Finding the Hidden Thermal Bypass: 5 Ways to Stop Winter Drafts and Slash Heating Bills

Diagram showing how to find and fix a hidden thermal bypass in a residential house framing cross-section.

A hidden thermal bypass is an unsealed gap in a home’s structural envelopeโ€”most commonly found at the rim joist, attic hatch, or plumbing penetrationsโ€”that allows conditioned air to escape. Finding and sealing a hidden thermal bypass requires isolating negative pressure zones within the house to stop thermal bleed and stabilize indoor temperatures. ย  The Invisible … Read more

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