72 Timber floor slabs 721 Timber species Lumber for floors shall be selected in

72 timber floor slabs 721 timber species lumber for

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7.2 Timber floor slabs 7.2.1 Timber species Lumber for floors shall be selected in accordance with the recommended use for different species in Table 4-4. 7.2.2 Structural framing 7.2.2.1 Method of construction Figure 7-8 gives details of the method of construction of timber flooring systems. 7.2.2.2 Allowable joist spans Spans for floor joists shall be in accordance with Table 7-3 . Table 7-3 Floor joist span for common lumber species Maximum floor joist spans Joist spacing 50mm x 150mm Joist 50mm x 200mm Joist 50mm x 250mm Joist 50mm x 300mm Joist 300mm 3.3m 4.2m 5.1m 6m 400mm 3.0m 3.6m 4.5m 5.2m 500mm 2.6m 3.3m 4m 4.6m 600mm 2.3m 3m 3.6m 4.2m NOTE The above spans are calculated based on the following: dead load =1.0 KN/m 2 ; live load =1.5 KN/m 2 .
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PCTTS 599: 20XX 129 Figure 7-8 Timber flooring & supports Double joist under bearing partitions Foundation Sill plate Solid blocking Band, rim or header joist Wood structural panel Optional floor finish Bottom wall plate Studs Subfloor or floor sheathing Sill plates Joists pipe in partition Strut
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PCTTS 599: 20XX 130 7.2.2.3 Joists under bearing partitions Joists under parallel bearing partitions shall be doubled or a beam of adequate size shall be provided to support the load. Double joists, which are separated to permit the installation of piping or vents, shall be full depth , solid blocked with lumber not less than 50 mm in nominal thickness spaced not more than 1200 mm on centre. 7.2.2.4 Allowable header spans The allowable spans of headers shall not exceed the values set forth in Tables 7-4 and 7-5 . 7.2.2.5 Bearing 7.2.2.5.1 General The ends of each joist beam or header shall have not less than 50 mm of bearing on wood or metal and not less than 75 mm on masonry or concrete. 7.2.2.5.2 Floor systems Joists framing from opposite sides over a bearing support shall lap a minimum of 75 mm and shall be nailed together. A wood or metal splice with strength equal to or greater than that provided by the nailed lap is permitted. 7.2.2.5.3 Joist framing Joists framing into the side of a wood header shall be supported by approved framing anchors or on ledger strips not less than nominal 50 mm by 50 mm. 7.2.2.6 Lateral restraint at supports Joists shall be supported laterally at the ends by full-depth solid blocking not less than 50 mm nominal in thickness; or by attachment to a header, band or rim joist, or to an adjoining stud; or shall be otherwise provided with lateral support to prevent rotation. Joists exceeding a nominal 50 mm x 150 mm shall be supported laterally by solid blocking, diagonal struting (wood or metal), or a continuous 25 mm by 75 mm strip nailed across the bottom of joists perpendicular to joists at intervals not exceeding 2400 mm. 7.2.2.7 Drilling and notching Structural floor members shall not be cut, bored or notched in excess of the limitations specified Figure 7-9.
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