TPO & PVC - Oversold as Energy Efficient.

...in my opinion.

These roofs attract dirt like crazy! The top photo is a TPO roof in Lubbock when new (on left) and after 4 years (on right). On bottom, a grocery store TPO roof after just 1 year.

I don't know how you guys sell that stuff!

I'm still surprised your Gaco roofs don't look like that. Mine's no longer super bright and it's surrounded mostly by concrete and grass.

TPO is also efficient because it's emmissive. They claim that being dirty doesn't effect it's efficiency but I'd be surprised if there wasn't a limit.

Dirt doesn't change emmissivity? Pretty sure they are wrong about that. Any time you change the color from lighter to darker it is warmer - whether that is technically emmisssivity is pointless because it affects the roof's ability to reflect heat.

I'm a Level One Infrared Thermagrapher and at least that's how I remember it.

Even our acrylic doesn't attract dirt nearly as much as TPO. That upper right hand pic is about a 2:12 pitch with zero ponding water. Acrylic and silicone stay pretty white except where ponding. At least ours do.

So I see you've went with silicone roofing tim ive been doing it for 2 or 3 years on specialty applications ive used gaco and km the gaco 50 yr is a joke I try to stay away from silicones now but I want to know what you think of gaco and why you like silicone over acrylics or emulsion?

a gaco roof I did 200' feet high lol the pics during clean up.

It's been a hard decision but Gaco brings us leads and good literature. The others didn't.

I thought that a few years back, whoever it is that gives the energy ratings, knocked down white roofing a few notches due to it getting dirty, fading, graying...whatever (graying? IDK)

According to the cool roof rating council (there really is one), reflectivity on single ply seems to consistently lose about 10% over their three year weathering test.

http://coolroofs.org/products/results

Whether they continue to decline at that rate every three years, they don't say.

Good stats - they are now on my website. :-)