Rafter Calculator

Calculations to BS 5268-2: 2002 & BS 5268-7.5: 1990

The beam span length is fixed for this demo version. The full version allows you to design beams of any size.

1 Enter Rafter Details

1.1 Span, slope and spacing

Is there a purlin supporting the rafters?

This demo version is fixed at 1m clear span. The full version allows any size

Rafter slope (min 15, max 45) Help icon
Rafter spacing
This is the distance between rafter centres. Usually 400, 450 or 600mm, but any value can be used up to 610mm max
Are there any brittle finishes (e.g. plasterboard) on the underside of the rafter?

1.2 Rafter size

or

1.3 Timber strength class

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2 Loadings
Dead load on the slope
Imposed loads (roof snow load and short-term point load)

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