Attic Temperature Differential

Warner is right that the attic should be close to the outside temp. Calculations indicate that on a july day in texas a ventilation rate of one air change per minute for a typical attic using 95 degree f air will lower the peak attic temperature to about 101 degrees f. In an ideal world the attic temperature would be the same as the outside temperature.

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In reality however variables get in the way.

Attic temperature differential.

Attic temperature depends on the amount of solar radiation construction details and the rate of ventilation. Attic temperature 0 f outdoors calculated difference. Ideal attic temperature and humidity settings. The frost is frozen condensation from the warm air meeting the cold air and not ventilating if that.

A good sign is when you open your attic in the winter and you don t see any frost on the nails poking through. Your insulating and heating cooling the house not the attic. The white roof lowered the attic temperature by about 20 f. Installing attic vents if you don t already have them is another way to assist in the movement of hot and cold air out of your attic.

Ideal attic temperatures and humidity settings aren t always easy to maintain. These images came from a presentation danny parker gave pdf on fsec s cool roof research the third graph shows attic temperatures from the middle of the attic for several different types of roofing as well as a sealed attic. Providing half air change per. Dropping the temperature from 120 150 degrees to roughly the same as the outside temperature will save you enough on your power bill to offset the purchase and installation charge.

63 9 f as was the case for the ceiling cavity and eave space temperatures total r value does not tell the whole story. Snow acts as an insulator. Freezing and excessively hot outdoor temperatures rain and high. The layer of continuous insulation in the 2 4 wall shields the highly conductive steel stud from exposure to near outdoor temperature.