Thank you, we really appreciate your help. Click on a span to generate a full calculation (you can adjust the exact span). Note: Our floor joist span tables are based on loadings given in the newer, amended version of BS 6399-1. use the centre three columns from Tables 1 and 2. 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 . For all other additional loads, joist sizes should be designed by an engineer in accordance with Technical Requirement R5. Other span tables are based on the guidance given in BS 5268-7.1 which is a uniformly distributed load of 1.5kN/m² for spans greater than 2400 mm and 3.6 kN load per metre width of floor for spans less than 2400 mm to ensure that very small joist sizes do not result from the calculations for smaller spans. This Design Notes section shall be read in conjunction with Boxspan Residential Span Tables – Non Cyclonic Areas publication. Bold text = normal bearing of 40mm to be doubled. Where similar lightweight partitions run at right-angles to the joists, the maximum spans in Tables 1 and 2 should be reduced by 10%. Table R502.3.1(1) shall be used to determine the maximum allowable span of floor joists that support sleeping areas and attics that are accessed by means of a fixed stairway in accordance with Section R311.7 provided that the design live load does not exceed 30 pounds per square foot (1.44 kPa) and the design dead load does not exceed 20 pounds per square foot (0.96 kPa). Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. Partitions should be fixed through the floor decking into the joist(s) beneath. Imposed loads of 0.75 kN/m² 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), Imposed loads of 1 kN/m² for maintenance and snow load are applicable where there is no permanent access (no fixed ladder or staircase) and most areas where the altitude exceeds 100 metres but does not exceed 200 metres, but excluding parts of Scotland, Pennines, North East England (refer to BS 6399-3), Imposed loads of 1.5 kN/m² are applicable where there is permanent access to the flat roof. 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. Service class 1 or 2. They refer to a dead load of not more than 0.5kN/m2 (excluding the weight of the joist) and an imposed load not exceeding 1.5 kN/m 2.
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