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| [GMCnet] Ceiling Insulation [message #210362] |
Sat, 08 June 2013 16:16  |
larry erd
Messages: 132
Registered: August 2010
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I would never remove the foam in a GMC ceiling, It adds a lot of rigidity
to the
roof, The roof will buckle a lot more when walking on it. The foam is part
of the
structure. I added 200 board feet of Tiger spray foam (non flammable) for
almost
a flush to the ribs, than glued the Mylar bubble wrap over the hole ceiling
and glued
another layer of bubble to1/4" plywood, than my foam backed headliner
material.
I have only one 15000 BTU Penguin AC, it works great here in Florida.
Larry Erd
77 exKingley
Lake Wales, FL.
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| Re: [GMCnet] Ceiling Insulation [message #210396 is a reply to message #210362] |
Sat, 08 June 2013 20:31  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Larry,
I'm sorry but I'm going to disagree with you on this.
The roof skin is epoxied / riveted to the outside of the aluminum frame, if there was another skin epoxied / riveted to the inside
of the aluminum frame and the void between the two completely filled with spray foam insulation and it bonded to both surfaces then
I would agree it would make the roof much stiffer.
Things that make you go hmmmmmmm?
Regards,
Rob M.
-----Original Message-----
From: Larry Erd
I would never remove the foam in a GMC ceiling, It adds a lot of rigidity to the
roof, The roof will buckle a lot more when walking on it. The foam is part of the
structure. I added 200 board feet of Tiger spray foam (non flammable) for almost
a flush to the ribs, than glued the Mylar bubble wrap over the hole ceiling and glued
another layer of bubble to1/4" plywood, than my foam backed headliner material.
I have only one 15000 BTU Penguin AC, it works great here in Florida.
Larry
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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] Ceiling Insulation [message #210401 is a reply to message #210396] |
Sat, 08 June 2013 20:45 |
mickeysss
Messages: 1476
Registered: January 2012
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specials@adventurerv.net
1500 no heat ac for 559 dollars, is it better if you have one to get the 1500 or the 1350, for the onan to start it. which one to get?
mickey 77 palm beach anaheim ca.
On Jun 8, 2013, at 6:31 PM, Rob Mueller wrote:
> Larry,
>
> I'm sorry but I'm going to disagree with you on this.
>
> The roof skin is epoxied / riveted to the outside of the aluminum frame, if there was another skin epoxied / riveted to the inside
> of the aluminum frame and the void between the two completely filled with spray foam insulation and it bonded to both surfaces then
> I would agree it would make the roof much stiffer.
>
> Things that make you go hmmmmmmm?
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: Larry Erd
>
> I would never remove the foam in a GMC ceiling, It adds a lot of rigidity to the
> roof, The roof will buckle a lot more when walking on it. The foam is part of the
> structure. I added 200 board feet of Tiger spray foam (non flammable) for almost
> a flush to the ribs, than glued the Mylar bubble wrap over the hole ceiling and glued
> another layer of bubble to1/4" plywood, than my foam backed headliner material.
> I have only one 15000 BTU Penguin AC, it works great here in Florida.
>
> Larry
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Ceiling Insulation [message #210407 is a reply to message #210402] |
Sat, 08 June 2013 21:00 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Rob
For the record, the Hotter Than Hades RV park in New Mexico was not
operating last winter when I was there for the 3 months. I believe it may
be a seasonal operation. Whatever season I'm there, it doesn't operate. <g>
Mike in NS
On Sat, Jun 8, 2013 at 10:44 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Dan,
>
> From where I sit there are four benefits of having two roof A/C units:
>
> 1) when you pull up to park at the Hotter than Hades RV Park, New Mexico
> you can fire them both up and the GMC will cool down MUCH
> faster.
>
> 2) If the temperature goes to 115°F in the shade at the Hotter than Hades
> RV Park you can kick on the second unit and you'll stay
> cool.
>
> 3) if one craps out on an August Sunday in Hotter than Hades, New Mexico
> your GMC does not turn into a sauna.
>
> 4) if number 3 happens you don't have to go to a local RV place and pay
> through the nose you can shop around and find a unit on
> sale.
>
> Regards,
> Rob
>
>
> -----Original Message-----
> From: Dan Gregg
>
> Larry, good to hear that you have a 15k unit that cools your GMC. We have
> one too and have never thought we needed 2. Our travels
> have taken us to some hot and humid places. My only complaint is that our
> center mounted Coleman is rather noisy. Can't imagine what
> 2 would sound like. When traveling in very hot temps I normally shut the
> bedroom door. That helps a lot.
> Every time I pull a panel I cram all the insulation I can into that spot.
>
> Dan
>
>
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--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
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| Re: [GMCnet] Ceiling Insulation [message #210412 is a reply to message #210401] |
Sat, 08 June 2013 22:34 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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MSSS,
I bought two Dometic Brisk Air 13,500 BTU units for $1158 delivered; both have the 1500 watt heat strip from Adventure RV.
