1 by 2 1 to get 4 41 and 1 2 by 1 2 to obtain 1 44.
Adding 4 41 ans 1 44 gives 5 85 and the square root of 5 85 is 2 42 8 06 feet.
Enter your existing heel size or rafter size.
These trusses are used when habitable space is required within the room zone.
This is the minimum length of the outer board of your roof truss.
Meanwhile the 46mm thickness option is used for attic trusses due to fire regulation guidelines.
The tool will calculate the missing field.
Spaced sheathing or 1x boards may be reduced slightly.
Spans for 2x4 top chord trusses using sheathing other than plywood e g.
Pitched roof timber sizes.
35mm standard roof truss.
The truss is a framework consisting of rafters posts and struts which supports your roof.
All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.
A gambrel room in attic truss also provides extra living space while giving your roof a barn like appearance.
01706 212 238 northern 01785 282 833 midlands northern office.
Add it to the square of the result obtained in step 2.
To find out more about our roof trusses call our team on.
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.
Square the result obtained in step 1.
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.
We usually opt for the 35mm thickness in timber when designing standard roof trusses.
The standard roof truss used for the majority of new build houses across the uk.
Enter two of the span height pitch fields.
These trusses can also be used for garages and extensions as well as self build projects.
This could be for fink trusses in a house construction or queenpost trusses for a garage.
