Buiding a conditioned attic in a hot & humid climate the right way!
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Uploader Comments (MattRisinger)
All Comments (48)
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Foam looks like it was sprayed "COLD", Dripping all over the ducts also looks terrible, and the duct work looks like it had a few Kinks restricting the airflow. The depth of the foam looks correct.....
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@MattRisinger There have been a few applications when I was hanging fiberglass insulation and in some of them we had to use card board batting for an airspace,I have watched quiet a few foam spraying videos learning about this and thought if they had an inch of space stapling up cardboard between the rafters and then spraying the foam it would seem the singled roof would then get its airflow that way without overheating the shingles and still have the insulation?
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@aaronoftexass This was not a pretty install. This particular crew was fairly new at spraying foam. I highly recommend using a coat hanger to do a depth poke test. Just wrap a piece of tape around the 5.5" mark on a coat hanger and you can ensure that it's meeting that min depth. That's one of the beauties of using foam in that a rookie crew can still do very well performing install even if it's not pretty. Using traditional insulation requires expert crews and even then it's not as good.
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@Artoconnell Are you saying you would do a worse job of serviceing a hard to get to a/c to the point it would only last half as long? And they are designed for that "extreme" envionment arent they? I just saw an a/c from 1960 still working in an attic...................please tell us a/c pro how this stuff makes a/c's last longer and why, but come up with something better than saying a/c guys do crap work until they get into an attic that the homeowner cools all year. extra btu load=more a/c run
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Im my opinion, adding a radiant barrier like a foil - with a small air gap between the foil and the roof deck - and THEN spraying the foam would be much more efficient. The foam has better air sealing abilities...but it isn't much different than laying batt insulation.
amusingisthedawn 5 months ago
@amusingisthedawn Good point about the radiant barrier. This house has a very reflective Galvalume metal roof so the radiant barrier is on the top side of the roof. Also, you could not effectively insulate this particular attic at the roof line with batt insulation. The foam forms a total seal and insulation barrier over ALL the framing which batts couldn't accomplish. Thanks for commenting. Matt Risinger
MattRisinger 5 months ago
I have a question about this myself,I live in North west Florida and when I was younger and doing roofing I was inside a roof and had asked why dont they put insulation up here as well? The answer I got back was the shingles get hot enough on top of the roof and if the insulation was under them they would bake off of the roof so i never thought anymore about it.in this video are you under a metal roof or a shingled one?I can see metal holding up with the foam but not sure about shingles.
tappakeggaday1 6 months ago
@tappakeggaday1 GREAT QUESTION> Conventional wisdom has been that shingles need to be vented underneith or they will cook. In this house we used a metal roof so that issue doesn't translate to metal. However, the latest building science talk is that shingle temp only rises by 2-3 degrees without venting underneith. Building Science expert Joe Lstiburek talked about that issue in the latest issue of Fine Homebuilding. I wouldn't hesitate to foam under a shingle roof and have done it before.
MattRisinger 6 months ago
Would LOVE to work in that attic...the equipment life is basically doubled from being more serviceable, and also not being in such an extremely hot environment. NIce JOB
Artoconnell 9 months ago
@Artoconnell I can tell you from experience that a conditioned attic with temps in the low 80's on a 100 degree Austin TX day are much more manageable to be in compared to a typical Austin attic that's 130 degrees when it's 100 outside. Think about how much more efficiently this equipment will run when the environment around it is 50 degrees cooler than a neighbor's house. Seems to me that anyone working in a hot attic would be tempted to hurry with their job at hand. -Matt Risinger
MattRisinger 6 months ago