Wafer and orient strand board (OSB)

• Similar to chipboard but using larger flakes of wood , less adhesive required , improved strength and stiffness . 
• Strength performance between plywood and chipboards 

• Glued Laminated timber (Glulam ) 

• Large structural members produced by joining small strips of wood together with glue to size , shape and quality . 

Plywood

• Obtained by cutting rotary veneers from timber logs and bonded together , alternate layers being crossed . 
• Glued wood panels comprising outer and inner sheets . 
• Odd number of plies is usually used , so that symmetrical distribution of piles about the centre sheet
• High strength in both directions . 
• If moisture content changes , equal and opposite bending effect occur , due to differential movement of symmetrically opposed sheets . 
• Can be used in situation with variable moisture content with minimum distortion . 
• For cladding , form facing for concrete . 
• Expensive 
• Commonly use as formwork , cladding and decoration purposes .