Home » Public Forums » GMCnet » [GMCnet] Removing ALL the sprayed on insulation
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241295 is a reply to message #241292] |
Tue, 25 February 2014 08:35   |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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I did not try to remove it 'ALL' but just finished redoing the headliner and left side. I used a flexible butcher knife with a blade I could bend easily. It just slid through the foam. I could twist the blade and it would pop off. I was mainly interested in leveling it so I could add a 1" styrofoam piece. Gaps were filled with spray foam (Great Stuff).
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241307 is a reply to message #241278] |
Tue, 25 February 2014 10:03 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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Rob,
I've been removing mine using my oscillating or"wiggly" saw, the Fein multi master. It is quite effective and quick. There are several variations of the Fein tool, the cheapest being from Harbor Freight for $20.
BTW, I'm using rigid foam between the ribs but, since the ribs themselves transmit a lot of heat, I'm adding an additional 1/2 inch under the ribs. I'm able to get 1 3/4 to 2 inches throughout the ceiling.
Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241335 is a reply to message #241278] |
Tue, 25 February 2014 13:31 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
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Rob,
I had thought about doing that. But, at the Goshen rally I was parked next to a Canadian couple, (don't remember their names) and he said the foam adds more to structure than you might think. He convinced me that I was better off just leveling off and adding more sheet foam insulation to it. Not sure how much the glued on foam helps, but it did make sense to me. I still haven't finished my ceiling, as I have about 2 million water leaks to chase first.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241338 is a reply to message #241290] |
Tue, 25 February 2014 13:42 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Or a large coarse wire brush in an electric drill. Equally messy though not as fume laden. Although, the dust would probably be flammable/explosive in the air. I'd be careful.
--johnny
________________________________
From: Kerry Pinkerton <Pinkertonk@MCHSI.com>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, February 25, 2014 9:21 AM
Subject: Re: [GMCnet] Removing ALL the sprayed on insulation
How big a mess are you willing to make? I think acetone will dissolve it.
--
Kerry Pinkerton
North Alabama, near Huntsville,
77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as an Art Deco car hauler
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241351 is a reply to message #241335] |
Tue, 25 February 2014 15:25 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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| Craig Lechowicz wrote on Tue, 25 February 2014 12:31 |
Rob,
I had thought about doing that. But, at the Goshen rally I was parked next to a Canadian couple, (don't remember their names) and he said the foam adds more to structure than you might think. He convinced me that I was better off just leveling off and adding more sheet foam insulation to it. Not sure how much the glued on foam helps, but it did make sense to me. I still haven't finished my ceiling, as I have about 2 million water leaks to chase first.
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Rob,
I concur with the above. The urethane foam insulation is a very efficient insulation system. It has more R-value per inch than most anything reasonably available. It only makes sense that it adds structural rigidity to the body, along with sound deadening. If you remove it and don't replace it with another spray foam system, I would think you would run the risk of having noises from the insulation shifting between the wall surfaces.
One of the best examples of re-insulating I have seen was this one by Norman Wheatley:
http://www.gmcclassics.com/tech/wheatley/Wheatley75E2Rebuild.pdf
He shaved down the factory insulation to a uniform thickness and added another inch on the inside of it. This method maintained the factory foam's bond to the outside skin of the coach.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241355 is a reply to message #241351] |
Tue, 25 February 2014 15:36 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Has anyone tried the blanked aerogel that was mentioned back on Jan 1?
Pricey, but good R value, and it will not burn, unlike most foams.
On Tue, Feb 25, 2014 at 1:25 PM, Carl Stouffer <carljr3b@yahoo.com> wrote:
>
>
> Craig Lechowicz wrote on Tue, 25 February 2014 12:31
> > Rob,
> > I had thought about doing that. But, at the Goshen rally I was parked
> next to a Canadian couple, (don't remember their names) and he said the
> foam adds more to structure than you might think. He convinced me that I
> was better off just leveling off and adding more sheet foam insulation to
> it. Not sure how much the glued on foam helps, but it did make sense to
> me. I still haven't finished my ceiling, as I have about 2 million water
> leaks to chase first.
>
>
>
> Rob,
>
> I concur with the above. The urethane foam insulation is a very efficient
> insulation system. It has more R-value per inch than most anything
> reasonably available. It only makes sense that it adds structural rigidity
> to the body, along with sound deadening. If you remove it and don't
> replace it with another spray foam system, I would think you would run the
> risk of having noises from the insulation shifting between the wall
> surfaces.
>
> One of the best examples of re-insulating I have seen was this one by
> Norman Wheatley:
>
> http://www.gmcclassics.com/tech/wheatley/Wheatley75E2Rebuild.pdf
>
> He shaved down the factory insulation to a uniform thickness and added
> another inch on the inside of it. This method maintained the factory
> foam's bond to the outside skin of the coach.
> --
> Carl S.
> '75 ex Palm Beach
> Tucson, AZ.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Plato seems wrong to me today.
