Flat Roof Roof Joist Span Calculator Uk

For pitched roofs flat roofs and ceiling joists.

Flat roof roof joist span calculator uk.

1 enter joist details 1 1 span and joist spacing. These spans were calculated using our flat roof joist calculation engine. Suitable for uk building regulation approval. This demo version is fixed at 1m clear span.

This is the distance between joist centres. 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. There is no standard universal roof pitch roof pitch varies depending on culture climate style and available materials in the usa the range of standard pitches is anywhere between 4 12 and 9 12 in the uk the typical house has a pitch between 40 50 although 45 should be avoided. Flat roof joist calculator.

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. The full version allows any size. Contemporary houses often have flat roofs which shouldn. What is the standard pitch for a roof.

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. 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. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. This table uses commonly available uk regularised timber depths.

Read the notes at the bottom of the table for assumptions references and related standards. Surveyors span tables for designing roof rafters. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.