Black side up or down? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rabid · 06-25-2002, 03:44 PM

Just got the sound deadoning pads that have a black tar like substance on one side and white foam padding on the other. My old ones were so mangled when I took them out that I didnt notice which side went against the cab floor. Anybody know the deal with these things?

blue72stepside · 06-25-2002, 04:12 PM

The foam side was up on mine, that way from factory.

Chevy Punk · 06-25-2002, 05:43 PM

The foam was down on mine. I just ripped it out today. I found lots of new rust i didn't know about and 63 cents

71402BB · 06-25-2002, 06:03 PM

I'm almost 100% sure that it's black side down! althought I don't really think it would make much of a difference.

LOL chevypunk

snow man · 06-25-2002, 06:07 PM

just took them out yesterday the white foamy piece goes against the paint and the black will be on the top .the black should have a water proof paper and the paper side goes down.

Rabid · 06-25-2002, 06:15 PM

Well, thats two votes for foam down and two for foam up. LOL. So who is going to be the tie breaker?

snow man · 06-25-2002, 06:27 PM

white side down.take it to the bank

Stepside · 06-25-2002, 06:34 PM

I took mine out Saturday. I didn't see any white

. But the orginal cardboard backing was out. The padding was against the metal. Hope this helps.
Stepside

68 with 350 TPI · 06-25-2002, 06:35 PM

Most I have seen a have the tar side down and the foam up.

But as many I have seen the otherway as well.

The tar side was supposed to stick to the floor boards to stop the sonic resonance that the truck has from the engine running.

There are a ton of newer cars/truck that have just got the tar on the boards and then have jude padding under the carpet.

The jude acts to insulate and keep heat/cold out as well as give the carpet a softer feel .
The foam side was supposed to hold the jude material that goes just under the carpet from shifting.

They use a spray adheasive to take the place of the foam holding the jude in most newer cars
Also the tar acts kinda like a under coating to help stop rust from forming.
The foam would hold mosture if it were facing the floor and it couldent evaporate if the tar were on top ....Kinda like if you put a plastic cover over a bucket of water (if mosture ever got in there).

*Shane* · 06-25-2002, 06:53 PM

the tar is for sound deadening and vibration deadening...it goes against the floor pans

the closed cell white foam is for temperature insulation...it goes directly on top of the tar paper stuff.

carpet or rubber floor mat goes on top of this.

snow man · 06-25-2002, 07:05 PM

send me your e-mail address and i will send you pictures.would post them but don't know how.i have a 47,000 mile truck that has never been touched.

sevenwonder · 06-25-2002, 09:52 PM

white foam down on mine

blue72stepside · 06-25-2002, 10:50 PM

Ok, i will say it again i bought my truck new the black tar side is down the foam side is up. one reason is so the carpet or rubber mat does not stick to the tar. As sooner or later u will have to replace the carpet or pad. u do not have to try to pry them apart after ten years or so. Also the foam helps stop the dirt from building up in the tar, if u lift up your carpet every so often u can vacuum the dirt from the top of the pad. If u have the tar side up the dirt will be stuck to it.

snow man · 06-25-2002, 11:37 PM

maybe it depends ,all my trucks have rubber mats but all of mine have the white foam down first,and i also notice that the black tar piece has a water proof coating to keep it from sticking to the mat.

Rabid · 06-26-2002, 12:40 AM

snow man - bpogs@alaska.net is my home email.. Any pics would be great. Sounds like everybody has it different with the tar and foam deal. Maybe they put the foam down with the rubber mats and the foam up with the carpet. Who knows. I'm gonna find the right answer on this even if I have to find somebody at GM Corp to answer it.

Stano · 06-26-2002, 12:42 AM

All mine are (starting at paint)tar,foam,carpet or mat.

snow man · 06-26-2002, 10:34 AM

i have five pictures i will post and the pictures are from an original truck that has never been touched. it was a one owner with 47,000 actual miles.

snow man · 06-26-2002, 10:35 AM

1969 we just took the tar paper off the top

snow man · 06-26-2002, 10:37 AM

next pic

snow man · 06-26-2002, 10:38 AM

next pic

snow man · 06-26-2002, 10:39 AM

last pic

lukecp · 06-26-2002, 03:58 PM

Mine was tar down, but i took it out when i removed my floor mat
to see how much rust i had to deal with. The tar was pretty moist,
i kinda think it held in moisture and made my floor rust out

. When
i put new carpet in it, i will either coat the floor with POR 15, or
undercoating to protect the new sheetmetal.

diggin69 · 06-26-2002, 04:01 PM

In all the trucks I had the foam has been up tar down...... the only wone that wasnt that way had a rubber mat......

