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The result will be different depending on the way the roof is framed. With an open attic, it will simply act to reduce to overall amount of airflow that results from the chimney effect, thus increasing the heat trapped in the attic, affecting the longevity of the roofing material and increasing air conditioning bills. In certain cathedral type roof framings, individual spaces between rafters could be cut off from any ventilation at all, causing severe buildup of heat.

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13y ago
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Q: What if ridge vent is not fully across entire roof?
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