White Seal Roof Coating to Lower Attic Temperatures

[Patrick]

I decided to try some white roof coating to lower my attic temps and therefore hopefully lower my AC power consumption. My shingles are a very dark (not black, but close) asphalt type. I bought White Seal from Home Depot as the coating material. It's Energy Star rated and warranteed for 10 years. I bought it in the 5-gallon containers @ $64 each as that was much cheaper than by the gallon.

I didn't take attic temps before I started, but later I found my infrared thermometer and took some temps on the roof and at the attic vent.

The temp on the roof itself at 12:00 with full sun yesterday was 104F on the coating and 155F on the bare shingles.

Ambient was 88F and the attic outlet temp was 90F. My latitude is 36 degrees N.

The air conditioner seems to run less than before. Next year I'll be able to report on the difference in kWh used.