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Old 08-20-2012, 04:07 PM   #1
Jacob76
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Default Deadening the roof

I undertook this today at lunch. It was pretty easy pulling the headliner down. I didn't even have to pull it out, just drop it.

I got 11 CLD tiles from SoundDeadenerShowdown and 20 ft^2 of 3M Thinsulate Acoustic. The tiles went on really fast. They're thicker than Dynamat Xtreme. I've got some trimming to do but should be able to finish up right after work. Need to trim away excess Thinsulate from the edges where all the clips and screws are for the visors and oh-**** handles.

When I knock on the roof, it sounds like my doors do now instead of a steel drum. Will have to see how sounds inside when I get out on the road. When I did my doors and under the back seat with dampener, CCF and MLV, I couldn't really tell a difference. But my wife says she can't tell I'm in the car anymore when she calls.

It was a real bitch getting the oh-**** handles bolted back up. Hopefully I can trim enough around the front so the same doesn't happen. It seems like the driver side b-pillar cover is going to be hard too.

Some quotes I've seen from people that did this 3M stuff before mention "fortress of solitude." Can't wait!
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Old 08-20-2012, 10:33 PM   #2
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This was tough. Spent two hours after work trying to get the visors installed again. The screws don't want to catch the threads on the speed nuts after adding a layer under there. I even trimmed well short of everything that has to fast.

Eventually I got it but my shoulders are killing me from pushing up as hard as I can for as long as I can. The back needs to be trimmed a little. I can tell a couple spots to the sides of the CHMSL are bulging with the extra padding. I'd say if you try this, trim up to the plastic blocks on top of the headliner. You'll see what I mean.

I need to take down the passenger visor when I get some more motivation. I tore the insulation off the wire running to the vanity mirror lights. It sparked a couple times so I unplugged it for now. Just have to wrap that up again.

Those visors are a PITA. Makes me never want to attempt again. I don't know what was worse; the hinged side or the clip side. Results are great. It's quieter inside. Almost tomb-like. And I can't hear rain at all on the roof anymore. Only the windows.
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Old 11-20-2012, 02:37 PM   #3
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No pics of any of this huh?
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Old 11-20-2012, 04:13 PM   #4
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No I was kind of in a hurry. Did it all before work, on my lunch break and after work. What would you like to know?
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Old 11-20-2012, 07:45 PM   #5
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So what's the diff in sound?

Any tips on removing the headliner? I've got a rattle back in the sunroof area over bumps I want to look at.
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Old 11-21-2012, 10:18 AM   #6
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It's quieter inside. Everything on the outside seems more muffled. Trucks right next to the car don't sound that much different. But airplanes overhead and outside sounds in general are quieter now. My wife can't tell when she calls me in the car if I'm in the car or still sitting at my desk.

The huge difference in sound is when it rains. I only hear rain on the windows now. I thought I would still hear rain through the roof but that it'd be damped. I hear nothing though. No more of that pinging, huge resonant sheet metal sound. It sounds like a good speaker box when you rap your knuckles on it now. Dead. Solid. You'll see on the top of the headliner are lots of plastic cubes that look like they contact the roof. This probably transmits a lot of noise. Some of the noise reduction may come from isolating these plastic bits from the roof with the 3M material.

For removing the headliner, I popped the a-pillar trim panels off. They're tethered to the car but you can remove them by twisting the plastic cable. Then I removed the b-pillars. You have to remove the lower portion first by popping off with a trim panel remover or something similar. The top portion then unscrews and drops down. The c-pillars/sail panels are held on by one screw each behind that access panel that says "airbag."

Then take the assist handles off the rear sides. Just two screws each. The visors are held up by a screw on the side that swivels. Remove that and unplug the wire that powers the vanity lights. The clip is held on buy a sliding peg type of thing. If you look at the front, there's a groove you can get a pocket knife or small screwdriver tip into. Slide that peg out towards the windshield and the clip drops.

At this point the only things holding the headliner up are two sets of clips on either side of the rear view mirror and back by the third brake light. I pulled hard on one side then the other and it came down pretty easily. Be careful at the back because it's pretty easy to break the clip that holds the third brake light's wire to the light. Mine goes back in, but it's not secure and comes out sometimes. Have to figure out how to secure the wire so it stays plugged in.

Applying the tiles from Sound Deadener Showdown was easy. They're precut to 6"x10" and they seem more substantial than Dynamat Xtreme. I used 11 tiles to deaden the whole roof. Just spread them out and use a wooden wheel to mash them down. I tried to keep the distribution pretty symmetrical side to side. Rap the outside of the roof with your knuckles to see where may need more coverage. 25% coverage was fine for me.

The 3M stuff I cut in half so I would up with two sections that span the roof from side to side. It worked out that one section did from the front of the roof back to the b-pillar and the other section did from the b-pillar to the back of the roof. I had to trim quite a bit of the 3M so the sides, front and back of the headliner would fit back up. Probably 4-5" off the perimeter. Cutting and tearing this Thinsulate puts a lot of little cotton-like fibers all over.

