Ridge vent in an unvented roof
About three years ago we switched from a traditional vented roof with soffit and ridge vents to an unvented roof design. We had open cell spray foam blown into the entire roof right underneath the roof sheathing. All the vents were closed up. Attics and crawl spaces become part of the conditioned living space.
now it’s time to replace the shingles and the roofer tells me I need a ridge vent. Is he mistaken? What good would a ridge vent do if spray foam is air impermeable? He claims to have 30 years of experience but unvented roofs are pretty much unheard of down here in south east Texas (hot humid climate) so I am doubting him.
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