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 Insulation, Polystyrene, Boards and Pipe Covering", for Type 2, 3 or 4 polystyrene.
In Plain Language
Permanent form material, such as insulated concrete forms left in place, must meet the requirements set out in this article for use in foundation construction.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.