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1973 26' GM outfitted
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241356 is a reply to message #241278] |
Tue, 25 February 2014 15:44 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Rob,
Check this post from last year. I posted a lot of insulation and window tint info from March through July last year.
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=200404&rid=267#page_top
This tool does the job if you can find one.
Glenn,
I don't know what a wiggly saw is. I was lucky to borrow a tool from an automotive glass shop to remove the OEM foam. The tool is like a reciprocating saw motor but the blade is like a large flexible spatula. With this tool I was able to remove all the ceiling and some of the wall foam in 2 hours. The tool removes the foam in large slabs.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241359 is a reply to message #241356] |
Tue, 25 February 2014 16:03 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Rob,
Although I did not remove ALL of the insulation from the pig I did remove a bunch of it in a couple different ways.
Flexible metal putty knif slid under and pry out. This worked well but the chunks were too big and clog the shopvac.
Wire wheel in a grinder. This was just a little slower but fragments vacuum up easy.
Hope this helps
Todd Sullivan
Sully
77 royale
Seattle
> On Feb 25, 2014, at 1:44 PM, gene barrow <barrowgene@gmail.com> wrote:
>
>
>
> Rob,
> Check this post from last year. I posted a lot of insulation and window tint info from March through July last year.
>
> http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=200404&rid=267#page_top
>
> This tool does the job if you can find one.
>
> Glenn,
> I don't know what a wiggly saw is. I was lucky to borrow a tool from an automotive glass shop to remove the OEM foam. The tool is like a reciprocating saw motor but the blade is like a large flexible spatula. With this tool I was able to remove all the ceiling and some of the wall foam in 2 hours. The tool removes the foam in large slabs.
>
>
>
>
>
> --
> Gene Barrow
> Lake Almanor, Ca.
> 1976 Palm Beach
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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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] Removing ALL the sprayed on insulation [message #241360 is a reply to message #241278] |
Tue, 25 February 2014 16:18 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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Rob,
The "wiggly"saw is a Fein MultiMaster or one of the similar knockoff's. The blade oscillates or wiggles back and forth. Cheapest is $20 from Harbor Freight. I used it with one of the toothless blades (much like the end of a putty knife).
Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241370 is a reply to message #241355] |
Tue, 25 February 2014 17:53 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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| Ronald Pottol wrote on Tue, 25 February 2014 14:36 |
Has anyone tried the blanked aerogel that was mentioned back on Jan 1?
Pricey, but good R value, and it will not burn, unlike most foams.
|
There's a tri-polymer spray foam insulation that's used in construction that insulates almost as well as polyurethane, doesn't burn and doesn't cost an arm and a leg like aerogel. Don't recall the brand name, but google it and you'll find it.
Simply filling the stud cavity fully will provide all the insulation you'll ever need. GMC's 3/4" insulation was a specification that varied greatly in practice.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241402 is a reply to message #241278] |
Tue, 25 February 2014 19:33 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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One comment about using an air chisel. I work with .063 3003 H14 aluminum daily and it is soft stuff. You could VERY easily put a dent it it with any power tool, sawsall, air hammer, even a vibrating thingey if you were not careful.
Just my three cents.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241422 is a reply to message #241402] |
Tue, 25 February 2014 21:08 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Kerry,
Thanks, however, I could have sworn that someone mentioned that the aluminum that GMC used was typical aircraft 6061 T6?
Either way I WILL be careful not to create more problems than I cure!
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Kerry Pinkerton
One comment about using an air chisel. I work with .063 3003 H14 aluminum daily and it is soft stuff. You could VERY easily put a
dent it it with any power tool, sawsall, air hammer, even a vibrating thingey if you were not careful.
Just my three cents.
--
Kerry
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241423 is a reply to message #241411] |
Tue, 25 February 2014 21:10 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Carl,
I must apologize I did NOT read all the details on the chisel you referenced, I assumed it was metal. Now that you've noted that you
and Kerry have advised caution I will see if I can't make a plastic blade for it.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of noi
Rob,
Just to clarify....
The Aircraft Spruce air chisel I referenced is "plastic", it is not metal - Not to say you don't have a plastic air chisel, but the
way you spoke of the one you had led me to think "metal".
Kerry P. is quite correct - I "gouged" a couple of places, while I was scraping out my foam, when I got a bit careless (tired) in a
few places using 1" putty scraper.
Carl P.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Removing ALL the sprayed on insulation [message #241428 is a reply to message #241423] |
Tue, 25 February 2014 21:47 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Rob,
The tool I mentioned is used by glass shops to remove glued in windshields from cars. Even though it has a metal blade, when used properly it does not break the windshields and it doesn't dent the aluminum skin on the GMC. I was more concerned about damaging the SMC plastic. That wasn't a problem either.
The spatula blade is ~3-4 inches wide- it spreads the load and removes large chunks of the insulation each time it is applied.
Good luck with the project.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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