2 4 0 T U R B O . C O M
D A V E ' S   V O L V O   P A G E
Volvo 240
Dynamat Installation

     UPDATED: January 12, 2024           CONTACT      
D  O  M  A  I  N  S
davebarton.com PrancingMoose.com 240Turbo.com
Payments and Policies
New Items
Cool Volvo Products 240 Modes & Fixes
                    Stickers Volvo
                    SteeringWheel Labels
Volvo Wire Harnesses Volvo Harness Parts, Terminals, Connectors.
Volvo Prancing Moose Stickers Other Car Stickers Volvo Conversion Harness. Volvo 960 coil harness repairs.
Volvo Underhood, Body and Chassis
                    Sticker and Labels Other Car Stickers 740, 760, 780 Turbo Boost Faces Volvo Custom Black or White Faces.
240 Black Door Vinyl Stripes. Volvo 240 Window Scrapers 740, 940 odometer repair gears and
                    instructions. Volvo 240 Odometer Repair Gears and Instructions.
Classic Auto AC Conversion Wheel Center Cap Overlays. Volvo Group A Racing Articles Prancing Moose, Volvo R-SPORT Horn Buttons, replica Alpina horn buttons 240 Hydraulic
                    Clutch Volvo Adjustable Voltage Regulators
Electric Fan Diagrams Modified 240s
                    Vacuum Diagrams
                    245 Specs Used Volvo Stuff 240 big brakes
                    apparel from Cafe Press
Prancing Moose Apparel from Cafe
                    Press Favorite Links

  If you have any suggestions to improve the information in this page, please email.  Thanks, Dave



Three different Dynamat products are used below:
Dynamat Extreme, Dynapad and Dynaliner.
I began this installation in the summer of 2017. 

Before working on the AC (see my Classic Auto Air installation HERE), I decided this would be a good time to gut the interior and cover as much as possible with sound deadening material. I had been planning this part for a while and I had bought some Dynamat a year earlier. My 242 was pretty loud inside when driving.  You didn't really notice it much until you drove a newer, much more quiet car.  It made conversation difficult and listening to a radio pretty useless. 

This was my first experience with Dynamat,
however I have used cheaper alternatives in past years.

After gutting most of the interior, I began with the firewall.

There was originally a thick Volvo factory pad on the firewall made of open cell foam with an asphalt type lining on one side. It was the same type of material as that stuff on the transmission hump in this photo. It was in sad condition, torn and falling down.  I pulled the old pad off and began by applying Dynamat Extreme all over the firewall. 

Dynamat Extreme is a peel and stick material with thick butyl rubber on one side and heavy aluminum foil sheeting on the other. 
It's very flexible, easy to cut with scissors and stays stuck, really, really well.  I've used some inexpensive alternatives before and found some of those were not very flexible and had trouble sticking or staying stuck to vertical surfaces. Dynamat does not have this problem and it conforms to any surface shape very well.

I read a LOT of reviews about many other competitor sound deadening materials before I decided to buy Dynamat.  I found that a number of competitors are using a different type of rubbery tar material that can get melt and get RUNNY in hot weather.  I have seen reviews from some unhappy customers who found puddles of oozing tar running down interior firewalls and out of the bottoms of door panels on hot days, all over their pristine interiors! 

I decided that is a nightmare I was willing to pay extra to avoid.

Then I created a new firewall pad using Dynapad. In this photo you can see Dynapad covering the passenger side firewall. It begins near the gas pedal on the driver's side and extends all the way to the right edge of the passenger side firewall. I used the old original Volvo firewall pad as a template and cut the new one with scissors. The old firewall pad was falling apart pretty bady.

Dynapad is a thick, firm foam material (just under 1/2" thick) with a butyl rubber core. 
It's fairly heavy, about 1 lb. per square foot. It does not have self-adhesive, so it needs to be held in place somehow if used on a vertical surface. As you can see in the photos, I used the bolts and wide washers that were already there on the firewall to hold the original pad.

 Here's a piece of Dynapad placed on the driver's side firewall behind the pedals.

Here I have cut new insulating pads using Dynapad for the front floors and transmission hump. Again, I used the old original pads for templates.
If you're really observant, you may have noticed the original lower heater ducts going along the hump to the floor and under the seats are missing.  Those will not be going back in with the new AC system. 

 Another view showing Dynapad covering the driver's floor.

 And the shifter hump got a new piece of Dynapad.  There was an original thick Volvo pad here too that I've replaced with Dynapad.

The outer left and right side plastic kick panels got skinned with Dynamat Extreme. This probably seems excessive, but I thought any extra amount of insulation would help wherever I could place it. 
Maybe it helped . . . probably not.


 Then I began working my way under the front seats and toward the rear seat with Dynamat Extreme.

