FatMat Self-Adhesive Rattletrap Sound Deadener Pack w/ Install Kit (25 Sq Ft x 80 mil Thick)

(9 customer reviews)


FatMat Sound Deadener is made to absorb vibrations and noises that travel through it giving you a dramatic reduction in irritating noises in your RV, truck, skoolie, or car.

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FatMat stops nasty rattles, eliminates vibrations, and reduces road noise, engine noise and exhaust noise in your ride. Improve audio quality, enhance bass, combats vibrational distortion.

Applying FatMat Sound Deadener to quiet vibrations in your RV, truck, skoolie, or car can result in as much a 3 dB gain in sound. Patented pressure sensitive “Super-Stick” adhesive backing with heat-resistant aluminum surface.

FatMat liners are constructed from space age heat shielding material and premium acoustical sound dampening products. With proper installation dramatic noise reductions as well as tremendous bass gains can be accomplished.


  • One 18 inch wide x 16.75 feet long Roll of Self-Adhesive RattleTrap (25 Sq Ft Total) with Install Kit Consisting of Easy Instructions, Roller, Knife, and FatMat Sound Control Decal
  • 80 mil nominal thickness with Patented “Super-Stick” Adhesive
  • Sound Deadening Acoustical Insulation for automotive, trucks, homes, RV’s, and marine
  • Hear more of the sound you want! Vibrational damper: reduces distortion, boosts bass. Uses range from personal enjoyment to extreme competitions such as dB Drag Racing.
  • Pliable, easy to cut, heat-resistant aluminum coating. Keep Sound In, Noise Out – A Sound Decision!

How to Install FatMat Mat & Rattle Trap

Step 1:

Wipe off the surface that you will be applying the FatMat to with a cleaner that will not leave a residue. Be sure to get off all dirt and grease so that your FatMat bonds tightly. This step will make a big difference in how permanent your application of FatMat is. Be sure that surface is completely dry before applying FatMat.

Step 2:

If necessary cut your FatMat to the needed size and shape with a utility knife then remove the backing from your FatMat and apply to the surface that you have just cleaned.

Step 3:

Make sure that you use the roller provided, this will ensure a tight bond between the FatMat and the surface. (Your fingers cannot do the job properly!!!). By using the roller you will be able to get the FatMat to stick securely to the different contours. You may find it necessary to cut the FatMat during application so that it lays flat on the surface. It is best to not leave any air between the surface and the FatMat.

Additional information

Weight 11.43 lbs
Dimensions 20.2 × 6.4 × 5.4 in




Item Weight

11.43 pounds

Package Dimensions

20.2 x 6.4 x 5.4 inches

Country of Origin


Item model number


Manufacturer Part Number




Date First Available

July 15 2013


FatMat Sound Control Inc.

9 reviews for FatMat Self-Adhesive Rattletrap Sound Deadener Pack w/ Install Kit (25 Sq Ft x 80 mil Thick)

  1. Limpho pheko

    ToxicIt’s asphalt based. Would give off bad Tar smell come summer heat

  2. kader

    Fast shippingItem received in good condition.Good product

  3. JoeyG

    Grate productVery Happy with it but not cheap

  4. Steven Adams

    OkDeadener starter to come loose from the panels during the summer. Worked great while it was attached. But once it got hot almost all the panels came loose. Even after cleaning with alcohol before applying.

  5. Gregor H

    Worked on an E350 diesel vanIt’s surprising how well this stuff works. I used it to (help) quiet a Ford E350 diesel van, sort of a sisyphean task, and much to my surprise this did a really amazing job. I was able to get the van from 84Db down to 78Db by covering the entire floor with this. They say 20% coverage is sufficient but that just isn’t the case if you’re really trying to get something to be quiet. More is better here.

