The first step in reducing vehicle noise is controlling vibration in the sheet metal and plastic trim panels. Vibrating panels are transparent to sound passing through them. Vibrating panels also generate very audible noise.
6"x10" Sound Deadener Showdown CLD Tiles™ are optimized to control vibration when covering approximately 25% of a panel's surface. Less effort, less chance of interfering with future body work. Job done.
When I introduced CLD Tiles™ in 2009, nobody referred to products of this type as "CLD" or "CLD Tiles". Now most do.
Simple peel and stick application.
Control Vibration, Prevent Corrosion
CLD Tiles™ are the right choice for most vibration damping tasks. Where you need corrosion protection for your sheet metal - camper vans or the floors of vehicles that may be exposed to moisture, Our 12"x24" CLD Sheets are the solution.
CLD Sheets use the same advanced adhesive/vibration damping butyl compound as our CLD Tiles™. The thinner foil and adhesive layers make them less effective as vibration dampers than our CLD Tiles™ but since you will be covering 100% of he exposed sheet metal, overall performance is just as good. Our CLD Sheets equal or outperfom the best known brands on the market.
Mass Loaded Vinyl (MLV)
Mass loaded vinyl reduces noise levels more than any other material we use. It blocks sound. It weighs 1 pound per square foot, is 1/8" thick and comes on a 54" wide roll. It is limp so its natural resonant frequency is below the audible range. It can be a little tricky to work with, but we'll show you exactly ow to do it.
Barriers should not be in direct contact with any hard surface -, sheet metal or trim panel. We use 1/8" Closed Cell Foam (CCF) to decouple or separate Mass Loaded Vinyl from the vehicle.
For a full vehicle treatment you will cover 100% of the interior surface of the vehicle's outer shell below the glass - floor, doors, cargo area/trunk floor, quarter panels, pickup and roadster back walls, van walls, etc. There will need to be some breaks in coverage for the vehicle to function and go back together. You want those gaps to be as small as possible.
If you are targeting a single noise and entry point, exhaust noise through the trunk floor for example, MLV and CCF are the primary materials you will use, You want to get as close as possible to fully blocking the path of the noise you are trying to reduce.
Sound Deadener Showdown's Mass Loaded Vinyl is OEM quality, very flexible and has no offensive odor.
Hydrophobic Melamine Foam (HMF)
Absorb Sound, Reduce Heat Transfer
Melamine Foam was shockingly effective above the headliner and in the pillars.
CLD Tiles™ or CLD Sheets to control vibration and resonance in sheet metal and plastic panels, Plain or Foil Faced Mass Loaded Vinyl to block sound (with the help of Closed Cell Foam) and the final tool in our box, Hydrophobic Melamine Foam to absorb sound.
Melamine foam is a remarkable material to start with. Sound Deadener Showdown's Hydrophobic Melamine Foam has been treated to repel water. It's waterproof, won't burn, absorbs sound as well as any material out there and is an outstanding thermal insulator. We offer 24"x24" pieces, either 3/4" or 1.5" thick.
The effectiveness of any sound absorber is controlled by its thickness - the thicker the better. Hydrophobic Melamine Foam is compressible so you want to use it in protected open spaces - between the roof and headliner, inside quarter panels, inside van walls, behind trim panels, any fixed airspace.
Closed Cell Foam (CCF)
Decouple - Keep One Thing From Touching Another
Sound Deadener Showdown's 1/8" Neoprene/EPDM Closed Cell Foam has the ideal combination of properties. Like all truly closed cell foam, it is waterproof. It distinguishes itself by its near perfect combination of compressibility and resilience.
Like all other closed cell foam, ours has no acoustical value. It doesn't absorb or block sound. It is a gasket. It is the soft layer between two hard layers. If you are using Foil Faced Mass Loaded Vinyl, it creates the airspace required for a radiant barrier to function.
The final distinguishing characteristic is its compatibility with HH-66 Vinyl Contact Cement. Vinyl is tricky to bond to itself. Trickier still to bond something else to vinyl. HH-66 compatibility means you can bond Closed Cell Foam to Mass Loaded Vinyl. You will seldom need to do more than tack CCF to MLV in a few spots where the barrier layers will hang vertically, just to keep the CCF from moving around. The polymers use in Sound Deadener Showdown's Closed Cell Foam make this possible.
In addition to decoupling Mass Loaded Vinyl from the vehicle, Closed Cell Foam is what you will use to stop trim panels from rattling against sheet metal. Line the back of the panel with CCF.
