![]() Hence, timber rafters are usually constructed in form of A-shape, consisting basically of the rafters, rafter ties, and ridge board/hips. ![]() Trussed rafters are generally employed for large scale timber roof construction, but direct timber rafters are more efficient for small scale constructions. Timber rafters rely on nails or screws for connection. The number of common rafter units needed for each project is mostly determined by the roof’s size and scope, as well as the distance each unit rafter must span. Many common, or general purpose, rafters make up each roof. The common rafters form the sloped sides of the triangle on a traditional gable roof, which has a triangular shape. Rafters are part of a basic wood framing system and are made of wood lumber. Timber rafters are popular options in timber/wooden roof structures. The spacing of rafters can be determined from the design requirements, type of roof sheeting to employed, type and spacing of purlins, availability of materials, etc.įigure 4: Steel portal frame consisting of stanchions and rafters Timber Rafters Furthermore, they are constructed in series and laid parallel to each other at usually a constant spacing. Rafters can be constructed using steel or timber. They are also important members for resisting upward wind pressure on roofs. ![]() They typically run from the ridge board or hip of the roof at a sloping angle to the roof wall plate, columns, or roof beams, depending on the support system adopted for the entire roof structure.īy implication, rafters receive the load from the roof covering/sheeting, accessories, and other services that may be attached to it. You should verify results for yourself, and all calculations should be checked independently.Rafters are loading bearing structural members that are used in roof construction. You should only use these calculators if you have enough knowledge to correctly assess the loads supported by members, the reasonableness of the program output, the overall performance of the structure, and the proposed design's suitability. Our calculators typically undergo weeks or months of beta testing and iteration and, finally, an audit by an independent chartered structural engineer before they are released.ĭisclaimer: All engineering software is based on approximations and standards which can be open to interpretation and can change. We also use our core calculation engines to recreate and compare our results with standard industry tables (such as the Blue Book, Orange Book and timber span tables). We use automated unit tests and end-to-end tests to simulate dozens or hundreds of example calculations covering a wide range of use-cases for each calculator. We also compare our results with other engineering software. These include examples from standards organisations, institutes, trade bodies, and textbooks. We benchmark the calculators against a wide range of sources. Yes, the calculators work in your browser on any internet-connected device, including PCs, Macs and tablets. Will the calculators work on my PC / Mac / Tablet? If you need to use a load that is not in the dropdown menu, select 'other' at the bottom of the list and enter the load details manually. What do I do if I need a load that is not in the dropdown list? UK section properties are provided by Tata Blue Book, European section properties are provided by ArcellorMittal Orange Book.Ĭan I use US standard units / metric units?Īll the calculators use metric units, except the US calculator, which uses US standard units.Ĭalculations can be downloaded or emailed as a PDF file. It also includes UB, UC and PFC sections. Yes, the Eurocode Steel Beam Calculator includes IPE sections and other standard European section sizes. Yes, just take out a monthly subscription and cancel as soon as you've finished.ĭo the steel calculators include European section sizes? I just need a single calculation, is it suitable for me? The calculators are designed for domestic projects. What types of project are the calculators suitable for?
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