DIY: Sound Deadening in trunk and rear seats - 8th Generation Honda Civic Forum
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Old 02-19-2008, 07:14 PM   #1 (permalink)
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DIY: Sound Deadening in trunk and rear seats

AS WITH ALL MODS, YOU ARE DOING THIS AT YOUR OWN RISK AND I AM NOT CLAIMING RESPONSIBILITY FOR ANY DAMAGE (TO YOU, YOUR PROPERTY, OR OTHERS) THAT OCCURS DUE TO THIS!!

I did this mod in a hybrid, so it will be a little different, especially the rear seat part. The trunk part should be pretty much the same though.

Okay. Here are some pics of what I did:
I removed all of the trunk lining and the spare tire.
I covered the whole spare tire compartment in foam.

I also covered the wheel wells with one layer, then stuffed the extra space above them with more foam. I covered the space between the trunk and the rear firewall that was not being insulated by the battery. (did that on both sides, only one is pictured)

BE SURE TO LEAVE PLENTY OF ROOM FOR VENTILATION OF THE BATTERY!!!
Personally, I just made sure there was room between the battery exhaust and the flaps that let the exhaust out of the trunk. If not properly installed, it is possible that this insulation can cause your battery to heat up and have it's life lowered (and possibly void the warranty)! Be careful!


Next I took off the back seat. It is very easy to do.
1. Unscrew the 10mm bolt between the rear right (when sitting in driver seat) seat and the rear center seat. It is between the seat cushion and the seatback, where the two seatbelt buckles come out.
2. Now that you have removed the only screw holding the bottom cushion in, pull up on the front, to release two clips (each under the side passenger seats). The entire seat bottom comes out quite easily.
3. To remove the back, there are two 10mm screws on either far side of the seat back (on the bottom, parallel to the first). There is also 1 10mm screw towards the center of the seatback (parallel to the other two)
4. Now the hardest part... Once you have removed all of the screws, the seatback is ready to come out. Move all the seatbelts around the sides of the seatback, so it can come out. Lift up, with quite a bit of force. The seat should release. Pull back on the seat and it will come out.
Note: I did this by myself, but it would definetley help to have two or three people. Please be careful when doing this!!!
Please be careful not to:
1. Hurt your back trying to release the seatback.
2. Scratch yourself of the car with the sharp metal parts on the seat.
3. Mess with the battery or any IMA components while they are exposed. (they are not really exposed, but if you do have access to them w/o the seat removed)
Please remember to install the seat correctly, otherwise you are posing a danger to you and your passengers.

I forgot to take pics of this, but you can see where that the seat screws into the rear wheel wells. I covered them in foam and it greatly reduced the noise.

While you have your seat off...
Lift up the interior trim on either side of the rear seat (next to the door). (be careful not to break any clips) This will allow you to peel up the carpet and slide some foam under the rear floor. This is what size I used:

I put it under the carpet, but I just put it on top to show the size.


Everything goes back on in the reverse order you installed it. Once all the covers are on in the trunk, the only way to see the sound deadening is to lift up the spare tire cover. It is not visible/noticeable at ALL in the interior cabin. (except for the fact that it's much quieter )

For about $30, this is definitely worth it. I will post more pics if/when I get to the front of the car.
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Old 02-20-2008, 09:30 PM   #2 (permalink)
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How much did the sound deadening help? My hybrid is rather quiet compared to some of my previous cars, but silence is always welcome. Did you consider any of the Dynamat or other brand name sound deadening materials at all.
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Old 02-20-2008, 11:22 PM   #3 (permalink)
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(haha I just replied to your post at GH)
I was looking at Dynamat, but it was pretty expensive. The HCH is pretty quite as far as the engine goes, but the freeway in my area is undergoing construction, and this helps a lot. It was only $29 and the car is noticeably quieter. I noticed that I would always just turn up my radio when I went on the freeway. Try turning your radio off for a while, I was surprised at how loud it was. If you don't think it's too loud, you can always spend the $29 on something else for your car.
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Old 02-21-2008, 01:12 AM   #4 (permalink)
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Looks like we are trading posts----

What type of foam did you use and where did you get it? It looks like carpet padding, but would like to know if it is something special. Did I read that you are going to do the front of the car as well? If so, I am very interested in the outcome as well.

