Rim joist spray foam insulation in Airdrie addresses the band where each floor structure lands on the wall below it. In a newer town it is easy to assume this is an old-house problem, and it is not: the band exists in every house with a wood floor structure, and in most Airdrie homes it is sealed by nothing at all.
A newer house still has the band
Modern construction put a friction-fit batt in that space and moved on. A batt slows heat and does nothing about air, so where the joist ends are open to the outside at the perimeter, air moves in around it continuously. The house meets code and the band still leaks, which is why cold floors along an outside wall are a common complaint in houses barely fifteen years old.
The band above a walkout
Airdrie has a great many walkout and side-split lots, and those produce an additional band partway up the building where the floor structure lands on a foundation wall that is above grade on one side and below it on the other. That junction is exposed on more of its surface than a standard rim joist and it sits directly under living space. On a walkout it is usually the single coldest line in the house.
Reach it while the basement is open
This is the practical point for this town. With so many Airdrie basements still undeveloped, the band is fully accessible right now and the work is quick, clean and cheap. Once a basement is developed the same band sits behind a finished wall, and reaching it means opening and closing that wall at a cost that usually exceeds the insulation itself. The difference between doing it now and doing it later is not the material.
What the occupant actually notices
Cold air entering at the band arrives directly beneath the floor of the level above, which is why the reported symptom is cold floors rather than a cold basement. Sealing it addresses the air leak and the insulation gap in one pass, and it is one of the few pieces of envelope work where the occupant notices the difference rather than merely believing in it.
Rim Joist Spray Foam Insulation Airdrie: Common Questions
Our house is only fifteen years old. Does this apply? Yes. The band exists in any house with a wood floor structure, and a friction-fit batt in it seals nothing.
We have a walkout. Is that different? It adds a second band partway up the building, exposed on more of its surface than a standard rim joist and sitting directly under living space. On an Airdrie walkout it is usually the coldest line in the house.
Should we do it before finishing the basement? Considerably cheaper. Once a wall is in front of it, reaching the band costs more than the insulation does.
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