What spacing should roof rafters be?
Roof rafters are commonly set at 400mm or 600mm centres, with the right spacing driven by the rafter size, span, roof load and tile weight.
Rafters are usually spaced at 400mm or 600mm centres. The choice depends on the span, the size of the rafter and the weight of the roof covering, since heavier tiles need closer support.
The correct combination of rafter size and spacing comes from span tables and the structural design for the roof, so treat these as typical figures only.
Otis works out rafter and batten quantities from the roof dimensions, checks stock and prices the timber and fixings for the account.
General guidance for the trade. Always follow current Building Regulations, manufacturer instructions and the specifics of the job.
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