![]() This article will focus on how simple beams like joists and rafters react to loading. If, when the loads of the house are combined, the house weighs more than the soil can support – the house will sink until it reaches a point at which the soil can support the load. Remember when your science teacher said: every action has an opposite and equal reaction? Well every building load has an equal “reaction load”. ![]() The structural goal of a house is to safely transfer building loads (weights) through the foundation to the supporting soil. A complete analysis of wood’s mechanical properties is complex, but understanding a few basics of lumber strength will allow you to size joists and rafters with the use of span tables. Wood is naturally engineered to serve as a structural material: The stem of a tree is fastened to the earth at its base (foundation), supports the weight of its branches (column) and bends as it is loaded by the wind (cantilever beam). For additional information such as handling, environmental considerations and material compatibility, refer to the Stratco ' Selection Use and Maintenance' brochure.Using span tables to size joists and rafters is a straight-forward process when you understand the structural principles that govern their use. Stratco Ceiling Battens are not to be walked on. Refer to Stratco for applications in higher wind conditions.įor additional information such as handling, storage, environmental considerations and material compatibility refer to the Stratco ' Selection Use and Maintenance' brochure.įasten the ceiling batten at every support with a 10x25mm timber fixing screw (minimum fixing size) through each flange as shown below.įasten the ceiling batten at every support using a 10x16mm hex-head self-drilling screw (minimum fixing size) through each flange as shown below.įasten the plasterboard to the ceiling batten according to the plasterboard manufacturer’s specifications, refer to the figure below for an example. Roofing battens are suitable for non-cyclonic conditions up to and including W41 (N3). If additional fall protection is required on steel sheet roofs, Stratco Ceiling Battens may be fixed intermittently between Stratco Roofing Battens giving a batten spacing no greater than 600mm. The overlap must be supported over a truss or rafter, refer to the figure below. To minimise cutting, lay the battens in one direction starting from one end of the roof. Stratco Ceiling Battens are supplied in 6100mm lengths for easy handling and storage.įasten the batten to every truss or rafter with a 12x40mm timber fixing screw (minimum fixing size) through each flange as shown below.įasten the batten to every truss or rafter with a 10x16mm hex-head self-drilling screw (minimum fixing size) through each flange as shown below.įasten the roof sheets to the batten as per the appropriate Stratco roofing specifications.įix through the ridge flashing into the roofing batten as shown below, using the appropriate cladding screws. ![]()
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