Creating an Airtight Shaft Liner Area Separation Wall
The IECC requires that town homes and duplexes achieve 3 or 5 ACH50 depending on the climate zone the dwelling is built in. My experience is that attached housing is 2-3 time leakier than detached even though detached is generally twice as large. In the past creating airtight attached dwellings has been quite difficult and costly do to the 1” to ¾” gap between the area separation and structural components of the assembly. Two recently completed UL and ICC/NAT tests are changing how we should think about construction and air sealing this assembly. This BUILDCast, explores what fire separation means and how air leakage can now be addressed.
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