Unsafe Attic Temperatures

Most attics aren t made to walk in and insulation duct work and low clearances just increase the difficulty.

Unsafe attic temperatures. Excessive heat deteriorates items you store in the attic and can cause moisture problems in your house. They have thermostats that turn the fan. What should the attic temperature be relative to the outside and house temperatures assuming a new supposedly well insulated house. In some cases attic temperatures can reach above the 150 degree mark.

They have done much of their testing in las vegas and phoenix where conditions are the worst and 150 degree attic temperatures are common. If this isn t bad enough add to it the fact that an attic can reach temperatures of 120 degrees on a hot summer day. Field monitoring of numerous attics has confirmed that the temperature of the roof sheathing of a unvented roof will rise by a few to no more than 10 f more than a well ventilated attic. 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.

See webb site address above for full text. Alternatively install passive vents such as gable soffit and ridge vents which. High temperatures inside your attic shorten the life span of shingles. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures.

To head off these problems consider these options for bringing your attic s temperature down. If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals. If your attic is not properly ventilated your cooling costs will not be as low as they should be because your system is constantly running to compensate for the excess heat. It s also been found that roofing design and materials have more effect on attic temperature than ventilation.

The white roof lowered the attic temperature by about 20 f.