Building Envelope
Insulation requirements by tier and assembly type; windows and doors (U-factor, ER); air barrier requirements; thermal bridging; common envelope strategies for Zone 7A.
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Latest articles
Airtightness in Zone 7A: how to build a tight house
In Zone 7A's extreme cold, air leakage isn't just an energy problem; it's a moisture and durability problem.
Building envelope requirements for Zone 7A
The building envelope — the walls, roof, foundation, windows, and doors that separate conditioned living space from the outside — is where a home's comfort, durability, and operating cost get built in.