By Mark LaLiberte
High-performance builders have long understood the importance of good air sealing, but the topic is now attracting interest from conventional builders as well. With codes mandating confirmed air leakage numbers of 3 ACH 50 or better, those builders are realizing that they need help.
Along with my business partners, Justin Wilson and Gord Cooke, I teach air sealing as part of the Applied Building Science classes at Construction Instruction. Again and again, we've seen builders of all types challenged by this important step.
But the truth is that effective air sealing isn't mysterious, even if some builders seem intent on over-complicating it. Some complain that the amount of information on the topic is overwhelming and contradictory. Others point out that they can't know for sure before starting a house where the air leaks will be. While both of these objections may be true, they're really just signs that the builder lacks a defined air sealing... read more