And you can see here I added a smaller piece of Dynapad over the driveshaft hump behind the parking brake.  There was also an original piece of thick Volvo pad here that I pulled out.

The side sheet metal under the rear side panels got some Dynamat Extreme too.  I also covered the inside of the outer sheet metal as far as I could reach inside there.

Then I began putting down Dynaliner on areas under the front seats where I didn't use Dynapad.
is the foam with the black Dynaliner text printed on it below. I stopped at the front of the back seat.

Dynaliner is a smooth closed cell foam with adhesive backing.  It comes in a few thicknesses (1/8, 1/4 and 1/2 inch).
I used 1/4 inch thick Dynaliner. 

Dynaliner is advertised as a thermal barrier. 
The manufacturer doesn't really say anything about its sound deadening properties, however after watching the VIDEO BELOW of someone putting it inside a Corvette, I was convinced it would be a good addition for some degree of noise reduction.



I covered the entire floor with 1/4 inch Dynaliner foam, but I did not place any Dynaliner under or behind the rear seat, since I think that might have made things too thick to re-install the seat. The rear seat is made of thick foam, so it undoubtedly provides some sound reduction by itself.  Regarding the doors, roof and the rear package shelf, I didn't get to those at this time, so that will be something I'll work on later.

This video below was made in 2021 by someone using Noico products for sound deadening in a small Honda. What makes this video so interesting is the maker recorded sound levels and decibel readings at various stages. It gives you some really good ideas about realistic results after a lot of effort and expense.

In this video a THIRD layer is installed called MASS LOADED VINYL, which I did not install in my car.  Maybe some more studying of this third layer would be good.

So how much did my Dynamat project cost?
 Dynamat Extreme: About $150 per box. 36 square feet per box.
Everything you see in the above photos was done using TWO boxes of Dynamat Extreme.  I bought a third box for the doors and headliner, which were not done yet at time of writing this.

 Dynapad: About $90 per roll. 12 square feet per roll.  I used almost all of TWO rolls.

 Dynaliner 1/4 inch: About $50 per roll. 12 square feet per roll.  I used most of TWO rolls of 1/4 inch material.
This product is available in 1/8 inch, 1/4 inch and 1/2 inch thick.

My overall result was pretty good. 
It is not luxury car quiet, but it is noticeably better than before.

Some good links for more ideas on sound and thermal insulation:

  If you have any suggestions to improve the information in this page, please email.  Thanks, Dave


Special Emblems
Prancing Moose Stickers
Volvo Stickers
Body/Chassis/Engine Labels
New Items
Other Car Brand Stickers
Steering Wheel Labels
Center Cap Labels/Overlays
Cool Volvo Products
Grill Labels/Overlays
Volvo Wire Harnesses
Conversion Harnesses
Harness Parts/Connectors
Volvo Relays
Coil Repair Harnesses
240 Window Scrapers
740/940 Window Scrapers
Adjustable Voltage Regulators
Horn Buttons
240 Odometer Repair
740 Odometer Repair
Volvo Gauge Faces
740 Turbo/Boost Faces
240 Black Door Vinyl
850 Odometer Repair
240 Power Mirrors - Switches
240 Oil Cooler Page
240 Fuse Panel Page
Group A Racing 242 Turbo Page
240 Hydraulic Clutch Fuel Pump RELAY Page
240 Headlight RELAY Page
Used Parts & Extra Stuff for sale
240 Ignition Page
240 Headlight Page
240 Gauge Electrical Diagrams 240 REAR END Page Yoshifab Catch Can Install 240 MODS and FIXES Page
Side Marker Lights Page
Gentex Mirror Upgrade Yoshifab Drain Tube Install Modified 240 Favorites
SoCal Salvage Yards Unleaded Racing Fuel B26FT Stroker Dave's 245 Spec Page
240 SUSPENSION Page 240 Lowering Page
240 Windshield Page
240 WIPER Page
240 Big Brakes Page
240 Dash Top Gauge Pod Cadillac 4-Note Horn Install 240 DYNAMAT Installation
4 Speed Fan Controller
Electric Cooling Fan Page
BRUSHLESS Cooling Fan Page
Tropical Fan Clutches
240 AC Page "KOMFORT BLINKER" Upgrade T5 Trans Conversion Page
240 VIN Page Stepper Idle Valve Page
Vacuum Diagrams  
240 Exhaust Page 242 Power Vent Window Project EFI Volvo Pin Function Diagrams
Favorite Links
R-Sport Apparel
Prancing Moose Apparel
Volvo Meet Photo Albums Texas Volvo Meets and Events
Ordering Instructions Policies PAYMENTS Page
Mojave Road Trail Map Page
Returns Shipping Shopping Cart Troubleshooting Contact Us

Online Payments