Flat Roof Joist Spans Uk

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.

Flat roof joist spans uk. Roof trusses mitek manufactures the steel connector plates used in roof trusses. Most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. For timber floors between homes. Check out the benefits of roof trusses and find a licensed mitek fabricator.

This span table is to the format and methodology given in bs 5268 7 2. Click on a span to generate a full calculation you can adjust the exact span. Span is clear span between supports. Posi rafters posi rafters combine the lightness of timber and strength of posi strut steel webs to provide a quality roof system that can span further than alternative timber products.

Span tables for ceiling joists to bs 5268 7 3 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. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. For pitched roofs flat roofs and ceiling joists. Maximum slop3 10 deg.

The section sizes are based on regularised als or cls timber. Joist breadth 47mm. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load. Span tables for solid timber joists.

Joist spans 2 5m to 4 5m provide strutting at mid span joist spans over 4 5m provide 2 rows of strutting at third span positions solid timber strutting to be at least 38mm thick and be a minimum of three quarters of the joist depth. Supporting imposed load for access and repair only. Floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. Tables 1 and 2 in this chapter are derived from the trada technology ltd.

Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice.