| Different Model Year Floor Insulation Question [message #288858] |
Fri, 16 October 2015 15:21  |
A Hamilto
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The early models had a plywood floor. By the end of production, there was a layer of metal on the bottom, some insulation, then plywood.
Did that affect the ceiling height? If not, how was that avoided?
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| Re: [GMCnet] Different Model Year Floor Insulation Question [message #288860 is a reply to message #288859] |
Fri, 16 October 2015 15:39  |
sgltrac
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the insulation was only between the floor stringers
Sully
77 royale
seattle
On Fri, Oct 16, 2015 at 1:35 PM, Kerry Pinkerton
wrote:
> No, it was on the bottom of the plywood and just raised the total height
> of the coach .063.
> --
> Kerry Pinkerton - North Alabama
>
> 77 Eleganza II, 403CI, Manny Brakes, 1 ton, tranny, lots of aluminum
> goodies.
>
> http://www.bdub.net/pinkerton/
>
> '03 Fleetwood Discovery 39L
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Different Model Year Floor Insulation Question [message #288862 is a reply to message #288861] |
Fri, 16 October 2015 16:40 |
sgltrac
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IIRC it is a bunch of sheared rectangles and just lays in bottom of the
floor framing and then the foam is laid on top of it and ends up flush with
the stringers
Sully
77 royale
seattle
On Fri, Oct 16, 2015 at 2:02 PM, A. wrote:
> sgltrac wrote on Fri, 16 October 2015 15:39
>> the insulation was only between the floor stringers
>> Sully
>> 77 royale
>> seattle
> Is the metal (aluminum?) attached to the bottom of the aluminum frame of
> the floor?
> --
> '73 23' Sequoia For Sale
> '73 23' CanyonLands For Sale
> Upper Alabama
> There will always be a demand for scapegoats. The job sucks, but the work
> is steady.
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Different Model Year Floor Insulation Question [message #288866 is a reply to message #288862] |
Fri, 16 October 2015 17:50 |
A Hamilto
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sgltrac wrote on Fri, 16 October 2015 16:40IIRC it is a bunch of sheared rectangles and just lays in bottom of the floor framing and then the foam is laid on top of it and ends up flush with the stringers
Sully
77 royale
seattle That would make sense. Maybe if one ever had to take the plywood floor out of one of the older ones, they could retrofit it with the bottom layer of metal and insulation.
[Updated on: Fri, 16 October 2015 17:52] Report message to a moderator |
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| Re: Different Model Year Floor Insulation Question [message #288885 is a reply to message #288858] |
Fri, 16 October 2015 22:47 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
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A Hamilto wrote on Fri, 16 October 2015 15:21The early models had a plywood floor. By the end of production, there was a layer of metal on the bottom, some insulation, then plywood.
Did that affect the ceiling height? If not, how was that avoided?
My understanding is that the floor systems of 73 & 74 are not the same as 75 and later,
I help work on a 73, and was surprised to see the plywood floor be directly on top the isolator
strip. With either alum angle or tee bars between floor sheet joints.
By lifting the body a sheet of alum could be added for heat or moisture shield.
But not any foam insulation. The area at the APU (auxiliary power unit) may show how it is.
Whether that makes a difference in interior head room, I have no clue.
Someone else in a higher pay grade then me may be able to add to the head room question.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: [GMCnet] Different Model Year Floor Insulation Question [message #288897 is a reply to message #288893] |
Sat, 17 October 2015 08:26 |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
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USAussie wrote on Sat, 17 October 2015 01:44Mark,
Here you go:
Tiny URL: http://tinyurl.com/pyrjqdq
Full URL:
https://www.google.com.au/search?q=aluminum+/+styrofoam+insulation+panels&espv=2&biw=1024&bih=681&tbm=isch&tbo=u&source=univ&a mp;a mp;sa=X&ve
d=0CBsQsARqFQoTCOKszZ_zyMgCFeQkpgodlhsJFQ
Regards,
Rob M.
The Pedantic Mechanic
I went through this drill. The original floor had an 18 gauge aluminum skin bonded to 3/4" polyiso foam. The rigid foam was stiff enough to keep the aluminum from sagging as long as the glue held. Except for the area over the mufflers it all held up well for almost 40 years. I spent a good amount of time and effort searching for this same combination. No luck. Lots of vendors sell polystyrene foam bonded to aluminum panels. Usually way too thick for the GMC floor. I would not use polystyrene foam near a heat source as it is a thermoplastic material. Polyiso foam is thermoset and more suited to the task in my opinion.
Modify Rob's search criteria to "aluminum/polyiso insulation panels" and find someone who will sell you the correct thickness panel with an 18 gauge bonded aluminum skin (on one side) and guaranteed to withstand road conditions. Hopefully at a reasonable price including delivery. They must be out there somewhere and it would certainly simplify the task.
It was a bit of a hassle to get unfaced polyiso foam, 18 gauge sheet aluminum, an adhesive that would reliably hold them together and then fabricate and cut to size. Instead, I installed 1/16" diamond plate that would support it's own weight then added polyiso foam panels that I could buy at a local big box store.
It's all held in place with plenty of high temp silicone adhesive from siliconesolutions.com.
JP
JP
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