I read a few posts about sound proofing the trunk area of our cars
with Dynamat/Fatmat etc or using sticky foam duct/pipe insulation.
Was getting tired of yelling at the person beside me to have a
normal conversation so decided to try it myself.
I removed all the carpet and lining from the trunk area and then actually
drove the car around for a day to hear where most of the noise was coming
from. These areas I found where targeted with additional layers of Fatmat
and foam padding.

I was going to line the trunk with Dynamat (as used before) and then
found the cost was too much so I located the 1/8 foam padding at Rona
instead. Then searching thru Ebay found a place in Oakville that sells
Fatmat in bulk at a cheap price so decided to pick up 100sq/ft of it.

Now having a pile of foam padding and also a pile of Fatmat I decided
to line the trunk area with Fatmat and then put the foam padding overtop
of the Fatmat too. This was a best of both worlds in sound insulation.


Here is a photo of my 99 Z51 trunk area with all carpeting and lining removed.



Now with the Fatmat installed after 4+ hours of rolling.
If you notice the back wall I already applied the foam padding on top of the Fatmat.
I wish they did not put so much ink/logos on the material as my hands where blue!



Final photo of the Fatmat and foam padding installed overtop of it.



Final notes, I added a double coating of Fatmat over the wheel wells top and side.
I added double coatings of Fatmat on the back trunk wall area and double foam padding
as the trunk wall liner would still fit properly.

The difference from this moddification is amazing the back of the car
is dead quiet from road noise yet you can still hear the growl of the
exhaust. Now what I need to do next is the front car area under the
seats and the doors. I will save that for another weekend.

 

Nice, clean install. Good job. It's the next project for me, as soon as it stops raining here , NJ. Maybe I should have bought a boat!

 

I'll second that

 

Great job. How does the weight of FatMat compare to Dynamat Extreme? Is it heavy? Where else can I get Fat Mat, and which version is it?

 

I dont know the weight difference between the two but the Fatmat
was the 45-50 mil version and the 100sq/ft roll was about 30lbs.
I used approx 40square feet on the back of the car, the rest will go in
the front for doors and tunnel area.

 

Can you provide some ordering/pricing info on what you used? I don't know what Rona is...
Thanx...

 

I just did mine, and then I pulled off the rear wheels and dropped down the plastic liners. Found a huge cavity on both sides toward the front so I filled it full of fiberglass insulation. Much better sound level inside!

 

Did the rear of mine with Frost King about 2 years ago.
BIG difference.. still gotta stuff the wheel wells.

Even with 1 layer of Frost King, I had a few fitment issues with putting my carpet back in.

Looks like you did a MUCH cleaner install than I did!

 

When putting the carpet in the back there was no problem with fitting it under the
speaker areas or trim and the rear plate went in fine.
The only difficult part was the two rear sides liners with lights, they where a very tight fit.
I managed to move and push them into place then wiggled them around a bit to compress
the foam on the mounting points.
The three rear compartment covers just fit now as the width has been narrowed by the insulation.
You could not apply anymore then the one layer of 45-50 mil of Fatmat and one layer
of the Frostking or you would have some fitment issues.
The Fatmat is so thin at 45 mil that it would not be much more then you have already.
Using two layers of Frostking might cause people some problems.

 

Nice job there flybyu, you did an awesome job. I don't think they have Rona in the U.S. but members stateside may find that product at Home Depot instead.

 

Yes in Canada you can get the sticky sided foam at Rona as Home Depot does not have it up here.
In the US Frostking is sold at Home Depot, Lowes and Truevalue to name a few.

 

Where in Toronto did you buy the insulation?

I'm thinking about using either The B-Quiet Extreme, Ultimate or RAMMatt

http://www.b-quiet.com/compare.html

http://www.raammat.net/

Any thoughts one these ones?

P.S. Also, on the RAMMatt site, they talk about Ensolite™ MLC and to put behind the speakers to improve the sound. Did you do that (or similar) and did it improve?

P.P.S. Taking the trunk carpet out, any tricks or is it fairly simple to do? How lone to remove the rear carpet?

 

Can you tell me if it made a difference with then exhgaust sound\drone? What exhaust do you have. I need to tone down the sound of my Borla stingers.

 

Nice work. Looks very clean and tidy