Attic Bypass & Frost

What causes it

Warm, moist household air leaks into the cold attic through bypasses and condenses or frosts on the sheathing.

What we check

We check attic sheathing for frost and staining, insulation depth and air sealing at penetrations.

Why it matters

Attic frost means hidden air leakage that rots sheathing and feeds ice dams — a classic cold-climate finding.