![]() Joists supporting additional loads should be calculated by a competent person. These span tables make no additional allowance for water tanks or any other additional loads. ![]() These span tables are based on the imposed loads given in BS 5268-7.1 and BS 6399-1, with an imposed uniformly distributed load of 0.25kN/m² acting together with a concentrated (point) load of 0.9 kN. Rafter Span Tables - Use these tables to determine the maximum span of a rafter, given the size, spacing, species, and grade of lumber. ![]() Joists are to have minimum end bearing of 40mm. Wane as allowed in BS 4978:2007+A2:2017 is permitted in all sections included in these span tables. Free UK Span Tables for Rafters to BS 5268-7.5 - Timber Beam Calculator Span tables Rafters Span Tables for Rafters (to BS 5268-7.5) Imposed loads of 0. Timber to be covered, these span tables do not apply to timber which is fully exposed to the elements. Holes and notches cannot be drilled or cut into the joists unless proved adequate by specialist calculations. These span tables do not apply to ties of trussed rafters.Ĭeiling joists may be continuous or made up of shorter lengths joined at intermediate supports such as binders. Example: For instance, if you have a rafter span of 20 feet, a snow load of 30 psf, and a roof pitch of 6 in 12, input these values, click Calculate, and the result. Click the Calculate button to get the recommended ridge beam size in inches instantly. The dead loads shown at the top of span table above do not include the self weight of the joists, however, the joist self weights are included (in addition to the dead loads) in the calculations used to determine permissble clear spans. Enter the roof pitch in inches per foot (in 12) in the appropriate input field. The lowest is a plain ceiling joist with no storage (10 pounds per square foot). What size wood beam will span 12 feet A double 2x12 beam could potentially span 12 feet, but this also depends on the load it needs to carry. For 2圆 rafters, this would be around 5.5 inches. The allowable clear spans have been calculated in accordance with BS 5268-2:2002 Structural use of timber - Part 2: Code of practice for permissible stress design, materials and workmanship and BS 5268-7.3:1989 Structural use of timber - Section 7.3 Ceiling joists. Span Options Calculator for Wood Joists and Rafters. The minimum distance is typically the width of the lumber used for the rafters. * Boarding to be fastened on top of ceiling joists with a depth to width ratio greater than 4 Dead load per square metre (in kN/m²) supported by joistsĬentre-to-centre spacing of joists (in mm)
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