Attic Temperature Differential

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.

Attic temperature differential.

The white roof lowered the attic temperature by about 20 f. Ideal attic temperature and humidity settings. In an ideal world the attic temperature would be the same as the outside temperature. Attic temperature 0 f outdoors calculated difference.

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. Snow acts as an insulator. Ideal attic temperatures and humidity settings aren t always easy to maintain.

Warner is right that the attic should be close to the outside temp. 63 9 f as was the case for the ceiling cavity and eave space temperatures total r value does not tell the whole story. In reality however variables get in the way. 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. 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. Freezing and excessively hot outdoor temperatures rain and high. Attic temperature depends on the amount of solar radiation construction details and the rate of ventilation.