![]() ![]() All this is considered within your pack, designed to meet the unique requirements of your individual project. ![]() If in doubt then steel supports should be used. In certain cases where load-bearing walls are available, it is sometimes possible to utilise these walls to support the new timber floors. Our loft conversion pack will include all the steel beams required to support the new/modified structure, using our specific formula for beam calculations for loft extensions. If your loft conversion includes the addition of a dormer window, steel beam supports are usually required at this location in the form of a structural ridge beam. In addition to this requirement, the new steel beams afford the modified roof support via eaves partitions. In all but a very few cases, steel beams are required to carry the new floor where load-bearing walls are not available. Structural Calculations for Loft Conversions – Steel Beam & Beam Bearing/Pad Stone Calculations This ensures the safety of your new structure.Īll of our structural timber elements have deflection limited to 14mm maximum to control cracking of brittle finishes, another necessity addressed in your pack. Using the correct beam calculations for loft extensions enables you to get the job done right first time and in a way that meets the building regulations. ![]() This is why it’s important to get your initial plans right. The section size used is dependent on the spans and the spacing’s of the joists, as bending, shear and deflection will all need to be considered. Generally, the new floor structure will be formed with C16/C24 strength graded timbers. Due to new building regulations, specifically brought in to improve safety and performance, a new floor structure needs to be provided in the loft space. If your building is historic, there is a good chance they were sized with empirical rules of thumb, an outdated and generally unreliable method. This figure is calculated as a dead load and a storage live load. Generally, these will have been designed to carry their own self-weight and a plasterboard/lath plaster finish. Existing Ceiling ExampleĪs shown in the example above, existing ceiling joists are designed to withstand a much lighter load than a domestic floor load. This information is all contained in your essential loft conversion structural pack, including your beam calculations for loft extensions. It is standard building practice, and a building regulation requirement, that joists supporting partitions and baths are doubled. Any floor joists supporting dormers or partitions may need to be designed as timber beams. In addition to the new floor joists, trimmer joists will be required around the new stair aperture. This design provides you with the vital plan you need to create a structure capable of carrying the new increased domestic floor loads and existing ceilings. The pack will contain a new floor design, which we create using our innovative beam calculations for loft extensions. However, using our loft conversions structural pack, this shouldn’t cause you too much of a headache. When you’re carrying out your planned loft conversion, it’s highly likely you’ll find that the existing ceiling joists or gang-nailed roof truss chords in your property are not designed to carry a full domestic floor load. Timber Loft Floor Joist Calculations & Trimming Joists Our Loft Conversion Structural CalculationS Includes Full Design and Appraisal of the Following Structural Elements: ![]()
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