Sheet Materials

Class 1: Dry conditions - purely for interior, dry uses.

Class 2: Humid conditions - protected external applications and damp internal uses (and must have limited exposure to moisture during construction).

Class 3: Exterior conditions - exposure to weather over sustained periods or continuous exposure to relatively high humidity.

Please note: MR and WBP plywood are old terms for plywood standards that are no longer used. It is vital to specify and purchase plywood that is suited to job you are using it for, based on these classes. For example: 

If you have previously specified or purchased WBP (weather and boil-proof) or Exterior quality plywood for construction purposes, you should now purchase plywood to comply with EN314/2, Class 3. 

If you’re looking to purchase moisture resistant plywood, please purchase a Class 2 plywood.