Trunk / Cargo Floor Acoustic Barrier Mats
Block Sound Entering Through the Trunk or Cargo Area Floor
The easiest way to block noise coming through the trunk or cargo area floor. Sound Deadener Showdown's Trunk / Cargo Floor Acoustic Barrier Mats have a 1/4" Closed Cell Foam decoupling layer, a one pound per foot square acoustic barrier layer and a wear surface with your choice of a diamond plate or pebbled finish. Cut them to fit, lay them in place and you're done.
Our Trunk / Cargo Floor Acoustic Barrier Mats are the functional equivent of applying Closed Cell Foam and Mass Loaded Vinyl to the trunk or cargo area floor and spare tire well. If you want to maintain a stock appearance, the latter is the way to go. If you'd like to have a utilitarian surface on the floor of your trunk or cargo area, use a mat. There should be an audible improvement if you do both. That's what I did.
The surfaces on these mats are really nice. Hazel and I have had them in our vehicles for many months now. I have the diamond plate, she has the pebbled surface. I like them because they are much less slippery than carpeted trunk liners. I put my computer bag in the trunk when I leave home in the morning. It's exactly where I placed it when I get to work. After some serious abuse, both mats look great.
Attach Mass Loaded Vinyl (MLV) and Closed Cell Foam (CCF) to the Vehicle
I'm kicking myself for not ordering your Velcro. I had overnight failure on much of my "industrial strength" Velcro I bought locally. The sample you sent me did not fail and was obviously stronger.
I hate gluing anything to a vehicle's sheet metal, most especially Closed Cell Foam. It's messy. It creates complications if you ever need body work. If you have to remove it (and I have), you will destroy the material in the process.
I thought Velcro might be a solution. I bought a pack, tested them on Mass Loaded Vinyl and steel and they failed in a day, in moderate heat. I liked the idea but the pressure sensitive adhesive wasn't up to the task. I contacted Velcro. They sent me samples of a bunch of PSA options. I tested them and the one in our strips worked perfectly. We've been using and selling them ever since. The adhesive is amazing. It's considerably more expensive than the standard adhesive, but it will stick to any non-porous surface, including vinyl, with a very strong initial bond that increases in strength over time, We've never had a strip fail.
Here's how we Attach MLV and CCF to the Vehicle. In addition to solving all of the problems the glue caused, Velcro Strips make it possible, with a little planning, to remove sections of CCF and MLV, do what you need to do and replace the barrier. Using Velcro allows you to make slight adjustments in position as you fit the materials.
HH-66 Vinyl Contact Cement
Bond Mass Loaded Vinyl (MLV) to MLV and Closed Cell Foam (CCF) to MLV
HH-66 Vinyl Contact Cement makes it possible to bond Mass Loaded Vinyl to Mass Loaded Vinyl. It's critical to be able to do this. While MLV is very flexible, it only likes to bend in one direction at a time. To cover compound curves you often need to assemble smaller pieces of MLV. You don't want gaps at the seams. This is how we seal seams in MLV. HH-66 lets us do this.
HH-66 is a contact cement. It needs to be applied to both surfaces being joined. Let the cement dry until just tacky and press the pieces together. The bond will be strong enough to work with immediately and stronger than the vinyl after 24 hours. Any stray cement that ends up outside the join is not sticky at all after it cures so it won't be collecting junk and sticking to things going forward.
HH-66 also lets us attach Closed Cell Foam to Mass Loaded Vinyl. This usually only needs to be done at a few spots (1 inch circles, or so) on a piece that will be hanging vertically or might otherwise slide around.
Extruded Butyl Rope (EBR)
Create Vibration Damper, Make Air and Water Tight Seals
All of our products started with me asking: "what would I use if I had exactly what I wanted, not what was available"? Extruded Butyl Rope (EBR) is no different.
I've often wanted some loose vibration damping butyl adhesive during projects. Not a miracle product, but great for stuffing the gap between a door's side impact beam and outer skin, mounting speaker and sub plates or replacing the adhesive on a door's vapor barrier.
Marshalltown 2 inch Maple Roller
Apply CLD Tiles and Sheets
You'll want a roller for applying CLD Tiles™.and CLD Sheets. It doesn't take much pressure, but the roller will help eliminate air pockets and will stop you from sliding your hand along the aluminum edge, cutting yourself (repeatedly) and cursing the whole process.
This is a high quality tool at a very good price. Get one. Use it for this and then anything that needs a roller for the rest of your life.