Mark writes from Mount Albert, Ontario: “What is the difference between Celfort® 300 Extruded Polystyrene Rigid Insulation and Celfort® 200 Extruded Polystyrene Rigid Insulation?
PS: I used the ATTICAT last week and it worked great -Two friends are going to use it now.” Answer: Thanks for your comments about the AttiCat® blown-in insulating system. We are pleased to know you had a good experience with it. The main difference between Celfort® 300 and Celfort® 200 is their resistance to compression. The number 300 stands for 30 psi (pounds-per-square-inch) and 200 stands for 20 psi. The greater the number, the stronger the board is to resist compression from live and static loads. That said, it also helps figuring out what is best for the application. The 20 psi product is typically used in the exterior and interior of a home – walls and floors. The 30 psi product is typically used under the slab of a residential garage or the exterior perimeter of a commercial building.
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