Timber Roof Joist Span Tables Uk

Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m 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.

Timber roof joist span tables uk.

Span tables span tables can be used to determine the size of a timber member of a particular strength class required for a given span. Floor joist span tables for surveyors floor construction. Timber floor joists shall be adequate for the spans and loads and be correctly installed. They also tell you what the maximum spacing should be between each section or timber member.

Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings. Free uk span table for flat roof joists to bs 5268 7 2 c16 1 5 kn m load timber beam calculator permissible clear spans for flat roof joists to bs 5268 7 2. Solid timber joist sizes are provided in the bs 8103 3 span tables. Also available for the android os.

Other span tables are based on. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. The weight of the timber floor itself consists of the timber joists the plasterboard ceiling underneath it except for suspended timber ground floors the floorboards and the nails or screws used to fix both of the aforementioned coverings. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size.

This is the distance between joist centres. Flat roof joists rafters purlin. Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Span calculator for wood joists and rafters also available for the android os. This table uses commonly available uk regularised timber depths.