Most cost-effective method for achieving 3 ACH 50?
What are your strategies?
Here’s our scenario: climate zone 5, trying to get away using fiberglass batts. One colleague is recommending the air-tight drywall approach. Approaches would be either use a spray on gasket material like Owens Corning EnergyComplete or manually caulking of drywall (which will significantly slow down the drywallers). Both of these seem like they will be a lot more expensive than a traditional exterior housewrap (i.e. Zip-wall, BlueSkin or just Tyvek) but he thinks it will be tougher to achieve 3 ACH 50 with that scenario and there will be moisture risks if we do get there. I understand the moisture risks if we have exterior rigid insulation, but the exterior housewraps mentioned above should allow the wall assembly to dry to the outside, correct?
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