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C16 Span Table - Domestic Flat Roof Joists. Access for maintenance and repair only. Imposed load not exceeding q = 1.02 kN/m2 or Q = 0.9. k k kN. flat roof joists of solid timber for specified loadings, sizes and spacings.
Span Tables for Flat Roof Joists (to BS 5268-7.2) Imposed loads of 0.75 kN/m² for maintenance and snow load are applicable where there is no permanent access (no fixed ladder or staircase) and most areas where the altitude does not exceed 100 metres (refer to BS 6399-3)
The above table provides a general summary of common permissible clear spans of flat roof joists of solid timber for specified loadings, sizes and spacings. The table is solely for guidance on the loadbearing capacity of solid timber members, and cannot be adapted for hardwoods or engineered timber products.
Find the column for your dead load and spacing, and the row for your timber size to find the permissible clear span in metres. Click on a span to generate a full calculation (you can adjust the exact span). This span table is to the format and methodology given in BS 5268-7.2.
SPAN TABLES FOR JOISTS AND RAFTERS 1 AMERICAN WOOD COUNCIL EXPLANATION OF TABLES 1. SCOPE hese span tables for joists and rafters are calculated T on the basis of a series of modulus of elasticity (E) and bending design values (F b). Additionally, compression perpendicular to grain design values (F c⊥) are included
Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. They also tell you what the maximum spacing should be between each section or timber member.
The JJI-Joist system is available from a network of authorised distributors throughout the UK and Ireland, who offer an estimating and design service inclusive of JJI-Joist layout plans, engineering calculations and material costings. 2. Engineered wood components. JJI-Joists. oriented strand board web. Four flange widths are available .
