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Old 11-01-2019, 02:33 PM   #1
Bus Nut
 
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Removing the ceiling panels

I remember sometime back replying to someone on this site saying, ďthe ceiling panels arenít structural!Ē

Now Iím worried about it.

On a Thomas Minotour is that interior ceiling panel providing shear strength? I tried to get photos of the unskinned from from Thomas, but no success.

On Saf-T-Liners I see that there are two longitudinal channels running the length. Is the Minotour the same?
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Old 11-01-2019, 06:35 PM   #2
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Originally Posted by Danjo View Post
I remember sometime back replying to someone on this site saying, ďthe ceiling panels arenít structural!Ē

Now Iím worried about it.

On a Thomas Minotour is that interior ceiling panel providing shear strength? I tried to get photos of the unskinned from from Thomas, but no success.

On Saf-T-Liners I see that there are two longitudinal channels running the length. Is the Minotour the same?
the ceiling panels do lend structural strength to the bus - they are what prevents the ribs from collapsing for and aft in case of an accident - the skin is thin, both inside and out, but like spokes in a bicycle wheel, the stress comes from pulling, not pushing, and the multi gazillion little screws and rivets make sure the skin holds the ribs in place
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Old 11-01-2019, 07:37 PM   #3
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Originally Posted by Sleddgracer View Post
the ceiling panels do lend structural strength to the bus - they are what prevents the ribs from collapsing for and aft in case of an accident - the skin is thin, both inside and out, but like spokes in a bicycle wheel, the stress comes from pulling, not pushing, and the multi gazillion little screws and rivets make sure the skin holds the ribs in place
There are a gazillion screws on the ceiling of a Minotour compared to the exterior which is relatively sparse.

I took a speaker off the ceiling and found the poly wool insulation looking pretty substantial. I know itís not near as good as the rigid stuff, but Iím going to hole saw some holes in it to do the anchors for the PV panels and cover it with that 1/4Ē T&G they sell at Lowes
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Old 11-01-2019, 08:36 PM   #4
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Originally Posted by Danjo View Post
I took a speaker off the ceiling and found the poly wool insulation looking pretty substantial.
I'll say pretty firmly... it doesn't matter. It wouldn't matter if there was magic insulation in the ceiling with an R value over 9000- the metal-to-metal connections throughout the ribs creates a thermal bridge.


I wasn't going to replace the ceiling panels, I thought hey, I'll be fine. Winter comes along, I point my thermal optic at the ceiling. Two inch wide, pitch black (coldest color) lines across the ceiling at every rib. I HATED taking down the ceiling, but no regrets. If you want to be comfortable in really low or really high temps, just do it.


And I honestly don't see why structural integrity is even a concern here. I don't plan on rolling my rig over.
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Old 11-02-2019, 01:32 AM   #5
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Originally Posted by kazetsukai View Post
I'll say pretty firmly... it doesn't matter. It wouldn't matter if there was magic insulation in the ceiling with an R value over 9000- the metal-to-metal connections throughout the ribs creates a thermal bridge.


I wasn't going to replace the ceiling panels, I thought hey, I'll be fine. Winter comes along, I point my thermal optic at the ceiling. Two inch wide, pitch black (coldest color) lines across the ceiling at every rib. I HATED taking down the ceiling, but no regrets. If you want to be comfortable in really low or really high temps, just do it.


And I honestly don't see why structural integrity is even a concern here. I don't plan on rolling my rig over.
Playing Devils Advocate, why does it matter that the ribs are a thermal bridge, you're never going to get 100% efficiency. I heard so many people say your wasting your time insulating if you don't do this or that. I say some insulation is better than none. and the thermal bridge the rib may make will be minor compared to the value of the insulation that large cavity. Without numbers, it's much ado about nothing.
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Old 11-02-2019, 02:45 PM   #6
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Originally Posted by o1marc View Post
Playing Devils Advocate, why does it matter that the ribs are a thermal bridge, you're never going to get 100% efficiency. I heard so many people say your wasting your time insulating if you don't do this or that. I say some insulation is better than none. and the thermal bridge the rib may make will be minor compared to the value of the insulation that large cavity. Without numbers, it's much ado about nothing.
Yeah this was my guiding principle for insulation. 100% efficiency is impossible, but if I can insulate as much as I can, then itís much better than it was before. I didnít insulate the forward cabinets because I wanted the extra space and figured the air gap was good enough, even though Iím losing like 3% insulation on the bus. But Iím still 80% better than with stock insulation. Same thing with the windowsóthey cover like 25% of the bus and have zero insulating capabilities, so what does it matter if I cover every little nook and cranny with insulation? Itís a little better, sure, but Iím okay leaving a few gaps between boards if it makes installation easier. But thatís just me and my lazy ass.
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