Attic Temperature Vs Room Temperature

For most homes the biggest concern is the effect of attic temperature on living space comfort.

Attic temperature vs room temperature.

Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. In addition structures were better insulated in an attempt to make them more thermally efficient. Basements attics and crawl spaces attic temp vs outside temp what is acceptable for attic temp vs outside temp. Each change had the potential for affecting the in service temperatures to which wood roof systems were exposed.

Heyer 1963 reported temperature histories for wall and roof. Attic temperature 0 f outdoors calculated difference. It was 92 93 yesterday and sunny and my attic was 135 by late afternoon. Summer attic air temperatures with reflective roof peak at or slightly above outdoor air ambient.

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. The layer of continuous insulation in the 2 4 wall shields the highly conductive steel stud from exposure to near outdoor temperature. In other words with proper ventilation gravity an attic in the summer with an outside temp of say 95 the attic should be. If your attic soars above 100 degrees and reaches the 150 mark its time to consult.

Now if the ridge vent is only partial or if the attic air temperature is excessive 20 degrees higher than the outside air fans may prove beneficial pick the right fan. The consensus seems to be that if you have the maximum amount of insulation in your attic floor for your area lowering the temperature of the attic by 10 or even 20 degrees will have a minimal if any impact of actual heating and cooling costs. Built in passive attic ventilation or active mechanical attic ventilation. In the cold winter months the attic s ideal temp should be about par with the ouside temp while in the hot summer months the ideal temp inside the attic should only gain perhaps 15 20 degrees above 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.