Flat Roof Roof Joist Span Calculator Uk

1 enter joist details 1 1 span and joist spacing.

Flat roof roof joist span calculator uk.

These span tables are the equivalent of other industry standard span tables and are calculated to the same standards. For pitched roofs flat roofs and ceiling joists. Size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42 47 x 195 4 41 4 31 3 92 47 x 220 5 04 4 85 4 41 75 x 170 4 50. Surveyors span tables for designing roof rafters.

Flat roof joist calculator. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. What is the standard pitch for a roof. Usually 400 450 or 600mm but.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. 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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Suitable for uk building regulation approval.

This is the distance between joist centres. Read the notes at the bottom of the table for assumptions references and related standards. 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. This table uses commonly available uk regularised timber depths.

The full version allows any size. These spans were calculated using our flat roof joist calculation engine. This demo version is fixed at 1m clear span.