The past couple days we’ve talked about Continuous Foam Insulation on the outside of the house as a Thermal Barrier and then we took a look at Roxul Insulation inside the exterior walls.
Today let’s take a look at how and where to use Spray Foam. There are basically two major types of foam application:
- Spray Foam for large areas, workers spraying foam over large areas must wear a full Tyvek Suit and respirator while spraying foam, this type of application is popular for attic insulation
- Spray Foam using a Foam Gun that is used to seal cracks and crevices.
Take a look at today’s photograph and you will see one of the men on our Set Crew spraying foam from a can and using a Foam Gun. This application is used to fill voids and stop Cold Air Penetration.
Today’s discussion of Foam will be limited to this type of Foam Gun application.
When you are able to see a crack between the house and the foundation, spray foam from a Foam Gun is used to close off the cold air from penetrating the house.
And, today’s photograph for today you can see how the foam has filled the crack.
As the foam is sprayed into the crack, crevice, or hole it expands and completely seals off that void. No air can penetrate through any of these openings. Realistically, spray foam is the only effective way to seal off these penetrations in the building envelope. Since the surfaces of lumber are never perfect, they do have some imperfections, the only way we know to close off the voids is with spray foam.
Stopping Cold Air from Penetrating the building envelope is critical conserving heat. Up in the attic we use the same type of spray foam all of the various wires and pipes that extend up into the attic.
A foam gun and cans of expanding spray foam are valuable tools.
What are your thoughts about spray foam?