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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

Karma:

Senior Member

USAussie wrote on Sat, 17 October 2015 01:44

Mark,

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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[Message index]

		Different Model Year Floor Insulation Question By: A Hamilto on Fri, 16 October 2015 15:21
		Re: Different Model Year Floor Insulation Question By: kerry pinkerton on Fri, 16 October 2015 15:35
		Re: [GMCnet] Different Model Year Floor Insulation Question By: sgltrac on Fri, 16 October 2015 15:39
		Re: [GMCnet] Different Model Year Floor Insulation Question By: A Hamilto on Fri, 16 October 2015 16:02
		Re: [GMCnet] Different Model Year Floor Insulation Question By: sgltrac on Fri, 16 October 2015 16:40
		Re: [GMCnet] Different Model Year Floor Insulation Question By: A Hamilto on Fri, 16 October 2015 17:50
		Re: [GMCnet] Different Model Year Floor Insulation Question By: Jp Benson on Fri, 16 October 2015 17:59
		Re: [GMCnet] Different Model Year Floor Insulation Question By: A Hamilto on Fri, 16 October 2015 18:51
		Re: [GMCnet] Different Model Year Floor Insulation Question By: USAussie on Fri, 16 October 2015 19:31
		Re: [GMCnet] Different Model Year Floor Insulation Question By: A Hamilto on Fri, 16 October 2015 20:30
		Re: [GMCnet] Different Model Year Floor Insulation Question By: USAussie on Fri, 16 October 2015 22:56
		Re: [GMCnet] Different Model Year Floor Insulation Question By: A Hamilto on Sat, 17 October 2015 00:06
		Re: [GMCnet] Different Model Year Floor Insulation Question By: USAussie on Sat, 17 October 2015 01:44
		Re: [GMCnet] Different Model Year Floor Insulation Question By: Mr ERFisher on Sat, 17 October 2015 05:50
		Re: [GMCnet] Different Model Year Floor Insulation Question By: Jp Benson on Sat, 17 October 2015 08:26
		Re: Different Model Year Floor Insulation Question By: Adrien G. on Fri, 16 October 2015 22:47

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