Attic Temperature Vs Outside Temperature

The technique applies to any number of component layers in an assembly.

Attic temperature vs outside temperature. What should be the difference between outside inside temperature of an attic on a summer day versus a winter day. A good sign is when you open your attic in the winter and you don t see any frost on the nails poking through. Attics can reach temperatures of 150 to 160 degrees f during a summer day although outside air temperatures are only 95 to 97 degrees f. Warner is right that the attic should be close to the outside temp.

However more often than not. I hit 130 degrees in my attic when the outside temperature was. If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals. Should there be a difference between a 78 degree day and a 98 degree day.

Table 1 shows the calculation for the example in figure 1. For an indoor temperature of 68 f and an outdoor temperature of 8 f the temperature at the interface between the batt and the foam will be 27 f effect of indoor and outdoor air films is omitted. Your insulating and heating cooling the house not the attic. Simply undertstand that the insulation in your inner envelope ceiling attic floor must insulate the inner envelope of your house living area against whatever temp is in your attic.

Ideally you don t want it any hotter than it is outside but reality generally prevent this from happening. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. What should the attic temperature be relative to the outside and house temperatures assuming a new supposedly well insulated house.