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Attic Bypass Condensation — Attic defect
Defect · Attic

Attic Bypass Condensation

Attic Bypass Condensation is a attic defect common in Twin Cities metro homes. A hidden cause of roof-deck rot and 'mystery' attic mold in cold climates.

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Attic Bypass Condensation is a attic defect common in Twin Cities metro homes. A hidden cause of roof-deck rot and 'mystery' attic mold in cold climates.

Field Evidence

What we find.

Attic Bypass Condensation as found on a Twin Cities metro inspection

As found — Attic Bypass Condensation as found on a Twin Cities metro inspectionDocumented — Attic Bypass Condensation as found on a Twin Cities metro inspectionAs foundDocumented◂▸

What causes attic bypass condensation?

Warm moist house air leaks into a cold attic and condenses on the underside of the roof deck.

What we check

Bypass sealing at top plates, can lights and chases; ventilation balance; deck staining and frost.

Why it matters

A hidden cause of roof-deck rot and 'mystery' attic mold in cold climates.

Related: Attic Inspection · All defects · Knowledge center

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