Flat Roof Joist Sizes Trada

Not more than 0 5 more than 0 5 but not more than 0 75 more than 0 75 but not more than 1.

Flat roof joist sizes trada.

Permissible clear span metres. The partitions should be fixed through the floor decking into the joist s beneath. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. The construction of the flat roof is similar to that of the timber upper floor.

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. For timber floors between homes. Part 1 introduction contents list of tables and preface.

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition. Contains section sizes and spans for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings. Surveyors span tables for designing roof rafters. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

Dead load per square metre in kn m supported by joists. Size of joists mm clear span c16 joist m clear span c24 joist m 47 x 95 47 x 120 47 x 145 47 x 170 47 x 195 47 x 220 1 77 2 40 2 89 3 38 3 87 4 36 2 04 2 75 3 47 4 20 4 93 5 66 floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. Flat roof joists rafters purlin span tables for domestic floor joists to bs 5268 7 1 note. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.

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 section sizes are based on regularised als or cls timber.