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Contents  

Recommended Standard Timber Sizes for Building Components 
2004/10/18

 
 
 
Shape Structural Uses Non-Structural Uses
  Normal
Size		 Minimum
Size		 Normal
Size		 Minimum Size
(after dressing)
Square 100mm x 100mm (4" x 4") 90mm x 90mm 25mm x 25mm (1" x 1") 22mm x 23mm
  125mm x 125mm (5" x 5") 115mm x 115mm 50mm x 50mm (2" x 2") 47mm x 48mm
  150mm x 150mm (6" x 6") 140mm x 140mm 75mm x 75mm (3" x 3") 72mm x 73mm
Rectangle 25mm x 50mm (1" x 2") 20mm x 45mm 15mm x 25mm (? x 1") 13mm x 22mm
  50mm x 100mm (2" x 4") 45mm x 90mm 15mm x 50mm (? x 2") 13mm x 47mm
  50mm x 125mm (2" x 5") 45mm x 115mm 15mm x 75mm (? x 3") 13mm x 72mm
  50mm x 150mm (2" x 6") 45mm x 140mm 25mm x 50mm (1" x 2") 23mm x 47mm
  75mm x 100mm (3" x 4") 70mm x 90mm 15mm x 100mm (? x 4") 13mm x 97mm
  75mm x 150mm (3" x 6") 70mm x 140mm 40mm x 50mm (1? x 2") 38mm x 47mm
      40mm x 75mm (1? x 3") 38mm x 72mm
      40mm x 100mm (1? x 4") 38mm x 97mm
      40mm x 125mm (1? x 5") 38mm x 122mm
      40mm x 150mm (1? x 6") 38mm x 147mm
      50mm x 75mm (2" x 3") 48mm x 72mm
      50mm x 100mm (2" x 4") 48mm x 97mm
      75mm x 100mm (3" x 4") 73mm x 97mm
      75mm x 125mm (3" x 5") 73mm x 122mm

 
Boarding
Sizes recommended are:		 Floor Boards
Sizes recommended are:
Normal Size Minimum Size
(after dressing)		 Normal Size Minimum Size
(after dressing)
20mm x 100mm (? x 4") 18mm x 97mm Thickness  
20mm x 125mm (? x 5") 18mm x 122mm 20mm (?) 18mm
20mm x 150mm (? x 6") 18mm x 147mm 25mm (1") 23mm
30mm x 175mm (1? x 7") 28mm x 172mm 30mm (1?) 28mm
30mm x 200mm (1? x 8") 28mm x 197mm Width  
30mm x 225mm (1? x 9") 28mm x 222mm 100mm (4") 97mm
30mm x 250mm (1? x 10") 28mm x 247mm 125mm (5") 122mm
    150mm (6") 147mm
Stair Treads
Sizes recommended are:		      
Normal Size Minimum Size
(after dressing)		    
40mm x 250mm (1? x 10") 38mm x 247mm    
50mm x 250mm (2" x 10") 48mm x 247mm    
50mm x 300mm (2" x 12") 48mm x 297mm    
75mm x 250mm (3" x 10") 73mm x 247mm    
75mm x 300mm (3" x 12") 73mm x 297mm    


Note: Above information is extracted from MTIB's publication entitled "Specifying Timber for Building Construction"
Source:  
 
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