TDSOUP
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Old 02-21-2008, 01:13 AM   #5 (permalink)
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PS... any thoughts to put it in the doors--maybe not the foam but maybe the Dynamat or similar?
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Old 02-21-2008, 01:36 AM   #6 (permalink)
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what did you use to secure the padding to the metal?
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Old 02-22-2008, 12:24 AM   #7 (permalink)
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Some of the foam I just set on the metal (flat parts, like under the spare tire). The other parts I zip tied it to holes in the metal frame. I probably should have mentioned that part.
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Old 02-22-2008, 02:50 AM   #8 (permalink)
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looks like a good idea

I would use dynomat but that stuff is heavy -

you should try using some industrial grade aluminum foil to cover the foam, it will further dampen it, just use some foam spray mount, then maybe spray mount the foam directly onto whatever surface so it takes the shape and also dampens out any rattles too. and use some aluminum tape for the seams. I've used the foil method with neoprene foam sheets before and works great, i might do i double layerd pad.

great post! I'll be trying out your ideas with a few modifications gere and there soon, i'll post some pics soon.
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Old 02-23-2008, 08:37 PM   #9 (permalink)
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Okay. Cool. Post up some pix here when your done!
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Old 02-23-2008, 10:21 PM   #10 (permalink)
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Now thats my kind of a DIY ! cheap and effective !!! Great work !

Where did you get that foam, and whats the brand ?

Thanks giantquesadilla
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Old 02-23-2008, 10:22 PM   #11 (permalink)
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repped !!
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Old 02-23-2008, 11:04 PM   #12 (permalink)
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bump for type of foam/carpet padding, and where it is from.
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Old 02-23-2008, 11:26 PM   #13 (permalink)
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And using this foam in the trunk is for bass response and less ratteling right? Or just for more quietness?
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Old 02-26-2008, 09:25 PM   #14 (permalink)
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What kind of foam and where did get it?
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Old 02-27-2008, 10:45 PM   #15 (permalink)
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I did it just for more quietness, but it can be used to enhance your sound system.

It is just carpet padding from the home depot. Less than $30 for about 54 sq ft.
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Old 03-01-2008, 09:40 PM   #16 (permalink)
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i did the same thing to mine too. except i did the front part where the driver and passenger foot are. i completely noticed a sound deadening difference. i believe i used the exact same carpet underlay. i just never did the rear area. this is a good idea, i was thinking of using dynamat over the rear wheel wells. maybe this summer ill use dynamat, and maybe that firewall material they use. i was thinking of using that firewall material and 3M glue it to neoprene i might get a decent sound absorber to line those parts.
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Old 03-02-2008, 12:13 PM   #17 (permalink)
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How did you do the front? Did you just put it under the carpet? Was there a big difference?
THX
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Old 03-02-2008, 03:15 PM   #18 (permalink)
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Getting the carpet up is incredibly easy in our car.

At least in my coupe.

Take out both front seats and the center console and you've got it done basically. Then just pop off the panels along the edges of the carpet and it comes right up.
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Old 03-04-2008, 11:29 AM   #19 (permalink)
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Quote:
Originally Posted by lostdaytomorrow View Post
Getting the carpet up is incredibly easy in our car.

At least in my coupe.

Take out both front seats and the center console and you've got it done basically. Then just pop off the panels along the edges of the carpet and it comes right up.
Thanks. Hopefully I'll try this soon.
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Old 05-05-2008, 04:43 PM   #20 (permalink)
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I just got back from Home hardware. I bought 2 cans of 3M Spray adhesive for foam ($10 each), Two Rolls of Aluminum Tape ($5 each) and 9 square meters of Foam Carpet insulator (identical to above for $25). I also bought 5 cans of rubberized spray coating (for sound insulation and rust prevention) from Canadian Tire for $3 each (on sale hehe). I am going to Rempve all the interior, then Cover all of the Critical Areas where I want sound dampened with Carpet insulator attached with 3m adhesive, and then coat any suspicious areas or areas that are possible exposed with moisture with the rubberized coating, this includes removing all the plastics from wheel wells and coating them in 2 layers of this good suff (weather proof, does not crack = good stuff) As I do this I will talke lots of pics and make a pretty simle (lenghty DIY)

Thanks for the idea, I have been looking for ideas for a project like this.
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