Spray Foam Performance Across Canada's Climate Zones
Spray Foam Performance Across Canada's Climate Zones
Why The Same Material Performs Differently Depending On Where It Goes In
Spray foam's vapour-control and R-value performance both depend on ambient humidity, temperature swing, and how much moisture is moving through a wall or roof assembly, and those variables shift meaningfully across the country. Saint John's coastal Atlantic climate, with its salt air and persistent humidity off the Bay of Fundy, means a crew here regularly deals with a different vapour profile than an inland town sees.
What The Bay Of Fundy Climate Adds To The Picture
Coastal humidity and salt-laden air add their own demands beyond a typical inland house, and that changes how much closed cell foam and how much vapour control a project actually needs before it performs the way it is supposed to.
How Other Regions Approach The Same Question
It's worth seeing how differently spray foam gets specified elsewhere. A drier inland climate has more flexibility on open cell versus closed cell since vapour pressure is lower to begin with. A Great Lakes climate deals with a different kind of humidity load coming from a different direction entirely. Neither approach is wrong, they are solving for different local variables.
What This Means For A Saint John Property Owner
None of this changes the basic logic of getting closed cell wherever moisture is on the other side, but it does mean a quote that does not account for the Bay of Fundy's coastal humidity and salt air is skipping a step that actually matters here.
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