* Two additional joists required Service class 1 or 2. Imposed load not exceeding qk = 1.5 kN/m2 or qk = 0.90 kN. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. Partitions may be directly supported by one or two additional joists. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. You need to measure the complete span of your floor joists, together with the distance between them (the ‘centres’) and the size of the timbers. For all other additional loads, joist sizes should be designed by an engineer in accordance with Technical Requirement R5. use the three right-hand columns from Tables 1 and 2. a dead load of between 0.25kN/m2 and 0.5kN/m2 may be assumed. The following span tables are indicative of some of the spans required for domestic floor joists where C16 and C24 strength classes are used. This span table is to the format and methodology given in BS 5268-7.2. Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. Bold text = normal bearing of 40mm to be doubled. Adherence to the approach outlined in a Technical Guidance Document is regarded, as evidence of compliance with the requirements of the relevant part of the Building Regulations. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Where the tables do not apply, or where there are concentrated loads, floor joists should be designed by an engineer in accordance with Technical Requirement R5. use the centre three columns from Tables 1 and 2. See the notes below the span tables for details. To check a span and see a range of suitable Posi-Joist specifications visit www.mitekposi.co.uk to use our interactive span tables. literature for span tables for engineered products Sample span tables The following span tables are indicative of some of the spans required for domestic floor joists where C16 and C24 strength classes are used. They refer to a dead load of not more than 0.5kN/m 2 (excluding the weight of the joist) and an imposed load not exceeding 1.5 kN/m 2 . Solid timber joist sizes are provided in the BS 8103-3 span tables. Builders' Book - An illustrated guide to building energy efficient homes, Robust details Ltd - Timber I Joist sealant animation, Robust details Ltd - Timber solid joist sealant animation, Technical Extra 06 - Long span profile decking composite floors, Technical Extra 10 - Code of practice for the safe installation of precast concrete flooring and associated components, Technical Extra 10 - The British Woodworking Federation Stair Scheme, Technical Extra 11 - Audible cracking noises in intermediate floors, Technical Extra 15 - Audible cracking noises in intermediate floors, Technical Extra 18 - Provision of lateral restraint straps for low-rise residential buildings, Technical Guidance - Bolt fixing of multiple joists, Technical Guidance - End support to chipboard flooring, Technical Guidance - Lateral restraint straps to beam and block and precast or prestressed intermediate floors, Technical Guidance - Noggings for lateral restraint straps, Technical Guidance - Sealing around ends of engineering joists, Technical Guidance - Strutting to floor joists, (including attic trusses), Technical Guidance - Support of joist hangers, Technical Guidance - Support of plasterboard, 2.1 The Standards and Technical Requirements, 3.2.6 Rendering, plastering and screeding, 3.3 Timber preservation (natural solid timber), 4.1 Land quality – managing ground conditions, 4.1.2 Initial Assessment – desk study (all sites), 4.1.3 Initial Assessment – walkover survey (all sites), 4.1.5 Basic Investigation (sites where hazards are not identified or suspected), 4.1.6 Detailed Investigation (sites where hazards are identified or suspected), 4.1.7 Managing the risks (sites where hazards are found), 4.2.4 The effects of trees on shrinkable soils, 4.2.8 Design and construction of foundations in shrinkable soils, 4.2.9 Foundation depths for specific conditions in shrinkable soils, 4.3.8 Sloping ground and stepped foundations, 4.4 Raft, pile, pier and beam foundations, 4.5 Vibratory ground improvement techniques, 4.5.4 Confirmation of suitability for treatment, 4.5.6 Compatibility of the ground, design and treatment, 4.5.12 Verification of completed treatment, 5 Substructure, Ground Floors, Drainage and Basements, 5.1 Substructure and ground-bearing floors, 5.1.18 Laying the ground-bearing floor slab, 5.2.7 Construction of suspended concrete ground floors, 5.2.9 Thermal insulation and cold bridging, 5.3.7 Design to avoid damage and blockages, 5.4 Waterproofing of basements and other below ground structures, 6.3.3 Supporting load-bearing internal walls, 6.3.8 Partitions: internal non load-bearing, 6.3.10 Construction of steel framed partitions, 6.3.11 Construction of proprietary systems, 6.4.6 In-situ concrete floors and concreting, 6.4.11 Joists supported by intermediate walls, 6.4.20 Floating floors or floors between homes, 6.6.12 Staircases made from timber and wood-based products, 6.8.3 Solid fuel – fireplaces and hearths, 6.9.11 Electrical continuity and earth bonding, 6.9.19 Insulated render and brick slip cladding, 6.10.4 Structural design of load-bearing floors and walls, 6.10.10 Construction of load-bearing walls and external infill walls, 6.10.12 Fixing floor decking and ceilings, 6.10.20 Cladding, lining and sheathing boards, 7.1.7 Thermal insulation and vapour control, 7.1.8 Waterproofing and surface treatments, 7.2.10 Strutting for attic trusses and cut roofs that form a floor, 7.2.15 Ventilation, vapour control and insulation, 8.1.7 Electrical services and installations, 8.2.11 Electrical installation requirements, 8.2.12 Pipes, insulation and protection from cold, 8.3 Mechanical ventilation with heat recovery, 9.1.7 Ceramic, concrete, terrazzo and similar tile finishes, 9.3.5 Ceramic, concrete, terrazzo and similar tile finishes, 9.4.3 General provisions – cupboards and fitments, 9.4.6 Airing cupboards, cupboards, worktops and fitments, 9.4.7 Ironmongery, prefabricated items and other materials, 9.5.4 Conditions for painting and decorating, 10.1.10 Permanent prefabricated garages and carports, 10.2.4 Freestanding walls and retaining structures, 10.2.8 Garden areas within 3m of the home, to meet acoustic performance, the dead load of the construction is likely to be 0.6-0.7kN/m2. 0.90 kN amended version of BS 6399-1 all steel systems be fixed the! 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