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Timber framing code 2008: Floor Framing. - PowerPoint PPT Presentation


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Timber framing code 2008: Floor Framing. Specification:. Timber framed construction Conventional timber framed roof Roof pitch 22.50 Roof covering steel roof decking, 10kg/m2 Eaves width 600mm Brick piers supporting bearers Bearers 150 x 75 Unseasoned Hardwood, F11

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specification
Specification:
  • Timber framed construction
  • Conventional timber framed roof
  • Roof pitch 22.50
  • Roof covering steel roof decking, 10kg/m2
  • Eaves width 600mm
  • Brick piers supporting bearers
  • Bearers 150 x 75 Unseasoned Hardwood, F11
  • Joists 100 x 50 Unseasoned Hardwood, F11
  • Fitted timber floors Utility grade 19mm T&G

Radiata Pine

  • Wet area flooring 19mm CSR structafloor particleboard
remember the following information
Remember the following information:
  • Type of flooring determines the MAX SPACING of floor joists
  • SPAN of joists determines the SPACING of bearers
  • SPAN of bearers determines SPACING of piers
bearers clause 4 3 1
Bearers, Clause 4.3.1
  • The max span of 1600 for the floor joists will determine the max spacing of the bearers parallel to the building length.
  • Determine from the various tables the span for the given bearer size (150x75).
  • These spans determine the pier spacings
bearers supporting load bearing walls
Bearers supporting load–bearing walls
  • RLW = Rafter span + overhang
  • Rafter run
  • = 7.470 / 2
  • Rafter run= 3.735
  • Rafter length = 3.735 / Cos 22.5o
  • Rafter length = 4.042
  • Overhang =600 / Cos 22.5o
  • Overhang =0.649
  • RLW = 4.042+0.649 = 2.670

2

  • RLW = 2.7
flw bearers load bearing walls
FLW Bearers: load bearing walls
  • Table one of Supplement 13
  • Say RLW of 4500 (2700 actual)
  • FLW = 1600/2 = 800 (based on max joist span)
  • Read max bearer span from table 1 for FLW 1200
  • Allowable span for 150 x 75 = 1700
bearers floor loads only
Bearers: floor loads only
  • Table 5, supplement 13
  • FLW = ? (Based on max joist span)
  • FLW = 1600
  • Go to Table 5 for FLW 1800
  • Allowable span of bearer: 150x75 = 2100
centreline spacing of brick piers
Centreline spacing of brick piers
  • Supporting load bearing walls

This is determined by the span of the bearer supporting load bearing walls

  • = span of bearer plus 230 (size of brick pier)
  • = 1700 + 230
  • = 1930
centreline spacing of brick piers1
Centreline spacing of brick piers
  • Supporting floor loads only This is determined by the span of the bearer supporting floor loads only.
  • Span of bearer plus 230 (size of brick pier)
  • = 2330