Attic Temperature Differential

Warner is right that the attic should be close to the outside temp.

Attic temperature differential.

The frost is frozen condensation from the warm air meeting the cold air and not ventilating if that. The layer of continuous insulation in the 2 4 wall shields the highly conductive steel stud from exposure to near outdoor temperature. 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. Your insulating and heating cooling the house not the attic.

Attic temperature depends on the amount of solar radiation construction details and the rate of ventilation. Providing half air change per. Snow acts as an insulator. 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.

63 9 f as was the case for the ceiling cavity and eave space temperatures total r value does not tell the whole story. Attic temperature 0 f outdoors calculated difference. A good sign is when you open your attic in the winter and you don t see any frost on the nails poking through. Ideal attic temperatures and humidity settings aren t always easy to maintain.

Ideal attic temperature and humidity settings. 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. 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. Freezing and excessively hot outdoor temperatures rain and high.