HOW HOT IS YOUR ROOF?
Material |
Roof Temperature rise above air temperature (degrees F, full sun, no wind) |
Remarks
|
|---|---|---|
| Bright white smooth materials | 15 F |
The coolest construction materials, can be roof coatings, membrane, metal, tile, ect. A soiled white is warmer about 30 F. |
| Rough white surface | 35 F |
Rough surfaces of any given materials absorb more sublight than smooth surfaces. |
| Very light (pastel) colors | 15 to 55 F |
|
| Intense but not very light colors (green, red, blue, ect. | 79 to 83 F |
Research may identify cooler colors. |
| Medium gray | 52 F |
Reflectance halfway between white and black. |
| Aluminum-pigmented asphalt roof coatings | 50 to 65 F |
The brightest aluminum coatings are the coolest. |
| Built-Up Roof (BUR) covered with gravel | 61 to 83 F |
Cooler values obtained with lighter gravel. |
| Asphalt shingles and granulated capsheet | 72 to 90 F |
The lighter asphalt shingles are cooler, but not much. In particular, even "white" asphalt shingles are hot. |
| Black materials | 90 F |