Structural timber span tables
It is vital that the correct structural timber is used for your structure.
Please note that the following graphs are provided as information only.
We accept no liability for the use of these graphs.
We recommend that a structural engineer assists in the design of timber structures.
Somerset Timbers Joist span table for decking and flooring – summary for S5 Pine and Garde 8 Laminated beams.
Detailed graphs for flooring:
SA Pine 22mm flooring must be supported every 450mm.
Detailed graphs for roofing:
Consult with your roof sheeting supplier to determine the correct purlin spacing.
A number of factors determine roof construction design: Weight of ceiling, beams, insulation, windows. Wind loading. Roof pitch etc.
Basic truss design tables: