Arizona Attic Temperature

The air inside your attic can reach temperatures upwards of 180 degrees far hotter than it actually gets outdoors.

Arizona attic temperature.

Ventilating an attic in arizona is no joke. If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals. The maximum sheathing temperatures recorded were 168 f 76 c for black shingled roofs and 147 f 64 c for white shingled roofs. This crazy heat can make you uncomfortable increase energy bills and damage your roof all while possibly voiding your roof s warranty.

Summer attic air temperatures with reflective roof peak at or slightly above outdoor air ambient. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. Without proper ventilation your attic can reach 160 f or more during summer. Summer attic air temperatures with old terra cotta colored asphalt shingles peaked at 140 to 145 at 18 above the blown in fiberglass insulation layer at the attic floor.

That s 130 degree temperature change harb said. But newer homes in central and southern arizona are insulated to ratings of r 30 to r 38 while newer homes in northern arizona generally have attic insulation at r 60 because of colder winters. During the summer it is like having an oven on top of your home that continues to work against your air conditioning s efforts to cool your home. Overall the plywood sheathing in black shingled roof systems tended to be 10 f to 15 f 5 c to 8 c warmer dur ing the midafternoon of a sunny day than the plywood in comparable white shingled roof systems.