Purlin Calculator

Calculations to BS 5268-2: 2002 & BS 5268-7.6: 1990

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

1 Enter Purlin Details

1.1 Span, slope, purlin and rafter spacing

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

Purlin spacing on slope
Rafter slope (min 15, max 45)
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Rafter width ↔
Rafter depth ↕
Rafter spacing
This is the distance between rafter centres. Usually 400, 450 or 600mm, but any value can be used up to 610mm max

1.2 Purlin

1.3 Timber strength class

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

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