Flat Roof Roof Joist Span Calculator Uk

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 roof joist span calculator uk.

This table uses commonly available uk regularised timber depths. What is the standard pitch for a roof. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. Surveyors span tables for designing roof rafters. 1 enter joist details 1 1 span and joist spacing. 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 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. For pitched roofs flat roofs and ceiling joists. The full version allows any size. These spans were calculated using our flat roof joist calculation engine.

Suitable for uk building regulation approval. This is the distance between joist centres. Contemporary houses often have flat roofs which shouldn. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. This demo version is fixed at 1m clear span. Flat roof joist calculator.