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What is the difference between vented & unvented attics?

April 26, 2017attics difference unvented vented

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What is the difference between vented & unvented attics?

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Unvented attics use air-impermeable insulation on the underside of the roof deck as a barrier to prevent condensation of moisture. Vented attics allow hot and/or moist air to escape to the exterior by air flow.