They are high, noisy, (compared to JohnS's Carrier units) and the knobs which are mounted to the roof unit do not line up properly
with the inside unit.
After EmeryS helped me get the Onan running properly last summer I can run both of them at the same time. We fired up the Microwave
and used a lot of hot water to make sure that was pulling power too. Onan took it in stride, no problem.
Regards,
Rob M.
-----Original Message-----
From: Mickey Space Ship Shuttle
specials@adventurerv.net
1500 no heat ac for 559 dollars, is it better if you have one to get the 1500 or the 1350, for the onan to start it. which one to
get?
mickey
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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] Ceiling Insulation [message #210413 is a reply to message #210412] |
Sat, 08 June 2013 22:44 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Thank you, Who is JohnS's carrier units and where do i go for them, please. thank you if you have time."?
Msss
77 pb ca.
On Jun 8, 2013, at 8:34 PM, Rob Mueller wrote:
> MSSS,
>
> I bought two Dometic Brisk Air 13,500 BTU units for $1158 delivered; both have the 1500 watt heat strip from Adventure RV.
>
> They are high, noisy, (compared to JohnS's Carrier units) and the knobs which are mounted to the roof unit do not line up properly
> with the inside unit.
>
> After EmeryS helped me get the Onan running properly last summer I can run both of them at the same time. We fired up the Microwave
> and used a lot of hot water to make sure that was pulling power too. Onan took it in stride, no problem.
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: Mickey Space Ship Shuttle
>
> specials@adventurerv.net
>
> 1500 no heat ac for 559 dollars, is it better if you have one to get the 1500 or the 1350, for the onan to start it. which one to
> get?
>
> mickey
>
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> Unsubscribe or Change List Options:
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| Re: [GMCnet] Ceiling Insulation [message #210443 is a reply to message #210362] |
Sun, 09 June 2013 08:36 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Larry,
No matter what you decide to do for insulation, while the ceiling and front and rear caps are down, and if the sidewalls are exposed, now is the time to check for leaks. When our ceiling was down, we went to a Greater Midwest Classics rally with the coach. While there, it rained....HARD. Sounded like we were inside of a tin can with lots of people beating on the outside of the coach. No matter...I took a flashlight and inspected every inch of the bare ceiling and walls and marked the location of the leaks with a magic marker. I found leaks around the clearance lights, around the antenna, around the windshield, and lots of leaks around the side windows. I fixed or plugged every leak, took out the windows and resealed, and tested again with a hose. The last thing you want is to spend a lot of time and effort redoing your ceiling or walls only to have it stained again by leaks that could have been fixed while those areas are exposed. IMHO it is more than worth the time.
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Ceiling Insulation [message #210445 is a reply to message #210413] |
Sun, 09 June 2013 08:57 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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MSSS,
JohnS is my GMC Mate here in Humble, Texas. You go to the storage unit next to mine, however, he IS a Texan and you'll get shot if
you try to "get them" off the roof of his GMC! ;-)
Regards,
Rob M.
-----Original Message-----
From: Mickey Space Ship Shuttle
Thank you, Who is JohnS's carrier units and where do i go for them, please. thank you if you have time."?
Msss
77 pb ca.
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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] Ceiling Insulation [message #210446 is a reply to message #210443] |
Sun, 09 June 2013 09:07 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Larry,
At the Santa Rosa GMCMI Convention there was a gorgeous GMC restored by a Canadian couple over seven years! They had all the
insulation removed and when all the wiring and plumbing was done and they had mounted everything they wanted on the roof they had
the interior re-sprayed with foam insulation. It was the blue stuff that Mike Holmes uses on his TV show.
I've thinking about this for some time and I reckon if that foam is closed cell you would have a totally water tight GMC. I've
assumed that that the blue spray insulation would bond to the skin and the aluminum frame / skin doesn't flex enough to crack the
foam.
Regards,
Rob M.
-----Original Message-----
From: Larry
Larry,
No matter what you decide to do for insulation, while the ceiling and front and rear caps are down, and if the sidewalls are
exposed, now is the time to check for leaks. When our ceiling was down, we went to a Greater Midwest Classics rally with the coach.
While there, it rained....HARD. Sounded like we were inside of a tin can with lots of people beating on the outside of the coach. No
matter...I took a flashlight and inspected every inch of the bare ceiling and walls and marked the location of the leaks with a
magic marker. I found leaks around the clearance lights, around the antenna, around the windshield, and lots of leaks around the
side windows. I fixed or plugged every leak, took out the windows and resealed, and tested again with a hose. The last thing you
want is to spend a lot of time and effort redoing your ceiling or walls only to have it stained again by leaks that could have been
fixed while those areas are exposed. IMHO it is more than worth the time.
