| Re: Interior Floor / Insulation [message #156473] |
Thu, 12 January 2012 14:09  |
bryant374
Messages: 563
Registered: May 2004
Location: Pleasant Valley, NY 12569
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Based on the records I have, 1" polyurethane floor insulation, floor structure & 3/4" treated plywood floor became available for model year 1975 (production after mid Dec. 1974) with some qualifiers:
Floor Insulation was aparently standard on 1975 and later GMC Motorhome interiors and an option "BRQ" on Transmodes.
1975 Transmodes show option "BRQ Insulation, floor pan" on the glove box sticker. Later Transmode production "Glove Box" identification seems spotty, In 1978 it became standard for all GMC models (along with a number of options that became standard that year, part of the reason the base price increased).
Floor insulation as an option shows up on the 1977 Transmode pricing as $95.00.
If any of you find an exception, for example glove Box sticker does not match option, to the above I would very much like feedback so that we may get the best record possible.
Thanks,
Bill
Bill Bryant
PO 1976~PB (owned 34 years)
1914 Ford (owned 70 years)
1965 Corvette (owned 39 years)
GMC Motorhome History
[Updated on: Thu, 12 January 2012 14:12] Report message to a moderator |
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| Re: [GMCnet] Interior Floor / Insulation [message #156485 is a reply to message #156473] |
Thu, 12 January 2012 14:48  |
Greg and April
Messages: 263
Registered: December 2011
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Does anyone have a picture of the floor insulation sandwich?
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Greg H.
I don't just march to the beat of my own drum - I have an entire brass band
to keep me company.
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----- Original Message -----
From: "Bill Bryant" <bryant374@earthlink.net>
To: <gmclist@temp.gmcnet.org>
Sent: Thursday, January 12, 2012 13:09
Subject: Re: [GMCnet] Interior Floor / Insulation
>
>
> Based on the records I have, 1" polyurethane floor insulation, floor
> structure & 3/4" treated plywood floor became available for model year
> 1975 with some qualifiers:
>
> Floor Insulation was aparently standard on 1975 and later GMC Motorhome
> interiors and an option "BRQ" on Transmodes.
>
> 1975 Transmodes show option "BRQ Insulation, floor pan" on the glove box
> sticker. Later Transmode production "Glove Box" identification seems
> spotty, In 1978 it became standard for all GMC models (along with a number
> of options that became standard that year, part of the reason the base
> price increased).
>
> Floor insulation as an option shows up on the 1977 Transmode pricing as
> $95.00.
>
> If any of you find an exception, for example glove Box sticker does not
> match option, to the above I would very much like feedback so that we may
> get the best record possible.
> Thanks,
> Bill
> --
> Bill Bryant
> 1976~PB
> 1914 Ford
> 1965 Corvette
> GMC MH History CD
> GMC Showroom Films DVD
> http://bdub.net/billbryant/
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| Re: Interior Floor / Insulation [message #156534 is a reply to message #156473] |
Thu, 12 January 2012 21:20 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| bryant374 wrote on Thu, 12 January 2012 14:09 |
Floor Insulation was aparently standard on 1975 and later GMC Motorhome interiors and an option "BRQ" on Transmodes.
1975 Transmodes show option "BRQ Insulation, floor pan" on the glove box sticker.
|
Yep - that matches my transmode. See the sticker here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29750
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Interior Floor / Insulation [message #156544 is a reply to message #156519] |
Thu, 12 January 2012 22:41 |
noi
Messages: 293
Registered: October 2010
Location: South of Fremont
Karma: 0
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Rob:
Sorry for the confusion – I just grabbed a bunch of “insulation” pictures out of my restoration progress folder so that Greg would get a better idea of what the insulation looked like under the plywood – So to answer your questions directly….
“From the photos it looks like the floor above the mufflers was insulated but the rest wasn't?”
Nope, every “bay” had foam insulation in it – Again, pictures were just grabbed quickly and sorta out of order – But in a nut shell it was…. Aluminum sheet (bottom), foam sheet/spray foam (middle), plywood flooring (top).
The foam over the muffler area appeared to be “sprayed” in as it stuck to the plywood and aluminum sheeting – I had to peel the aluminum off and then scrap the foam off the plywood – I think the reason for this is that the “well” for the hold down clamp was in that area and it was quicker to spray it in rather than cut the foam out – In this picture you can see the ‘well”, partially pulled up aluminum sheeting, and signs of foam “squeeze out” around the edges:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=42231&title=1112&cat=5986
The rest of the bays were aluminum/foam sheet/plywood:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=42241&title=424&cat=5986
“What is the insulation material you used?”
Pictures are of progress to date – I am a ways away from needing to insulate, but will most likely use Owens Corning Foamular – Can get it locally and has pretty good r-value ( space for about 1.5”=r-7)
“Did you glue the sheet metal to the bottom of the insulation material?”
“If yes what glue did you use?”
I plan to glue the foam insulation to the aluminum, but haven’t decided what adhesive to use – Most likely I will use a 3m high performance contact adhesive.
Hope this answers your questions,
Carl P.
76 Birchaven
South of Fremont
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| Re: [GMCnet] Interior Floor / Insulation [message #357537 is a reply to message #357534] |
Fri, 07 August 2020 08:37 |
mghamms
Messages: 466
Registered: March 2016
Location: Ware, Massachusetts
Karma: 2
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Whenever I look at the pictures of the insulation I always amazed at the low quality of the GM work.
The GM penny pinchers always seem to win. Quality looses. And they get bailed out.
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
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| Re: [GMCnet] Interior Floor / Insulation [message #357562 is a reply to message #357534] |
Fri, 07 August 2020 20:41 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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There are few drawbacks and a number of advantages to laminating two layers of plywood together to build up floor panels of sufficient thickness. If you've ever seen the common rot underneath the GMC cockpit windows you'll know that the "marine plywood" did not like water at all. Treated plywood with a coating of epoxy resin, or at least a couple of coats of oil-based paint, on all sides and surfaces before installation of the floor panels would last well into subsequent ownerships.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| Re: [GMCnet] Interior Floor / Insulation [message #357563 is a reply to message #156496] |
Fri, 07 August 2020 21:06 |
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74_Coach
Messages: 71
Registered: July 2019
Location: Arroyo Grande, CA
Karma: 0
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noi wrote on Thu, 12 January 2012 14:01Greg - Some pictures you may find of interest.
http://www.gmcmhphotos.com/photos/showgallery.php?cat=5986
Carl P.
76 Birchaven
South of Fremont
Interesting pictures but hate that website image navigation design. Any chance you have a link to images showing the upper cab flooring in detail? I need to replace the passenger floor because of water damage and need to know what I am getting into.
Ed Clerkin | 1974 GMC Canyon Lands 26’
Central Coast CA
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