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Old 05-08-2018, 01:36 AM   #1
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Spray foam insulation question

From everything Iíve read, closed cell spray foam insulation is the best choice for R value, and Iím leaning heavily toward using it on my ceiling in my skoolie.
In the demonstration videos Iíve watched, itís touted because, when applied, it expands and fills ALL gaps within/between two surfaces. Cool.
But on skoolie photos Iíve seen that have been sprayed, the (finished) ceiling is NOT installed, and the foam is NOT smooth...so, when the ceiling IS installed after, the foam underneath would, because of the foamís uneven surface, have gaps/air pockets, right?

Doesnít that defeat the purpose of using the foam in the first place?
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Old 05-08-2018, 07:17 AM   #2
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There's a YouTuber guy in NV that sprayed floor, wall, and ceiling with foam. Check out his videos.

There may be gaps between your insulation and the ceiling. Overspray and trim if you're really worried about it. But as long as your aren't mounting your ceiling directly to the ribs, there won't be thermal bridging. And for the record "air gaps" ARE the insulation. Whether it be batting or open/closed cells, you are trapping tiny air pockets on purpose. Bigger pockets will give you less of an R value but it won't kill you. Those bigger pockets are inside and filled with heated/cooled air. The insulation will isolate those pockets from the outside temps.

Number 17 is the foam video but he does a good job thru-out.

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Old 05-08-2018, 07:27 AM   #3
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Old 05-08-2018, 07:32 AM   #4
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And video #20
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Old 05-08-2018, 07:39 AM   #5
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Ahh ... dzlfreak ...

Watch all of his videos
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Old 05-08-2018, 07:55 AM   #6
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Yep. Never met or spoke with the guy but he's ok in my book. He answers a lot of the comments which is always a plus (but rarely done) with people trying for a public presence. Doesn't hurt that he's down to earth, into guns, and not from Jersey.
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Old 05-08-2018, 08:52 AM   #7
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Thank you for sharing your knowledge and these videos! Answered my questions ✔️
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Old 05-08-2018, 09:12 AM   #8
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Thank you for sharing your knowledge and these videos! Answered my questions ✔️
Sweet, that's why we are here.

There's another thread I was in just this morning as well about "crushing rigid board" without framing. Qin't going to happen but I'm framing anyway since the spray foam won't be level especially if I do it myself.
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Old 05-08-2018, 10:02 AM   #9
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Doesn't hurt that he's down to earth, into guns, and not from Jersey.
Hey man, there's nothing inherently wrong with New Jersey or its residents. I'll concede that there are some remarkably bad humans from New Jersey but, like any other place, there are also lots of good people.
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Old 05-08-2018, 11:03 AM   #10
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Sweet, that's why we are here.

There's another thread I was in just this morning as well about "crushing rigid board" without framing. Qin't going to happen but I'm framing anyway since the spray foam won't be level especially if I do it myself.
Nuttin' wrong with framing.

My only intent is that folk can make their own decision based on all the info we can give them.
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