--
Larry
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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] Ceiling Insulation [message #210450 is a reply to message #210446] |
Sun, 09 June 2013 10:09 |
stick miller
Messages: 1036
Registered: March 2010
Location: Americus, Georgia
Karma: 0
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I just don't think the factory insulation is adequate for extremes in temperature. We just returned from a 750 mile round trip in the Florida panhandle and northeast Florida and we were miserable on the road. We were very hot, not to mention a silver dollar sized hole in the right muffler...so now I am temporarily (I hope) deaf.
I have 2 roof airs that pour out cold air and, when plugged in at a campsite will freeze us out. Our Onan continues to be undependable and once the cabin gets hot, there is no turning back. Every hour or so, the Onan fails and I have to get out of the coach, hook the Onan pump to the hot side of the starter and (I suppose) prime the pump. If it starts, it only happens again in another hour. The process starts all over.
My dash air and the auxillary unit mounted behind the driver's seat apparently need a shot of Duracool. I have a case of it just waiting for the rain to stop.
I'm going to correct the Onan problem (I hope), work on the dash air and if that doesn't make us more comfortable I think the ceiling will have to come out for a spray-in insulation.
None of the above would have been so bad if the wife hadn't been along. She was patient but not THAT patient.
Stick Miller
'78 Royale - "White Trash" - she left me for another man
'76 Eleganza - "Cousin Eddie" Sold
'84 Bluebird Wanderlodge - "Past Tents"
Americus, GA
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| Re: [GMCnet] Ceiling Insulation [message #210454 is a reply to message #210450] |
Sun, 09 June 2013 10:58 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Stick,
So the noise ended up being a good size hole in the muffler. That is even louder than the manifold leaks. If the hole is on top of the muffler, change it ASAP without driving too far. GMCer have had floor board fires in their coaches. One suggestion, if the mufflers have been on the coach a long time or you do not know when they were installed, then change both mufflers out.
JR Wright
78 Buskirk Stretch
Michigan
On Jun 9, 2013, at 11:09 AM, Stick Miller <stickmiller@gmail.com> wrote:
>
>
> I just don't think the factory insulation is adequate for extremes in temperature. We just returned from a 750 mile round trip in the Florida panhandle and northeast Florida and we were miserable on the road. We were very hot, not to mention a silver dollar sized hole in the right muffler...so now I am temporarily (I hope) deaf.
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Ceiling Insulation [message #210472 is a reply to message #210450] |
Sun, 09 June 2013 14:20 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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| Stick Miller wrote on Sun, 09 June 2013 10:09 |
...Our Onan continues to be undependable and once the cabin gets hot, there is no turning back. Every hour or so, the Onan fails and I have to get out of the coach, hook the Onan pump to the hot side of the starter and (I suppose) prime the pump. If it starts, it only happens again in another hour. The process starts all over.
...
I'm going to correct the Onan problem (I hope)...
|
I had an extended discussion with Rob M when his was being temperamental (similar, but not exactly what you are experiencing). I was adamant that it was the coil (as you probably know, when they fail slowly over time they stop working when they get hot, then they work for a while, then they stop working, and so on). Rob thought it was the fuel pump. His was acting EXACTLY like a coil problem. Rob was right, it was the fuel pump. Onan fuel pumps fail in a way like small engine coils. They get hot and stop working.
Let us know when you get it fixed, and whether it is the coil or the fuel pump.
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| Re: [GMCnet] Ceiling Insulation [message #210475 is a reply to message #210472] |
Sun, 09 June 2013 15:55 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Mark,
Here's a laugh for you!
The first sentence of your email "says:" "I had an extended discussion with Rob M when his was being temperamental. . ."
For some reason my brain saw; "I had an extended discussion with Rob M when HE was being temperamental. . ."
I typed a response noting that I know I'm a pedantic bugger but I don't think I'm temperamental!
Then I read it again, DOUH!
Made me laugh.
Regards,
Rob M.
-----Original Message-----
From: A.
I had an extended discussion with Rob M when his was being temperamental (similar, but not exactly what you are experiencing). I
was adamant that it was the coil (as you probably know, when they fail slowly over time they stop working when they get hot, then
they work for a while, then they stop working, and so on). Rob thought it was the fuel pump. His was acting EXACTLY like a coil
problem. Rob was right, it was the fuel pump. Onan fuel pumps fail in a way like small engine coils. They get hot and stop
working.
Let us know when you get it fixed, and whether it is the coil or the fuel pump.
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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] Ceiling Insulation [message #210479 is a reply to message #210475] |
Sun, 09 June 2013 16:17 |
stick miller
Messages: 1036
Registered: March 2010
Location: Americus, Georgia
Karma: 0
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I'm going to start a new thread since we're moving away from the topic.
Stick Miller
'78 Royale - "White Trash" - she left me for another man
'76 Eleganza - "Cousin Eddie" Sold
'84 Bluebird Wanderlodge - "Past Tents"
Americus, GA
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