Vapor Retarder in Walls with Heat Pump Cooling
I’ve asked about this before, but never clarified that we are using a heat pump with cooling in the summer months.
I’m in coastal PNW, climate zone 4. Standard here is a poly vapour barrier, but i am getting the sense that this may be a hold over from a time before cooling was common?
It seems like the building science is saying that an interior poly vapour barrier cannot be used when cooling will occur? The concept being condensation will occur on the face of the poly, behind drywall, during periods of interior cooling.
We will have a HRV, will this negate this risk or unrelated?
I’m a rookie owner builder and designer who is just trying to satisfy the powers that be.
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