Foam in the walls? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

phlegm · 05-31-2005, 09:38 AM

Some friends and I were at a cookout yesteday talking about restoration jobs. (He has a 72 lwb). At any rate I mentioned the Acid Dipping that has been a popular thread receintly. When we talked about priming the inner metal (ie space between ceiling and roof) I asked why not just shoot foam insulation in there, it will cut noise too. Except for the wiring, which I would make sure was all brand new and working prior to shooting the foam, is there any reason not to do this? Has anyone tried it?

shortbed70 · 05-31-2005, 09:52 AM

Do you mean the expanding foam like used in house foundation? I know some of that stuff dries hard and if enough used it tends to expand and when it dries it will harden from the outside in. I would be woried about it warping the roof but it could probably be done. Just my opinion.

phlegm · 05-31-2005, 09:55 AM

Not sure about foundataions, I know some companies are using this type product for wall insulation in homes. Good point about expansion, I guess there would be no way to control that.

**CPNE** · 05-31-2005, 10:01 AM

Foam=bad. Traps moisture. Best to allow air to circulate.

chevyfarmer · 05-31-2005, 10:06 AM

My concern would be trapping moisture in the foam, and causing it to rust quicker than if it was just left alone. Here in Michigan that expando foam is used to fill rust holes on the "cheap fix" for beaters. It does work well to keep more heat in the veichle and cut the road noise down, but they rust at a incredibly fast rate once they are "foamed". As always just my .02

Sillyoldman · 05-31-2005, 11:30 AM

That foam is a neat concept,but overated. I used to be in the construction trade and seen where people got carried away with it. They use it around doors and windows. If you use too much it will actually affect the way they open and closed by pushing in the frame work causing rubbing.

greenvilledave · 05-31-2005, 11:31 AM

This idea has been around a while I worked on an mg that I did not know had this foam in some viods of the body and when i was brazing a patch piece in it, nearly
set the whole car on fire. this stuff is almost impossible to get out once it is in place
dave

67chevemall · 05-31-2005, 02:37 PM

bad idea.
$0.02

1972ChevyCheyenne · 05-31-2005, 02:50 PM

Quote:

Foam=bad. Traps moisture. Best to allow air to circulate.

Foam traps moisture. I seen a set on Grain B trains and the crossmemebers were sealed with foam. Now the only thing of the cross member that remains is the foam. Just don't do it.

Jamie

05-31-2005, 09:38 AM	#1
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Foam in the walls? Some friends and I were at a cookout yesteday talking about restoration jobs. (He has a 72 lwb). At any rate I mentioned the Acid Dipping that has been a popular thread receintly. When we talked about priming the inner metal (ie space between ceiling and roof) I asked why not just shoot foam insulation in there, it will cut noise too. Except for the wiring, which I would make sure was all brand new and working prior to shooting the foam, is there any reason not to do this? Has anyone tried it? __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was

05-31-2005, 09:52 AM	#2
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Do you mean the expanding foam like used in house foundation? I know some of that stuff dries hard and if enough used it tends to expand and when it dries it will harden from the outside in. I would be woried about it warping the roof but it could probably be done. Just my opinion. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

05-31-2005, 09:55 AM	#3
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Not sure about foundataions, I know some companies are using this type product for wall insulation in homes. Good point about expansion, I guess there would be no way to control that. __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was

05-31-2005, 10:01 AM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Foam=bad. Traps moisture. Best to allow air to circulate. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

05-31-2005, 10:06 AM	#5
chevyfarmer Registered User Join Date: Feb 2005 Location: Owosso, Mi Posts: 242	My concern would be trapping moisture in the foam, and causing it to rust quicker than if it was just left alone. Here in Michigan that expando foam is used to fill rust holes on the "cheap fix" for beaters. It does work well to keep more heat in the veichle and cut the road noise down, but they rust at a incredibly fast rate once they are "foamed". As always just my .02 __________________ 67 short wide 355ci 3 on tree 69 short wide 250ci 3 on tree 68 long wide 283 3 on tree 72 2wd Blazer project 454 5 speed

05-31-2005, 11:30 AM	#6
Sillyoldman #16876 Join Date: Apr 2005 Location: Auburn WA Posts: 12,266	That foam is a neat concept,but overated. I used to be in the construction trade and seen where people got carried away with it. They use it around doors and windows. If you use too much it will actually affect the way they open and closed by pushing in the frame work causing rubbing. __________________ Posted via Stationary Device '71 Custom Deluxe C-20 402. '67 Buick Special 455. '49 Plymouth Special Deluxe. *"I love that old car smell"* *Some people are like Slinkies... not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.*

05-31-2005, 11:31 AM	#7
greenvilledave Registered User Join Date: Oct 2004 Posts: 141	This idea has been around a while I worked on an mg that I did not know had this foam in some viods of the body and when i was brazing a patch piece in it, nearly set the whole car on fire. this stuff is almost impossible to get out once it is in place dave

05-31-2005, 02:37 PM	#8
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	bad idea. $0.02



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