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Old 05-14-2018, 07:47 PM   #171
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Keep Ceiling Insulation?

Ok, need some help from some old-timers. I'm pulling down the "pegboard" ceiling, revealing the original foam insulation. It's packed pretty nice 'n neat....



Question - keep or ditch the foam insulation?


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Old 05-14-2018, 07:56 PM   #172
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Originally Posted by MarkyDee View Post
Ok, need some help from some old-timers. I'm pulling down the "pegboard" ceiling, revealing the original foam insulation. It's packed pretty nice 'n neat....



Question - keep or ditch the foam insulation?


Context picture:

Various closeups:


Since it's not the cheap batt insulation normally found, and it's in good shape I would leave it alone.
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Old 05-14-2018, 08:10 PM   #173
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Since it's not the cheap batt insulation normally found, and it's in good shape I would leave it alone.

That's the way my wife and I are leaning, but there is a definite smell to it. Its not a bad smell, mind you, but it is a tad annoying.


What about sealing everything up with some 1-3 mil plastic before creating the thermal break with a wood ceiling (or such)?
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Old 05-14-2018, 08:29 PM   #174
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I am definitely old so I can answer this one!!

Keep it!

Mine was similar (but yellow). I could find no reason to remove it and lots of reasons to keep it. No regrets.
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Old 05-14-2018, 08:32 PM   #175
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Originally Posted by MarkyDee View Post
That's the way my wife and I are leaning, but there is a definite smell to it. Its not a bad smell, mind you, but it is a tad annoying.


What about sealing everything up with some 1-3 mil plastic before creating the thermal break with a wood ceiling (or such)?
I'd be curious to find out what the material actually is, and its thickness.

I'd advise against adding yet another vapor barrier. Adding a second barrier will encourage any water vapor in the air that gets into the space, to condense out and have nowhere to go.
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Old 05-14-2018, 08:52 PM   #176
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I am definitely old so I can answer this one!!

Keep it!

Mine was similar (but yellow). I could find no reason to remove it and lots of reasons to keep it. No regrets.

Hahahaha! Its nice to be back working on the bus with you guys "riding shotgun"!



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I'd be curious to find out what the material actually is, and its thickness.

I'm not exactly sure what the material is, but I'll see if I can find out. However, I do know that the material is about an inch thick - along with the steel tubing that make up the skeleton. Its glued to the underside of the fiberglass roof. Poor roof needs a bit of repair as it cooked in the Houston sun for over a decade.



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I'd advise against adding yet another vapor barrier. Adding a second barrier will encourage any water vapor in the air that gets into the space, to condense out and have nowhere to go.

That's probably why the ceiling was some sort of "pegboard" with a felt underlay (well, overlay if you are going with gravity...). The "pegboard" and felt were riveted into place.


I'm thinking that the mildly annoying smell is coming from the foam. I was hoping to seal off the smell so it doesn't permeate my build. Maybe it just needs a good airing out? I do know that the roof has leaked in one or two places. Also, the roof topside does have some deep cracks.



Any ideas?
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Old 05-15-2018, 12:04 PM   #177
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Any ideas?
Ok, maybe I need to narrow down the question a bit:

Any ideas on how to fumigate the foam and make it smell better?
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Old 05-15-2018, 04:12 PM   #178
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A few inches of insulation is more ideal. I would seal it in some way like you're talking about and then add a couple more inches of XPS. Having several inches in the roof will make a big difference in keeping your temperatures how you want them. Although that will only do any good if you're deleting some of these windows of course
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Old 05-15-2018, 04:44 PM   #179
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Spray it down with Fabreze.
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Old 05-15-2018, 07:17 PM   #180
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A few inches of insulation is more ideal. I would seal it in some way like you're talking about and then add a couple more inches of XPS. Having several inches in the roof will make a big difference in keeping your temperatures how you want them. Although that will only do any good if you're deleting some of these windows of course

Yea, but I can't drop the ceiling too much more. I can't do a roof raise (huge roof-mounted HVAC), and my ceiling is only 6'6" from the floor.


And I am deleting windows. Of the 16 I will be deleting 6 of them for sure. However, I'm trying to get rid of more.


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Spray it down with Fabreze.

Yea, that's what my wife said after I posted the question. Its worth a try!
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