Alterations resulting in the addition of load eg HVAC equipment water heater

Alterations resulting in the addition of load eg hvac

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Alterations resulting in the addition of load (e.g. HVAC equipment, water heater, water tank etc.), that exceeds the design load for the truss shall not be permitted without verification that the truss is capable of supporting the additional loading. 7.2.3 Floor sheathing 7.2.3.1 Sheathing thickness The thickness of lumber used as floor sheathing shall conform to the requirements of Table 7-6 . Table 7-6 Minimum thickness of floor sheathing Minimum net thickness mm Joist or beam spacing mm Perpendicular to joist Diagonal to joist 400 16 16 600 19 19
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PCTTS 599: 20XX 134 Plywood continuous over two or more spans shall have the grain perpendicular to supports. Unsupported edges shall be tongue and gr oove or blocked. End jointing in lumber used as flooring shall occur over supports. 7.2.3.2 Materials 7.2.3.2.1 Wood structural panel sheathing Wood structural panel sheathing used for structural purposes shall be identified by a grade mark or certificate of inspection issued by an approved agency. 7.2.3.2.2 Particleboard Particleboard shall conform to ANSI A208.1 and shall be so identified by a grade mark or certificate of inspection issued by an approved agency.
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PCTTS 599: 20XX 135 8 Roof assemblies 8.1 Roof structure 8.1.1 Concrete Concrete roof structures shall be designed and constructed in accordance with the requirements for suspended concrete floor slabs (see clause 7.1.3) with the appropriate loading for roofs. 8.1.2 Timber 8.1.2.1 Framing 8.1.2.1.1 A timber roof may be constructed as a gable roof, a hip roof or a mono (lean-to) roof. 8.1.2.1.2 The gable roof consists of a structural frame made up of a ridge board and rafters. The minimum sizes of members for gable or mono-pitched roofs shall be as follows: a) 25 mm × 150 mm for the ridge board; and b) 50 mm × 100 mm for the rafters spaced at 800 mm between centres. 8.1.2.1.3 In the case of the hip roof, hip rafters are introduced into the structural frame; the minimum size of the hip rafters shall be 50 mm × 150 mm. Figure 8-1 shows a typical hip roof layout. 8.1.2.1.4 Tables 8-1 and 8-2 give the recommended sizes for main members constructed of pitch pine. These recommended sizes may be applied to timber other than pitch pine provided that the timber used is of a greater mechanical strength. It is recommended that p rofessional advice be obtained if weaker timber is to be used or if smaller sizes of stronger timber are to be used. See Table 4-4 for information on different types of timber. 8.1.2.2 Fixings 8.1.2.2.1 The rafters shall be securely fixed to the ring beam at the top of the walls on a wall plate and to the ridge board at the crown of the roof. The use of patented hurricane clips (rafter ties) for fixing rafters to plates, purlins and ridge boards shall be used. See Figures 4-9 and 4-11 for some typical fixing details.
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