The Ontario Building Code | Permanent Form Material

9.15.4.1. Permanent Form Material

(1) insulating concrete form units shall be manufactured of polystyrene conforming to the performance requirements of CAN/ulc-S701, "Thermal insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation, Polystyrene, Boards and pipe Covering", for Type 2, 3 or 4 polystyrene.