Calculation basis for the permissible clear span of solid timber purlins used in traditional pitched roof construction, i.e not including trussed rafter roofs.Cross References:BS 648BS 4471BS 4978BS 5268:Part 2 BS 5268:Part 3BS 5268:Section 7.1BS 6100:Section 2.1BS 6100:Section 4.1BS 6100:Section 4.2BS 6100:Section 4.3BS 6100:Section 4.4BS 6399:Part 1BS 6399:Part 3ISO 3898CIB-W18-1
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