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Venting a Tricky Old Roof

Retrofitting undershingle intake and ridge vents helped to cool and dry this 120-year-old attic

While old houses can have enormous appeal, they also can have big problems, including air-circulation issues. In the course of various renovations to an old house in Rhode Island, FHB editorial adviser Mike Guertin upgraded the ventilation to bring the attic into the house's building envelope. Because Guertin couldn't install air-intake vents at the eaves, he had to use rooftop air-intake vents. He then installed ridge vents to balance the system and allow it to circulate properly. This article includes information about the way to calculate the proper amount of venting for any roof.

Venting a Tricky Old Roof
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