Flat Roof Joist Spans Uk

Roof trusses mitek manufactures the steel connector plates used in roof trusses.

Flat roof joist spans uk.

Floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. 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. Supporting imposed load for access and repair only. 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.

Tables 1 and 2 in this chapter are derived from the trada technology ltd. 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. Span tables for solid timber joists. Permissible clear spans for flat roof joists to bs 5268 7 2 find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.

Maximum slop3 10 deg. 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. 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.

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Surveyors span tables for designing roof rafters. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load. This span table is to the format and methodology given in bs 5268 7 2.

Joist breadth 47mm. Click on a span to generate a full calculation you can adjust the exact span. At least 40mm bearing on supports. Check out the benefits of roof trusses and find a licensed mitek fabricator.

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.