Hello from Texas - Page 2

jeff5may · 09-14-16, 02:38 PM

U CAN DOIT!!

That elastic polymer paint will stick to anything. I have a feeling it ain't much different than the flex seal stuff on t.v. now. Whether or not YOU should use it is a different story. It does prolong the life of regular, aging asphalt shingles, by keeping the grit glued to the shingle. Whether or not to use it depends on lots of things. I guess stupid is as stupid does. My wife says I do some pretty stupid things.

Solar panels make a pretty good floating heat absorber too. Radiant reflective paint, not so much.

KazBach · 09-14-16, 02:44 PM

Quote:

Originally Posted by jeff5may

U CAN DOIT!!

LOL, maybe I can and should.

Quote:

Originally Posted by jeff5may

U CAN DOIT!!
It does prolong the life of regular, aging asphalt shingles, by keeping the grit glued to the shingle.

That's the thing 1) The shingles are less than 2 years old. 2) They are white.

Still the attic gets hot hot HOT.

May do a ridge vent first.

jeff5may · 09-14-16, 04:41 PM

If your rafters aren't insulated and are relatively open, the aluminized bubble wrap products do a pretty good job of keeping the heat outdoors where it belongs. With a pitch roof, you must provide an air path in the gap between the shingle roof and the reflective layer. Otherwise, the heated air will just soak through the bubble wrap. With a flat roof, you pretty much have to have a refractive (insulation) layer, as there is no convective (smokestack) effect to speak of.

With a 50 degree gradient, it won't take much air path at all to notice a difference. In one house I rented, I put up some of the cheapest stuff just to see how it would work: thin, white styrofoam with the mylar glued to one side stapled to the bottom of the rafters. Maybe 1/4 or 3/8 inch thick. 4 inch gap on top between the rafters and the ridge cap. The roof was 3 tab shingles, slate or charcoal color, over the pretty much uninsulated (somewhat) finished (bedroom-ish) attic. I stuck a solar (pv) vent fan in the downwind gable hole and used a 50 ft roll of the silver bubble wrap to fashion a ridge duct leading to the solar fan. The whole project paid for itself in one summer in Kentucky. I imagine it would work even better in Texas. Nobody could see it except my electric bill...

09-14-16, 02:38 PM	#11
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	U CAN DOIT!! That elastic polymer paint will stick to anything. I have a feeling it ain't much different than the flex seal stuff on t.v. now. Whether or not YOU should use it is a different story. It does prolong the life of regular, aging asphalt shingles, by keeping the grit glued to the shingle. Whether or not to use it depends on lots of things. I guess stupid is as stupid does. My wife says I do some pretty stupid things. Solar panels make a pretty good floating heat absorber too. Radiant reflective paint, not so much. Last edited by jeff5may; 09-14-16 at 03:09 PM..

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09-14-16, 04:41 PM	#13
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	If your rafters aren't insulated and are relatively open, the aluminized bubble wrap products do a pretty good job of keeping the heat outdoors where it belongs. With a pitch roof, you must provide an air path in the gap between the shingle roof and the reflective layer. Otherwise, the heated air will just soak through the bubble wrap. With a flat roof, you pretty much have to have a refractive (insulation) layer, as there is no convective (smokestack) effect to speak of. With a 50 degree gradient, it won't take much air path at all to notice a difference. In one house I rented, I put up some of the cheapest stuff just to see how it would work: thin, white styrofoam with the mylar glued to one side stapled to the bottom of the rafters. Maybe 1/4 or 3/8 inch thick. 4 inch gap on top between the rafters and the ridge cap. The roof was 3 tab shingles, slate or charcoal color, over the pretty much uninsulated (somewhat) finished (bedroom-ish) attic. I stuck a solar (pv) vent fan in the downwind gable hole and used a 50 ft roll of the silver bubble wrap to fashion a ridge duct leading to the solar fan. The whole project paid for itself in one summer in Kentucky. I imagine it would work even better in Texas. Nobody could see it except my electric bill...