Floor Insulation |
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Floor Insulation |
PaulFV8 |
Mar 28 2022, 07:51 PM
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#1
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Member Group: Members Posts: 81 Joined: 2-August 20 From: Virginia, USA Member No.: 24,562 Region Association: None |
I scraped off the floor sound insulation looking for more rust. It’s not too bad. My question, what are people doing to replace it? Is there something that replicates this material? Apologies, I’m sure this is covered already somewhere but I don’t have much luck with the search tool
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sixaddict |
Mar 28 2022, 09:27 PM
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#2
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Senior Member Group: Members Posts: 801 Joined: 22-January 09 From: Panama City Beach, FL Member No.: 9,961 Region Association: South East States |
First Auto Atlanta sells a “tar” kit. While relatively simple to install you will probably get a variety of opinions as it tends to trap moisture once it comes in.
Personally have done it a couple of different ways. For me you should paint the metal before installing. The main problem is that getting the tar to adhere to “valleys” in floor pan. I am just starting the ball rolling with the where to buy it. Your final decision should incorporate others experience as most will have more expertise than I. |
mepstein |
Mar 28 2022, 09:43 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
The original tar was good for a cheap 1960’s product. I would never use it now.
Look at lizard skin. My old shop uses it on their $200-350k builds and they are very happy with the product. |
Mikey914 |
Mar 29 2022, 03:14 AM
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#4
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The rubber man Group: Members Posts: 12,669 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Upol tiltable truck bedliner works well too.
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Superhawk996 |
Mar 29 2022, 07:18 AM
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#5
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914 Guru Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
NVH treatments have come a long way. The industry still uses bake on mastic patches and/or Liquid Applied Sound Deadner (LASD) via robotics.
Constrained layer damping like Dynamat will be the most effective at reducing noise. Especially for the low frequency structural noise that will originate from the vibration of the 914 floor pan. The downside for OEM's is that constrained layer damping is heavier (negative for fuel economy) and more expensive than spot applied LASD. Constrained layer usage is strategic. Usually used were LASD isn't enough, or cannot be applied easily by robotics. Other Liquid Applied Sound Barrier (LASB) products are typically only effective for high frequency airborne noise sources. Products like Lizzard Skin, or bed liner sprays will help, but won't be as effective as constrained layer products. LASB's are lighter than constrained layer products and will offer some noise reduction for higher frequency airborne noise that would tend to reflect off a bare metal surface. LASB's won't do anything for low frequency structural borne noise. Everything in life is a trade-off. Only you can decide but there are better options than the OEM tar/mastic which was prone to holding moisture under it. Short background on NVH: https://insights.basf.com/home/article/read...nd-lasb-systems |
friethmiller |
Mar 29 2022, 01:11 PM
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#6
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Member Group: Members Posts: 476 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region |
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bkrantz |
Mar 29 2022, 08:14 PM
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#7
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914 Guru Group: Members Posts: 7,766 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains |
Dynamat over new paint.
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friethmiller |
Mar 29 2022, 08:24 PM
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#8
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Member Group: Members Posts: 476 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region |
Found a photo of the Kilmat installed. I later took the left-over Kilmat squares/pieces and installed them into the doors. And, yes.... I DID install my vinyl roof prior to painting the exterior of my car. Don't do this!! It worked out but what a PIA! (IMG:style_emoticons/default/blink.gif) Lessons learned!!
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Montreal914 |
Mar 30 2022, 08:02 AM
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#9
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Senior Member Group: Members Posts: 1,560 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
@friethmiller : For the areas where the carpet is usually bonded to the interior, how did it go on the stick on sound deadening mat (inner long areas for example)? Same as if it was metal surface?
Thanks! |
friethmiller |
Mar 30 2022, 08:10 AM
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#10
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Member Group: Members Posts: 476 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region |
@friethmiller : For the areas where the carpet is usually bonded to the interior, how did it go on the stick on sound deadening mat (inner long areas for example)? Same as if it was metal surface? Thanks! I believe I used 3M spray adhesive on both the mat and the carpet. No issues at all with adhesion. The problem I have right now is that my passenger side floor mat slides on the Kilmat since it's not glued down. I'm planning on using some carpet tape once I get in there to wire in my A/C Evaporator. It's on my short list. |
Superhawk996 |
Mar 30 2022, 08:14 AM
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#11
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914 Guru Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
(IMG:style_emoticons/default/agree.gif)
Spray glue - same as you would use to the sheet metal. Constrained layer damping is butyl on bottom with thin aluminum top layer. The butyl acts a a decoupler and mass damping absorbing energy. The top aluminum later add a constraint that helps limit the motion of the butyl increasing effectiveness vs. just a layer of raw butyl. The aluminum top layer won't come loose from the butyl. |
Flyinlow |
Apr 5 2022, 08:22 AM
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#12
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Flyinlow Group: Members Posts: 36 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada |
What is the name of the seam sealer that you used?
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mate914 |
Apr 5 2022, 10:37 AM
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#13
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Matt Group: Members Posts: 749 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States |
I also used UPOL, they are the suppliers to Wurth. That fact it can be tinted is great for custom jobs. I would still put down some Lizard skin for more sound cushion. I plan to do this with my next two builds. Orange 914/flairs and 2.2ES6 plus a 64 356 outlaw.
Matt (IMG:style_emoticons/default/flag.gif) |
Mikey914 |
Apr 5 2022, 12:56 PM
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#14
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The rubber man Group: Members Posts: 12,669 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Upol gets my business here. Even comes with it's own applicator.
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porschetub |
Apr 5 2022, 07:12 PM
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#15
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Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
(IMG:style_emoticons/default/agree.gif) Spray glue - same as you would use to the sheet metal. Constrained layer damping is butyl on bottom with thin aluminum top layer. The butyl acts a a decoupler and mass damping absorbing energy. The top aluminum later add a constraint that helps limit the motion of the butyl increasing effectiveness vs. just a layer of raw butyl. The aluminum top layer won't come loose from the butyl. Thanks for the explanation ,I used a generic butyl that I bought on a country wide auction site,happy with it because Dynamat is mental money in my country besides. Lined the floor and used 75mm wide offcuts strips inside the doors ,made a pretty good difference so was happy,also lined the backpad with under hood sound matt but @ the end of the day well worth it but the six is bloody loud really (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/aktion035.gif) . |
pek771 |
Apr 7 2022, 09:06 AM
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#16
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Member Group: Members Posts: 273 Joined: 23-November 05 From: Conover, NC Member No.: 5,175 Region Association: None |
Much like the OP, I scraped all of the 1970 sound deadener from the car (massive PITA), I primered the floor, and put down Noico 80 mil sound mats, in the doors also. I think they have butyl in them, I brushed on Second Skin Spectrum to the firewalls, and any spots I missed. I am also going to shoot everything with bedliner, both under and in the interior. That should be fairly quiet. Especially with an electric motor.
Car has zero rust, BTW. Function of sitting for 38 years on jack stands in Arizona. |
dr914@autoatlanta.com |
Apr 7 2022, 10:01 AM
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#17
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914 Guru Group: Members Posts: 7,864 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
we have the factory duplicate kit on the shelf. We at one time had these factory insulating tar new in factory original parts bags. They were dried out but still perfect templates to make new ones, so we did. Same material exact pattern, work GREAT stick heat beat and paint just like the factory did
I scraped off the floor sound insulation looking for more rust. It’s not too bad. My question, what are people doing to replace it? Is there something that replicates this material? Apologies, I’m sure this is covered already somewhere but I don’t have much luck with the search tool |
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