Wind Classification N1 & N2. SPAN TABLES Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. TECHNICAL DIAGRAM ON PAGE 35 – 30mm M AXIMUM ALLOW ABLE SP ANS (mm) Sheet Roof Spacing (mm) Rafter Size 600 760 900 1000 1200 66 x 30 850 750 700 700 600 90 x 30 1200 1050 1000 900 850 138 x 30 1700 1550 … Notes: 1) Refer to general notes for information that is relevant for all span tables. Construction details should be in accordance with AS1684.2: Residential Timber-Framed Construction. Span Tables F7 Rafters A maximum roof pitch of 25 degrees is assumed. Joist and Rafter Span Tables. See the notes below the span tables for details. I can find any tables to check myself. The maximum height of single storey construction allowed for in the Boxspan span tables shall be in accordance with AS/NZS 1170.2:2011 requirements. 3) Where rafters are equal to or exceed four times their breath, blocking should be used to reduce distortion. These span tables are calculated based on MOE and Fb values. These span tables do not take into account the design, certification or structural adequacy of any: • Existing foundation • New foundation • … AS1684.2 and 3. They also tell you what the maximum spacing should be between each section or timber member SIZE OF JOISTS (mm) CLEAR SPAN C16 JOIST (M) CLEAR SPAN C24 JOIST (M) 47 X 95 47 X 120 47 X 145 47 X 170 47 X 195 47 X 220 1.77 2.40 2.89 3.38 3.87 4.36 2.05 2.67 … This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. 7. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths. Floor Joist Span . Note: Our floor joist span tables are based on loadings given in the newer, amended version of BS 6399-1. Pergola Rafter Spans for 600 mm and 900 mm Spacing. An engineer told me 4x14 that are 32" oc. It has a log girder across the middle giving 20' spans. It has 2x6 T&G decking on top. SPAN TABLES - These span tables have been developed in good faith, with the assistance of Mr.Peter Falvey B.E., M.I.E.Aust., C.P.Eng., R.P.E.Q. It is for a large log home that is 40 x 40. Where can I find joist span tables for heavy cut timber joists. Ceiling Joist Span. 8. - These span tables are only for use in conjunction with TaranakipineTM timber products. Like 4x14 joists. 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