  6. Michael Hewitt

    My experience, my opinionThe more I use this product the more I like it. I have developed some opinions surrounding this product & topic and here they are, again only my opinion based on my research and limited experience.1. The FatMat is slightly more difficult to install (correctly) than the Dynamat Extreme. (the only other similar product I’ve used)2. This FatMat product is 80mil and $2.20 a sq ft, Dynamat E is .67mil and costs $4.16 a sq ft (on date of review)3. FatMat will conform and stick to about any shape but it may take more elbow grease and possibly heat. In some areas I did use a hair dryer.4. If you take your time installing and use both ends of your roller, (the wooden handle end is very useful in the tight recessed and indented areas) you will get excellent results.5. Surface contact is key and surface contact is key, did I mention the importance of surface contact?6. The foil seems thicker on the FM. Just going by feel here, not very scientific.7. Based on the product weight (not shipping weight) currently listed on MyMotorhomeLife, the FatMat weighs in at .46# per sq ft vs the Dynamat E at .36# per sq ft. This could be good or bad depending on your view.8. Personally i think the extra mass of the FatMat is a bonus. Another product used for sound deadening is actually called Mass Loaded Vinyl or MLV. Its probably right above your feet on your vehicles firewall already. I know the theory is for the dampener (fatmat) to reduce vibration and the MLV with a decoupler (commonly foam) to stop airborne sound. Ive also heard people say you dont need much coverage with the dampener and while that may be truth for stopping vibrations when installed with 100% coverage I think it does more than that. Personally I went with about 75% coverage on the inside of the doors (outer skin) and 100% coverage just under the door panel. I then spray glued felt on the backside of my thin door panels before reattaching them. On the entire floor and wheel wells I went one layer 100% coverage followed by continuous layer of luxury liner pro befor carpet. In the rear cargo area I also added 1/8″ thick MLV on top of the factory carpet pad but under the carpet.9. Lastly I need to mention I was impressed by FatMats customer service. After ordering I emailed to see if there was anyway I could ensure shipment earlier. I received a response very quickly letting me know they would ship immediately and I would have it when i needed it. Very responsive. I emailed back thanking them and they emailed me back with a “you’re welcome”. Its the small things.

  7. Mark Crandall

    What? I can’t hear the haters on this with all the blockage…. WHAT?So far so good. I installed this on my Superduty that has diesel exhaust rattle. I’m still working on installing on all the under carpet, but the rear seats seem to be better at this point. I also have to do the doors too. It takes time and be patient. Cut into smaller workable pieces and save yourself some of the headaches. I tried working a 66 x18″ strip and I knew almost immediately that was the WRONG thing to do. I should have cut that into three separate pieces and worked one at a time. I eventually got it all tucked into the groves and such, but I had to use a heat gun to really warm and make it stretchy. Work in sections and not one big piece.My caution and it only exists in my head is the fear that the item will warm this summer and melt all over like ice cream or smell like a freshly tar coated road. Here’s to my anxiety. 🙂

  8. Courtney

    I like this product better that dynamatI did my entire 2006 Silverado 2500HD crew cab with this roll. I will need another roll to finish the doors and roof. This is my second vehicle to sound deaden with the first I used to dynamat. I like this product better that dynamat. It took me about 12 hours to do just the cab. The interior on my vehicle is pretty easy to take out so if you had a car with a lot of paneling ect it can be a pain.I have not installed my audio but the volume and clarity has significantly increased even without having done the doors. I found the dynamat to be stickier and harder to work with. It also came in sheets where this comes in a roll. This allows you to use a continuous roll across the entire cab giving it a much cleaner look compared to dynamat. Last time I sound deadened I got new carpet from stock interiors dot com and got the plush carpet option plus mass backing for added $40 and that mass backing also helped as an added layer. I plan on doing the same for this truck.

  9. FPD Business

    Impressive sound mat This did even better than I had expected on my vintage VW Vanagon Westfalia. Made a huge difference in the hollow panel sound. Could hardly believe it even though I had just installed it myself. Listen to the sound on my video. My own brother even said he thought I must have been banging the panel harder on the untreated area, but it was the same. Effective.

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