Low69CST · 06-26-2002, 04:27 PM

man, this should have been a poll! All mine have been foam up.

Chevy409 · 06-26-2002, 04:42 PM

Oh, thought you were talking about pavement

06-25-2002, 03:44 PM	#1
Rabid Registered User Join Date: May 2001 Location: Honolulu, HI Posts: 1,237	Black side up or down? Just got the sound deadoning pads that have a black tar like substance on one side and white foam padding on the other. My old ones were so mangled when I took them out that I didnt notice which side went against the cab floor. Anybody know the deal with these things?

06-25-2002, 04:12 PM	#2
blue72stepside Registered User Join Date: Aug 2001 Location: Morgan Hill, California Posts: 309	The foam side was up on mine, that way from factory. __________________ 72 Cheyenne Stepside 357/TH350 3.07 Posi 379HP@5500 412FT#@4000 96 1500 Work Truck 88 Chevy Van 3/4 97 Tahoe 8.5 Lift (Sons) 00 1500 LT 4x4 (Sons) 98 Ford Cobra (Wifes Car)

06-25-2002, 06:03 PM	#4
71402BB now thats a true COON DOG Join Date: Nov 2000 Location: Franconia, NH Posts: 1,977	I'm almost 100% sure that it's black side down! althought I don't really think it would make much of a difference. LOL chevypunk __________________ current project 67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!) 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well... 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)

06-25-2002, 06:07 PM	#5
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	tar side just took them out yesterday the white foamy piece goes against the paint and the black will be on the top .the black should have a water proof paper and the paper side goes down.

06-25-2002, 06:27 PM	#7
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	tie breaker white side down.take it to the bank

06-25-2002, 05:43 PM	#3
Chevy Punk Registered User Join Date: Apr 2002 Location: Blaine WA Posts: 455	The foam was down on mine. I just ripped it out today. I found lots of new rust i didn't know about and 63 cents

06-25-2002, 06:15 PM	#6
Rabid Registered User Join Date: May 2001 Location: Honolulu, HI Posts: 1,237	Well, thats two votes for foam down and two for foam up. LOL. So who is going to be the tie breaker?

06-25-2002, 06:34 PM	#8
Stepside Gasser Join Date: May 2000 Location: Thomasville,NC USA Posts: 456	I took mine out Saturday. I didn't see any white . But the orginal cardboard backing was out. The padding was against the metal. Hope this helps. Stepside __________________ :thud 70 sstep tubbed, Muncie, double hump, snowflake,

06-25-2002, 06:35 PM	#9
68 with 350 TPI Registered User Join Date: May 2002 Location: Wingate NC Posts: 456	Most I have seen a have the tar side down and the foam up. But as many I have seen the otherway as well. The tar side was supposed to stick to the floor boards to stop the sonic resonance that the truck has from the engine running. There are a ton of newer cars/truck that have just got the tar on the boards and then have jude padding under the carpet. The jude acts to insulate and keep heat/cold out as well as give the carpet a softer feel . The foam side was supposed to hold the jude material that goes just under the carpet from shifting. They use a spray adheasive to take the place of the foam holding the jude in most newer cars Also the tar acts kinda like a under coating to help stop rust from forming. The foam would hold mosture if it were facing the floor and it couldent evaporate if the tar were on top ....Kinda like if you put a plastic cover over a bucket of water (if mosture ever got in there). __________________ Life is good with a 6-71 supercharged 355 in a 72 camaro

06-25-2002, 06:53 PM	#10
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	the tar is for sound deadening and vibration deadening...it goes against the floor pans the closed cell white foam is for temperature insulation...it goes directly on top of the tar paper stuff. carpet or rubber floor mat goes on top of this.

