prohandyman wrote:Holding up fine. Of course I don't store it in the weather. Gets dirty easy, but easy to clean. It wasn't too awful hard to put on. Uses a special adhesive, and it is contact cement to the max. Make sure you have it where you want it prior to touching together. Would use it again. Len also uses it alot.
Charles Ipes wrote:Where did you find the black?
mikeschn wrote:Black ?![]()
This might be a good time to talk about colors...
As it turns out though, a coating on aluminum, whether it is anodized, or a clear coat sprayed on, can increase the emissivity of the aluminum tremendously. Clear anodized aluminum has an emissivity of 0.76-0.84 (depending on the thickness of anodization). A clear coat would be similar, depending on thickness. Of course, white painted aluminum could have even higher emissivity (and would have a higher reflectivity). Bare mill-finish or polished aluminum, though, is going to get really hot in the direct sun.
So what kind of difference does it make in reality? The Lawrence Berkeley National Laboratory did a study on roof materials (http://eetd.lbl.gov/CoolRoofs/) and found the following average temperature gains above ambient temperatures in full sun and no wind (a 40°F gain on a 100°F degree day would equal 140°F surface temperature):
Bright white smooth materials: 15°F
Rough white surface: 35°F
Very light (pastel) colors: 15 to 55°F
Bare aluminum: 48°F
Medium gray (reflectance half way between white and black): 52°F
New, bare galvanized steel: 55°F
Intense but not very light colors (green, red, blue, etc.): 79 to 83°F
Black materials: 90°F
So on a day with an air temperature of 90°F, you could expect a clean white trailer roof (Filon, painted aluminum, painted wood, etc.) in the direct sun to reach a surface temperature of 105°F. A non-coated, non-anodized aluminum roof would reach a surface temperature of 138°F, and a black roof would reach a surface temperature of 180°F!
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