GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » Floor insulation question (Seeking product recommendation )
Floor insulation question [message #352337] Sat, 22 February 2020 20:53 Go to next message
Green machine is currently offline  Green machine   Canada
Messages: 184
Registered: July 2019
Location: North Vancouver BC
Karma: 5
Senior Member
Hello again GMC braintrust!

Continuing along with my complete overhaul... I have painted the frame with por15 and have put the fuel tanks back in after a refresh. I will get to the black tank at some point. Tomorrow I will get the new fuel lines installed. I am getting close to being able to get new floors in and wondered what everyone is using as a replacement for the hard floor insulation from the factory. Mine busted all to bits pulling it all out and I'm not sure I would have reused it anyway. Looks like the old stuff was 1" and must've had some heat rating for the exhaust.

As always, any help is much appreciated.




Shawn Harris North Vancouver, Canada 1977 Palm Beach 403
Re: Floor insulation question [message #352344 is a reply to message #352337] Sun, 23 February 2020 11:49 Go to previous messageGo to next message
Jp Benson is currently offline  Jp Benson   United States
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
Senior Member
I couldn't find a foam/aluminum bonded panel to match the factory setup. The 3/4" RMAX was topped off with micro-foil to fill the space. Everything is bonded in place with RTV.

http://www.gmcmhphotos.com/photos/g6673-floor.html

JP
Re: Floor insulation question [message #352422 is a reply to message #352337] Wed, 26 February 2020 12:48 Go to previous messageGo to next message
Green machine is currently offline  Green machine   Canada
Messages: 184
Registered: July 2019
Location: North Vancouver BC
Karma: 5
Senior Member
In case someone reads this down the road I found this product that I believe will work very well. Its rigid and has a very high heat rating. Only issue is the thinnest available is 1 1/4". I will be buying the 2" which is quite readily available and will be cutting it in half. Will provide feedback after install. Oh! And it's reasonably inexpensive as well.

Cheers

https://www.rockwool.com/products/comfortboard-80/?selectedCat=comfortboard%E2%84%A2%2080%20downloads#Specifications&Sizes

https://www.homedepot.ca/product/rockwool-comfortboard-80/1000737930


Shawn Harris North Vancouver, Canada 1977 Palm Beach 403
Re: Floor insulation question [message #352467 is a reply to message #352422] Fri, 28 February 2020 06:24 Go to previous messageGo to next message
Rich Kinas is currently offline  Rich Kinas   United States
Messages: 113
Registered: July 2019
Karma: 1
Senior Member
I'm redoing my floors as well and am planning on using Roxul minerla wool high temperatore unsulation density #8 green 1.5"x24"x48" is less than 20 bucks.

Rich


Rich Kinas 1976 Elaganza II Orlando, FL
Re: Floor insulation question [message #352484 is a reply to message #352467] Fri, 28 February 2020 12:52 Go to previous messageGo to next message
Green machine is currently offline  Green machine   Canada
Messages: 184
Registered: July 2019
Location: North Vancouver BC
Karma: 5
Senior Member
Rich Kinas wrote on Fri, 28 February 2020 06:24
I'm redoing my floors as well and am planning on using Roxul minerla wool high temperatore unsulation density #8 green 1.5"x24"x48" is less than 20 bucks.

Rich

Well we will have a couple reviews then! Upon further investigation I found they actually have 1.25 " available on their website. I'm trying to find a retailer who will bring it in. You don't think 1.5" will be compressed too much?

Shawn


Shawn Harris North Vancouver, Canada 1977 Palm Beach 403
Re: Floor insulation question [message #353806 is a reply to message #352337] Tue, 14 April 2020 22:28 Go to previous messageGo to next message
Green machine is currently offline  Green machine   Canada
Messages: 184
Registered: July 2019
Location: North Vancouver BC
Karma: 5
Senior Member
Just a quick update...I ended up buying 2" and spitting down the middle. I'm glad i did because this stuff does not compress much at all! I used a 24" english bow saw with my wife ensuring i was staying straight on the far end. Easy as pie. Cuts like a dream. Mold proof, fire resistant and rigid. If there is a better product for this application, I would be surprised.

The pack comes with 6 sheets so 12 in half. I'll update if that does the whole floor. I suspect I'll need one or two extra sheets unfortunately. We shall see. Too much of a PITA to upload photos or I would.


Shawn Harris North Vancouver, Canada 1977 Palm Beach 403
Re: [GMCnet] Floor insulation question [message #353930 is a reply to message #353806] Mon, 20 April 2020 05:55 Go to previous message
Rich Kinas is currently offline  Rich Kinas   United States
Messages: 113
Registered: July 2019
Karma: 1
Senior Member
So you ended up with 1" thick slabs, just to make sure I am following you.
I am just trying ti finish up my front end rebuild to finally get onto the
floors. Do you think the 1 1/2 " would be too thick?

Thanks,

Rich

On Tue, Apr 14, 2020 at 11:28 PM Shawn Harris via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Just a quick update...I ended up buying 2" and spitting down the middle.
> I'm glad i did because this stuff does not compress much at all! I used a
> 24"
> english bow saw with my wife ensuring i was staying straight on the far
> end. Easy as pie. Cuts like a dream. Mold proof, fire resistant and rigid.
> If
> there is a better product for this application, I would be surprised.
>
> The pack comes with 6 sheets so 12 in half. I'll update if that does the
> whole floor. I suspect I'll need one or two extra sheets unfortunately. We
> shall see. Too much of a PITA to upload photos or I would.
> --
> Shawn Harris
> North Vancouver,
> Canada
> 1977 Palm Beach 403
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org



Rich Kinas 1976 Elaganza II Orlando, FL
Previous Topic: [GMCnet] Blackberry Wars was Gary Bunzer has passed
Next Topic: Wiring new Onan Switch
Goto Forum:
  


Current Time: Thu Sep 19 16:15:23 CDT 2024

Total time taken to generate the page: 0.01426 seconds