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Old 07-26-2021, 04:29 PM   #1
New Member
The Game is Afoot's Avatar
Join Date: Jun 2021
Location: Tulsa, OK
Posts: 9
Year: 2004
Coachwork: Bluebird
Chassis: 39' CS RE
Engine: ISC 8.3/Alisson B400R
KEEP old insulation?

Hey all -

So. Our bus has spray foam insulation. 1"
Removing it is proving to be a BEAST. 😂

Any tips or tricks?

We have also considered keeping it except for the parts that are really black.
Original intention was to use wool for eco-friendliness but the beast of work of scraping this stuff off has us reconsidering.

What would you do?
Pics attached.
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Old 07-26-2021, 04:33 PM   #2
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Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,228
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
Leave it, replace only what needs replacing. Most of us would use this type insulation if not for the expense and mess.
I Thank God That He Gifted Me with Common Sense
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Old 07-26-2021, 05:11 PM   #3
Bus Crazy
Join Date: Sep 2018
Posts: 2,339
Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
I’d be pretty happy to find that
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Old 07-26-2021, 07:08 PM   #4
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Join Date: Jan 2019
Location: Philadelphia
Posts: 6,026
Year: 2003
Coachwork: International
Chassis: CE 300
Engine: DT466e
Rated Cap: 65C-43A
The only downside to this particular stuff is that it's not completely flush with the insides of the ribs, so it's OK but not providing quite as much insulating value as you could get between the roof panels and the headliner (whatever you use for that). If this were my bus, I would add furring strips (either side-to-side on each rib or front-to-back across the ribs) and use spray foam to bring the insulation out flush with the insides of the furring strips (keeping what's there already in place).
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Old 07-26-2021, 08:18 PM   #5
Join Date: Jun 2021
Location: Minnesota
Posts: 59
Year: 2003
Coachwork: Bluebird
Chassis: International
Engine: DT466e
Rated Cap: 77
Is the black is it mildew? Test this out in a small area, try a little wash down with a towel soaking with water and 10% bleach maybe a little Dawn. If it's mildew it may disappear quick and easy.

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Old 07-26-2021, 09:18 PM   #6
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Join Date: Oct 2020
Location: Florida
Posts: 477
Coachwork: Integrated Coach Corp.
Chassis: RE-300 42ft
Engine: 466ci
Rated Cap: 90
Looks like soot from exaust. Particles travel through the wiremold from the RE where the harness passes into the engine bay.
Is it more prevelant where the harness trunk-line branches out? We had soot. Leaky buses.

I'd keep the insulation. Maybe add more foam, if you're able. Closed cell will encapsulate what's there. If it were mold (unlikely), just being present, while it's being pulverized, seems less healthy than the alternative, imho.
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"A man is worked upon by what he works on. He may carve out his circumstances, but his circumstances will carve him out as well."
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Old 07-26-2021, 11:17 PM   #7
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Join Date: Oct 2020
Location: Near Flagstaff AZ
Posts: 1,010
Like Danjo said...this would make me happy to see! It may not be enough insulation for your needs, but it's a good substrate for any additional insulation you want to add. Definitely don't rip it out.
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