Vapor barrier on the inner door? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chewed 71'er · 01-16-2003, 05:06 AM

What type, if any, vapor barrier originally came on these trucks on the inner doors? Mine is missing entirely (or never was there). By chance, does anyone have pictures?

**GMCPaul** · 01-16-2003, 05:46 AM

Those that we still find having anything have a brown adhesive kraft paper on them.
Sorry no pics of it but its just like the kraft paper vapor barrier found on most vehicles.
GMCPaul

BobbyK · 01-16-2003, 05:48 AM

Don't know if they came with any.I know my 71 Blazer has a foam strip that goes aroung the parameter of the door panel and that's about it.

JimKshortstep4x4 · 01-16-2003, 09:19 AM

Most of the time the vapor barriers are missing, but they should be there.

We make ours out of the backing paper used on fiber glass insulation. It is close to the original paper used on the trucks and cars. We use masking tape to hold it in place, but you could use body putty.

Jim

Fred T · 01-16-2003, 01:18 PM

They originally came with asphalt-backed kraft paper. My newer GM cars came with clear plastic sheet held on with tape. I don't know what kind of tape it is, I have been using aluminum duct tape.

chewed 71'er · 01-17-2003, 02:53 AM

I imagine with moisture and age, the paper deteriorated long ago. Thank you for the information.

PanelDeland · 01-17-2003, 10:02 PM

I used a cloth reinforced rubber.The material was used to make hydralic seals.They used a steam heated press with a couple hundred tons to form it.I got some of it in the sheet form and cut new ones from it.It quitened down the interior noise and then I used a peice of thin foam that is used to wrap items for shipping and glued it to the inside of the door panel(metal on my 68).I have way less tinny noise now and no drafts thru the new eustachions.

casey · 01-17-2003, 11:59 PM

you can use building tar paper and black duct tape, I used plastic poly and 1/2" foam behind the door panel on mine to keep out moisture and get alittle sound barrier, theses trucks need all the acoustic's they can get

01-16-2003, 05:06 AM	#1
chewed 71'er Registered User Join Date: Mar 2002 Location: KC, NW Missouri Posts: 144	Vapor barrier on the inner door? What type, if any, vapor barrier originally came on these trucks on the inner doors? Mine is missing entirely (or never was there). By chance, does anyone have pictures?

01-16-2003, 05:46 AM	#2
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,718	Those that we still find having anything have a brown adhesive kraft paper on them. Sorry no pics of it but its just like the kraft paper vapor barrier found on most vehicles. GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

01-16-2003, 05:48 AM	#3
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	Don't know if they came with any.I know my 71 Blazer has a foam strip that goes aroung the parameter of the door panel and that's about it. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

01-16-2003, 01:18 PM	#5
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	They originally came with asphalt-backed kraft paper. My newer GM cars came with clear plastic sheet held on with tape. I don't know what kind of tape it is, I have been using aluminum duct tape. __________________ Fred There is no such thing as too much cam...just not enough engine.

01-17-2003, 10:02 PM	#7
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	I used a cloth reinforced rubber.The material was used to make hydralic seals.They used a steam heated press with a couple hundred tons to form it.I got some of it in the sheet form and cut new ones from it.It quitened down the interior noise and then I used a peice of thin foam that is used to wrap items for shipping and glued it to the inside of the door panel(metal on my 68).I have way less tinny noise now and no drafts thru the new eustachions. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

01-16-2003, 09:19 AM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Most of the time the vapor barriers are missing, but they should be there. We make ours out of the backing paper used on fiber glass insulation. It is close to the original paper used on the trucks and cars. We use masking tape to hold it in place, but you could use body putty. Jim

01-17-2003, 02:53 AM	#6
chewed 71'er Registered User Join Date: Mar 2002 Location: KC, NW Missouri Posts: 144	I imagine with moisture and age, the paper deteriorated long ago. Thank you for the information.

01-17-2003, 11:59 PM	#8
casey Registered User Join Date: Jan 2003 Location: Kelowna B.C. Canada Posts: 2,048	you can use building tar paper and black duct tape, I used plastic poly and 1/2" foam behind the door panel on mine to keep out moisture and get alittle sound barrier, theses trucks need all the acoustic's they can get



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