Ceilings

For ceilings it is best to use 12 & 15mm thickness boards according to the following recommended fixing centres (10mm boards can also be used, provided that the recommended fixing centres are adhered to):- Across Top of Beneath Rafters or Joists Exposed Rafters on Cathedral or Flat Ceilings Western Red Cedar 10mm thick 600mm 450mm 15mm thick 1200mm 900mm California Redwood 10mm thick 600mm 450mm Cypress Pine 12mm thick 900mm 600mm Tasmanian Oak 12mm thick 900mm 600mm 19mm thick 1200mm 900mm Oregon 15mm thick 1200mm 900mm