06-25-2002, 07:05 PM	#11
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	rabid send me your e-mail address and i will send you pictures.would post them but don't know how.i have a 47,000 mile truck that has never been touched.

06-25-2002, 09:52 PM	#12
sevenwonder Registered User Join Date: Mar 2002 Location: Shady Spring,WV Posts: 37	white foam down on mine __________________ 70 short,step on a 72 frame.

06-25-2002, 10:50 PM	#13
blue72stepside Registered User Join Date: Aug 2001 Location: Morgan Hill, California Posts: 309	Ok, i will say it again i bought my truck new the black tar side is down the foam side is up. one reason is so the carpet or rubber mat does not stick to the tar. As sooner or later u will have to replace the carpet or pad. u do not have to try to pry them apart after ten years or so. Also the foam helps stop the dirt from building up in the tar, if u lift up your carpet every so often u can vacuum the dirt from the top of the pad. If u have the tar side up the dirt will be stuck to it. __________________ 72 Cheyenne Stepside 357/TH350 3.07 Posi 379HP@5500 412FT#@4000 96 1500 Work Truck 88 Chevy Van 3/4 97 Tahoe 8.5 Lift (Sons) 00 1500 LT 4x4 (Sons) 98 Ford Cobra (Wifes Car) Last edited by blue72stepside; 06-25-2002 at 10:55 PM.

06-25-2002, 11:37 PM	#14
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	tar paper maybe it depends ,all my trucks have rubber mats but all of mine have the white foam down first,and i also notice that the black tar piece has a water proof coating to keep it from sticking to the mat.

06-26-2002, 12:40 AM	#15
Rabid Registered User Join Date: May 2001 Location: Honolulu, HI Posts: 1,237	snow man - bpogs@alaska.net is my home email.. Any pics would be great. Sounds like everybody has it different with the tar and foam deal. Maybe they put the foam down with the rubber mats and the foam up with the carpet. Who knows. I'm gonna find the right answer on this even if I have to find somebody at GM Corp to answer it.



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06-26-2002, 12:42 AM	#16
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	All mine are (starting at paint)tar,foam,carpet or mat. __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain

06-26-2002, 10:34 AM	#17
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	black and white i have five pictures i will post and the pictures are from an original truck that has never been touched. it was a one owner with 47,000 actual miles. Attached Images

06-26-2002, 10:35 AM	#18
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	black and white 1969 we just took the tar paper off the top Attached Images

06-26-2002, 10:37 AM	#19
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	1970 next pic Attached Images

06-26-2002, 10:38 AM	#20
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	next pic next pic Attached Images

06-26-2002, 10:39 AM	#21
snow man Registered User Join Date: Mar 2002 Location: mt. zion illinois Posts: 276	last pic last pic Attached Images

06-26-2002, 03:58 PM	#22
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Mine was tar down, but i took it out when i removed my floor mat to see how much rust i had to deal with. The tar was pretty moist, i kinda think it held in moisture and made my floor rust out . When i put new carpet in it, i will either coat the floor with POR 15, or undercoating to protect the new sheetmetal. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

06-26-2002, 04:01 PM	#23
diggin69 Southern but in Ohio!!!! Join Date: Jan 2002 Location: Eaton,Oh. 45320 Posts: 467	In all the trucks I had the foam has been up tar down...... the only wone that wasnt that way had a rubber mat...... __________________ 1969 C/10 3/4 ton 4x4 longbed custom, frame made from a 79 1972 custom-10 half/ton longbed 1980 1/2 ton 4x4 all original 350/350/205 with air Eaton,Oh rebelryder@hotmail.com

06-26-2002, 04:27 PM	#24
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	man, this should have been a poll! All mine have been foam up. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

06-26-2002, 04:42 PM	#25
Chevy409 Giddy up giddy up... Join Date: Feb 2001 Location: US Posts: 483	Black side up or down? Oh, thought you were talking about pavement __________________ 72 with 69 grille and custom 73-87 stepside. BIG BLOCK 409, SM465, NP205, 3/4 axles slung under a 5" lift, 3"bodylift, 112" frame, and 35inch Pro Comp X-terrains... "BUILT NOT BOUGHT" Here's the site...

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