The real pain came with getting the headliner secured back up. It's just because there's fluffy blanket now between the headliner and roof. It's a lot tighter. I started with the assist handles in the back. I tried to push the clips by the 3rd brake light in first, but they couldn't hold the weight of the whole headliner plus the 3M blanket. Take your time and maybe trim around the pieces that have to be screwed in, like the assist handles and the visors.

Worst part was getting the visors back up. Very tight and I cut the insulation on the vanity mirror wire on the passenger side trying to put it back up through the metal. I left it unplugged then fixed later on. The clips that hold the side of the visors that swings out were hard. Take them apart so you can see how they work. The little square peg slides out and there's a spring with a plastic piece under it. That plastic piece is the round part you see on the outside of the clip that holds the visor secure. There's a small square section of the roof that protrudes into this assembly and the spring actually grips a little hole cut in that square. You have to push the clip up against that square section as hard as you can. The square peg then slides in and it has to go on top of the sheet metal square. There's a notch in the back of the clip (relative to the car) that this peg has to sit in when you push it in. I didn't take any pictures of this assembly and I'm not taking it apart again to take any. I wound up having to enlarge the hole through the headliner to get this to work but you can't tell. It sucks because I thought I got it in right but then the peg hadn't seated flat against the sheet metal and the little spring loaded retainer that holds the visor in wasn't secure. So you'd push up against it and there's no resistance on the spring. Start over. I attempted it probably 100 times before I finally got it locked down.
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Old 11-21-2012, 10:43 AM   #7
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Interesting mod. Were you interested in sound reduction to aid in audio mods, or general road and when noise reduction?
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Old 11-21-2012, 11:05 AM   #8
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All of the above. I've upgraded my speakers already. I've got a sub picked out and I'm just in the process of choosing an amp. My doors are deadended and have MLV and CCF under the inner trim panel. My trunk floor, lid, and rear quarter panels are deadened. And I deadened under and behind the back seat and the rear deck, then laid down CCF and MLV over all of that. The only thing I haven't touched is the floor. Hopefully the deadening I've done will keep the panels from rattling. It's only a single 12 though so I should be ok.

Everything was so quiet from the stuff I'd already done that I noticed the noise coming in through the roof more than before. This was the next step. We take my car on road trips to my parents and we've got a couple young girls. So it's nice not having the rain noise when they're trying to nap in the back seat.
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Old 11-21-2012, 11:10 AM   #9
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I find my car so loud its difficult to have a conversation with my passengers. Where did you see the greatest decrease in noise, what was your best bang for the buck?
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Old 11-21-2012, 12:08 PM   #10
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Hard to say. The roof was immediately noticeable as it rained the day I finished it. The doors I did one by one as I had time. So the difference there wasn't night and day for me. Putting the CCF and MLV behind and under the back seat made a big difference. I couldn't hear things moving around in the trunk anymore. It's important to have as much unbroken coverage as you can with that CCF and MLV though. I cut out a hole for the pass-through and I can hear stuff in the trunk again.
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Old 11-21-2012, 01:13 PM   #11
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Some pics of exposed areas here: Should be the same

http://www.g8board.com/forums/showth...758&highlight=
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Old 11-21-2012, 07:50 PM   #12
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Well done on that long reply Jacob - much thanks!
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Old 11-23-2012, 04:57 PM   #13
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Quote:
Originally Posted by quitplayn View Post
I find my car so loud its difficult to have a conversation with my passengers. Where did you see the greatest decrease in noise, what was your best bang for the buck?
Loud in what way? My car is completely quiet. I can mute the stereo and have a perfect conversation with everyone in the car even going highway speeds. The only annoying noise I get is the little rattle in the back on certain songs when my stereo is very loud.
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Old 05-01-2013, 01:04 PM   #14
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Quote:
Originally Posted by nuke21 View Post
Loud in what way? My car is completely quiet. I can mute the stereo and have a perfect conversation with everyone in the car even going highway speeds. The only annoying noise I get is the little rattle in the back on certain songs when my stereo is very loud.
A little late to reply but..my car was to loud for my taste from the beginning many conversations with GM service representatives gained me nothing. If I still had a decible meter I would use it and report. It's loud enough for my wife to have noticed, its louder than my old G6, and much louder than all the foriegn cars I owned previously, BMW M6, Saab 95 Aero, Porsche 944s.
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Old 05-01-2013, 03:28 PM   #15
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to quitplayn, have you ever had (or has) the windshield replaced? It the windshield is OEM, it'll have the name "Saint Gobain Sekurit". You will see what looks like the symbol of an ear (thats right, an EAR) on the lower passenger's side corner.

If your windshield does not say the above then it is not OEM and is the reason your car is so loud.

To the OP, thanx for the write-up and idea.
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