For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3.

Timber roof batten span tables. Decking shall comply with as 4785 timber softwood sawn milled products. Member tables for seasoned timber stress grade f17. Continuous span beams are beams supported at three or more points along their length. 3 where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion.

Single span beams are beams supported at two points only. Sheet roofing tiled roofing roof load width rlw mm 1500 2100 4500 7500 1500 2100 4500 7500. All tables have been reproduced from as1684 2006 residential timber framed construction standard and assumes that a roof sheet mass of 10 kg m2 is added. 1 refer to general notes for information that is relevant for all span tables.

Maximum overhang of batten is 250 mm. Wind classification n1 n2. Seasoned hardwood f17129. Tq recommends a maximum mc of 15 for residential decking.

Table 1 timber posts supporting pergola or carport roof max. Decking boards shall be seasoned to the requirements of the applicable australian standard i e. Continuous span beams are beams supported at three or more points along their length. Single span beams are beams supported at two points only.

Hardwood 10 to 18 softwood 10 to 15. Span tables f7 rafters 30mm 11 f7 rafters 42mm 14 verandah beams f7 42mm sheet roof 17 verandah beams f7 42mm tile roof 20 verandah beams gl8 sheet roof 21 verandah beams gl8 tile roof 24 ridge beams f7 42mm sheet roof 25 ridge beams f7 42mm tile roof 28 internal floor joists f7 42mm 30. Ns not suitable general notes 1. Timber queensland limited technical data sheet 19 pergolas and carports revised march 2014 page 2 timber posts table 1 lists the sizes for timber posts.

Stramit roof batten 0 48 0 48 mm g550 0 60 kg m stramit roof batten 0 55 0 55 mm g550 0 77 kg m stramit cyclonic roof batten 0 75 mm g550 0 98 kg m stramit ceiling batten 0 42 mm g550 0 37 kg m stramit wa ceiling batten 0 42 mm g550 0 34 kg m. Pergola rafter spans for 600 mm and 900 mm spacing. 10 kg m 2 roof area supported m2 5 10 20 member size mm maximum post height mm unseasoned cypress f5 75 x 75 100 x 100 3400 4800 2400. Refer to as1684 tables for other overhang spans.

For the purpose of using these tables span may be interpreted as the clear distance between supports measured along the beam. Table 1a bearers supporting single storey loadbearing walls maximum floor load width 1800mm. 2 for design parameters refer to figure 7 26. Maximum wind speed n2 refer to as4055 for site wind classification.

Other more complex load condition spans can be determined with our free hyne timber design 7 5 software.

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