Interior Floor / Insulation

[gdbeckst]

Sorry to revive an old post, but I am currently replacing the floors in my 73 and have found it difficult to get 1” marine grade plywood (what it
has originally) locally.

So I’m interested in “upgrading” to the later floor style.

Anyone have details on what gauge aluminum sheet was used? Are my aluminum floor supports different? They look like they might have bigger flanges but
I’m not sure.

 

[mghamms]

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

 

[bdub]

I think that the foam was blown in for noise abatement, to keep the
aluminum from drumming. They were successful with that. The minor
insulation value was a secondary benefit.

bdub

On Fri, Aug 7, 2020 at 8:37 AM Mike Hamm via Gmclist <

> 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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> GMCnet mailing list
> Unsubscribe or Change List Options:
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[Richard RV]

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 with 18,477 verified miles;
‘76 Edgemonte

 

[74_Coach]

> Greg - 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’