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.
Click for STRUCTURAL DESIGN CALCULATIONS
PITCHED ROOF RAFTERS
Rafter spans C24 strength class timber
FLAT ROOF JOISTS
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Flat roof joists – Strength Grade C24 timber