| Ceiling and wall insulation? [message #200404] |
Sat, 02 March 2013 22:01  |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Moved from Shower Pan thread to get more exposure
A,
I'm not Joe, but I am looking at a 4'x8' sheet foam board product with a foil facing called R-Max, R-Matte plus 3. Available from Lowes and Home Depot in 1/2, 3/4, 1, 1 1/2 and 2 inch thickness.
1 1/2 thickness will fill the cavity between the trusses ( if you remove all the OEM stuff first) and will supply an R rating approaching R-10. This is the best R rating for the thickness I have found in various insulation products.
I have removed the oem insulation from the ceiling and hope to start installing R-Max and new headliner this week. Unless some one on the net can supply a good reason not to use this product.
The foam is POLYISOCYANURATE- probably causes cancer in rats.
Any one have any comments, questions, or suggestions?
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Ceiling and wall insulation? [message #200408 is a reply to message #200404] |
Sat, 02 March 2013 22:20  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Gene,
There has been comment here that the sheet foam needs to be securely adhered to the inside of the sheet metal or you'll "squeak on
down the road."
Regards,
Rob M.
-----Original Message-----
From: gene barrow
Moved from Shower Pan thread to get more exposure
A,
I'm not Joe, but I am looking at a 4'x8' sheet foam board product with a foil facing called R-Max, R-Matte plus 3. Available from
Lowes and Home Depot in 1/2, 3/4, 1, 1 1/2 and 2 inch thickness.
1 1/2 thickness will fill the cavity between the trusses ( if you remove all the OEM stuff first) and will supply an R rating
approaching R-10. This is the best R rating for the thickness I have found in various insulation products.
I have removed the oem insulation from the ceiling and hope to start installing R-Max and new headliner this week. Unless some one
on the net can supply a good reason not to use this product.
The foam is POLYISOCYANURATE- probably causes cancer in rats.
Any one have any comments, questions, or suggestions?
--
Gene
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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 and wall insulation? [message #200410 is a reply to message #200408] |
Sat, 02 March 2013 22:31 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Thanks Rob,
I plan to use 3m Super77 or some such adhesive to stick the panels to the structure.
Haven't installed any yet but this product doesn't seem to squeak like the white "styrofoam" type board that I started to install. That's one of the reasons I'm using the R-Max product. It also is not as "crumbbly' as the white stuff- plus the afore mentioned R rating is somewhat higher than the other readily available and reasonably priced products.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: Ceiling and wall insulation? [message #200445 is a reply to message #200404] |
Sun, 03 March 2013 09:20 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Gene,
AS 'A' suggested, I would use two layers of 3/4" material. Separate layers will provide somewhat of a thermal break between the sheets. Another thing that would be a good idea would be to seal the edges with spray foam, ie. "Great Stuff". It will expand and fill any voids between the sheets of pllyiso and the structural ribs of the body, preventing squeaks and thermal leaks. It can be trimmed even with the body ribs when dry.
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: Ceiling and wall insulation? [message #200494 is a reply to message #200404] |
Sun, 03 March 2013 14:59 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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I've been using the same stuff but three 1/2 inch layers. It follows the curves better. On the sidewalls I put 1 inch over the studs and left the spray stuff in place.
BTW, I have had great luck removing ceiling foam with a MultiMaster type tool. (The "wiggly saw".)
Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: Ceiling and wall insulation? [message #200536 is a reply to message #200494] |
Sun, 03 March 2013 23:00 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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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.
Do you still have the towbar you offered to Stil a couple of weeks ago?
I tried sending you a private message but sure you are receiving pm's.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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