Why is Blocked Soffit Intake Venting a Factor in Attic Condensation Problems?

Even if continuous soffit venting was installed (seen from outside) it may be blocked in the attic (shown here). The photograph shows building eaves blocked by mineral wool insulation. In this case the builder and insulator were fortunate because even though roof venting was blocked, there was not an attic moisture problem.

And we were pleased to note the absence of significant ice dam leak stains on the roof sheathing or rafters. Still, opening the soffits for venting can result in a cooler roof surface and longer shingle life, even if there are no moisture problems in the attic. More.

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