Surveyors’ span tables for designing roof rafters
for pitched roofs, flat roofs and ceiling joists
Surveyors and structural engineers utilise data from tables below to help calculate the correct size, strength and centres of roof timbers for the required spans and loadings.
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PITCHED ROOF RAFTERS
Rafter spans C24 strength class timber
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Purlins – span tables
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Ceiling joists – span tables
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Ceiling binders – span tables
FLAT ROOF JOISTS
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