This is the minimum length of the outer board of your roof truss.
Roof truss sizes uk.
These trusses can also be used for garages and extensions as well as self build projects.
The truss is a framework consisting of rafters posts and struts which supports your roof.
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.
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.
To use the truss form existing roof dimension calculator.
Multiply multiply 2 1 by 2 1 to get 4 41 and 1 2 by 1 2 to obtain 1 44.
This could be for fink trusses in a house construction or queenpost trusses for a garage.
There are several variables to consider when determining the proper rafter size.
Spaced sheathing or 1x boards may be reduced slightly.
The standard roof truss used for the majority of new build houses across the uk.
All truss images are for visual aid only and may not truly represent the roof truss supplied or designed by your chosen supplier.
To find out more about our roof trusses call our team on.
Enter your existing heel size or rafter size.
01706 212 238 northern 01785 282 833 midlands northern office.
We usually opt for the 35mm thickness in timber when designing standard roof trusses.
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.
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.
Adding 4 41 ans 1 44 gives 5 85 and the square root of 5 85 is 2 42 8 06 feet.
Pitched roof timber sizes.
All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.
These trusses are used when habitable space is required within the room zone.
Enter two of the span height pitch fields.
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.
The room size will vary depending on the width and slope of the truss.
600 timber thickness mm.
A gambrel room in attic truss also provides extra living space while giving your roof a barn like appearance.
Spans for 2x4 top chord trusses using sheathing other than plywood e g.
Gable room in attic trusses provide an economical way to add extra living space to your home or garage.
35mm standard roof truss.
Meanwhile the 46mm thickness option is used for attic trusses due to fire regulation guidelines.
