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the U.S. specify ventilation rates as a minimum of 1 sqft of opening per 150 sqft (1:150) with a ratio of 1:300 in some conditions. Warm air rises, so ceiling insulation is designed to have a higher r-value and the insulation is often installed between the ceiling joists or rafters. A properly insulated and ventilated roof is called a cold roof. A warm roof is a roof that is not ventilated, where the insulation is placed in line with the roof pitch. A hot roof is a roof designed not to have any

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