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Old 03-23-2016, 11:02 PM   #1
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Insulation Opinions needed - styrofoam?

Okay, so I was planning on doing spray foam on the ceiling and side panels, or a combination of insulated foam board and spray. BUT when I started taking panels off the inside of the bus, here's what I found:



Some type of dense styrofoam insulation. It's cut to fit the spaces, and a little bit of spray foam in a can could probably seal up any gaps. Any idea if this is worth keeping? Just tell me if I'm crazy. I realize this is insulation tech from 1988, so maybe not a good idea to keep. it would save some work though (it's already cut pretty well, I wouldn't have to find a place to dispose of it, and I wouldn't have to buy new insulation. Or I could leave it in, and add another 1/2" - 1" or so of spray foam on top of it? I'm planning on doing a wood ceiling, and wood paneling on the sides, so not a problem to leave space for a little additional insulation.

A few more photos:


These are some of the panels that were in the ceiling (I took down one ceiling section, a few of these fell out, some were still jammed in the ceiling spaces)





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Old 03-24-2016, 06:16 AM   #2
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That old stuff is more for noise reduction instead of real insulation. I sincerely doubt there is any real R value in that stuff. You're better off going to a product that has real R value and you'll also get the sound reduction as a bonus. In addition, look at the mold. You really want to get rid of that health issue!

Just my two cents.

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Old 03-24-2016, 07:11 AM   #3
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I agree with M1031, that mold would eventually penetrate into the wood itself. Make sure to seal the outside so no moisture can get in to your new insulation too!
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Old 03-24-2016, 07:33 AM   #4
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Dang, I knew Gilligs were nice, but that's cool. Syrofoam is a much better choice of material for the job that the nasty fiberglass in the rest of our buses.
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Old 03-24-2016, 08:29 AM   #5
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Agreed with all of the above. Definitely get rid of the old stuff, replace with new spray or solid.
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Old 03-24-2016, 08:58 AM   #6
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I want a Gillig school bus. They're just so awesome.

Rad bus, man. Keep us updated with pics, please!
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Old 03-24-2016, 09:18 AM   #7
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Quote:
Originally Posted by M1031A1 View Post
That old stuff is more for noise reduction instead of real insulation. I sincerely doubt there is any real R value in that stuff. You're better off going to a product that has real R value and you'll also get the sound reduction as a bonus. In addition, look at the mold. You really want to get rid of that health issue!

Just my two cents.

M1031
Thanks! Appreciate the feedback. It's actually just dirt in those photos, not mold. The aluminum panel that I removed overlaps the window sill, so dirt/dust can filter down (or get washed down, if there's condensation on the windows, which would then drip down the walls and into that crack, then as kids sit up against the panel, it would rub right in the middle, which looks like what creates that larger dirty patch in the middle where the panel flexes more.

But that being said, going with a product that has better R value seems like a better choice anyway, especially since I'm planning on another layer on top of this anyway, to cover the metal rails that the current insulation is sitting between.
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Old 03-24-2016, 01:01 PM   #8
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Closed cell foam board.
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Old 03-24-2016, 06:15 PM   #9
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If that is dirt and not mold, I would leave them and just add a layer on top. Are you going to full time in the bus or just camp?
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Old 03-24-2016, 09:10 PM   #10
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somewhere in between... live in it for up to a month or two at a time. But we're in the pacific north west, and it doesn't usually get below freezing (and we probably won't be in it very often if it does).

What if I left the foam insulation that's in there, filled in any cracks with Great Stuff, then put another 1/2" panel of rigid foam insulation over top of it on the ceiling (don't want to go thicker since I want to conserve headroom), and 1" on the sides. I'm keeping all the windows (will put up insulated curtains). Obviously, replacing all the styrofoam would be best... but just not sure how much I want to spend on this.

Still thinking it over at this point...
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