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Old 06-29-2019, 07:09 PM   #1
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Collins bus ceiling insulation questions

I have a 6-window Collins which I'm converting to a weekend camper. I've ripped out the ceiling, insulation, and fixed the leaks. I'm planning on XPS foam board in roof. I'm 6'2" without shoes and the roof ribs are about 6'3" off my new floor right now, so headroom is at a premium. For the ceiling, I plan to install 1/4" plywood, so nothing fancy. The ribs in the bus walls and ceiling are 1 1/4" deep, but foam board comes in 1" and 1 1/2". Would it be best to just put 1" in the ceiling and screw the plywood to the ribs? I know I'm not eliminating thermal bridging this way, but for my use and desire to not lose headroom, I think this is fine, especially given the original bus windows and door are staying for now.

Any thoughts on how I could improve the ceiling insulation/bridging situation, without losing much headroom? Would 1 1/2" foam board be any more helpful? Is it worth the hassle given the rib height of 1 1/4"? Any alternative ways to attach the ceiling panels to avoid the bridging, especially if I were to go with 1 1/2" insulation?

Thanks!
Chris
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Old 06-29-2019, 07:31 PM   #2
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Where are you finding rigid insulation in 1-1/2"?
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Old 06-29-2019, 09:31 PM   #3
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The Home Depot in town sells it in 1/2", 1", 1 1/2", and 2" (or at least their web site says they do). Lowes only sells 1" and 2".

Maybe I should make sure the local Home Depot actually stocks what their web site says they should... haha
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Old 06-29-2019, 09:56 PM   #4
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Quote:
Originally Posted by farok View Post
The Home Depot in town sells it in 1/2", 1", 1 1/2", and 2" (or at least their web site says they do). Lowes only sells 1" and 2".

Maybe I should make sure the local Home Depot actually stocks what their web site says they should... haha
I think you are mistaken. Formular Rigid Pink comes in 4 thickness', starting at 1/4" and doubling in size up to 2" (1/4", 1/2", 1", 2"). I would have used 1-1/2" instead of layering 1" and 1/2" to get to 1-1/2". It's not on their website.
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Old 06-30-2019, 12:33 AM   #5
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1 1/2 Foam board



https://www.homedepot.com/p/R-Tech-1...0817/202532855
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Old 06-30-2019, 12:38 AM   #6
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Formular 1 1/2" pink


https://www.homedepot.com/p/Owens-Co...88WD/202085958
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Old 06-30-2019, 12:39 AM   #7
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Be nice if they actually had some somewhere.
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Old 06-30-2019, 07:10 AM   #8
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I'll have to check my local store, but back to the original question, any concerns with just putting 1" foam into my 1 1/4" cavity, and screwing the ceiling panels to the roof ribs? Better ways to do it? Thanks.

Chris
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Old 06-30-2019, 07:24 AM   #9
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Originally Posted by farok View Post
I'll have to check my local store, but back to the original question, any concerns with just putting 1" foam into my 1 1/4" cavity, and screwing the ceiling panels to the roof ribs? Better ways to do it? Thanks.

Chris
Seems like a good compromise to me, man. Better than nothing and you won't be losing any headroom.
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Old 06-30-2019, 09:23 AM   #10
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Thanks for the insight!
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