Doesn't matter how thick it is... what matters is the MASS... when using a MASS LOADING DEADENER...
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nG
Mass is part of the vibration damping equation but not all of it.
It is a good measurement for value per given incriment but not for performance.
Example:
100 sq feet of product 1 = 35 lbs
100 sq feet of Product 2 = 65 lbs
Which one gives you more product per sq foot?
The confusion started when some of the earlier internet brands would sell roofing products as vibration dampers and played on the ignorance of the unsuspecting, and trusting customer. Customers trusted that these companies knew what they were doing, and knew what they were talking about.
It was only several years later when reports of the asphaltic/bituminous roofing tapes started failing that some of the previous customers started questioning the legitimacy of the products they used and the marketing hype they used to sell these products. IF they lied to us about the quality and effectivness of the product, what else did they lie about?
By the time many people figured out that some of the internet companies were ripping people off and using inflated specs, and false marketing tactics, most of the damage had been done. The false information had already spread around the forums by way of many happy customers that saved a good deal of money on their sound deadening. These happy yet unsuspecting customers would intern promote the same false information that they were taught when they reaserched the product the first time around.
It is only once the product failed several seasons later or several days later in some cases, that they customer would go from happy, to upset and would then report their findings.
There is a learning curve for everyone that uses the wrong tool for the job, and it seems to be about 3 years with these types of materials.
Some of us have known the ins and outs of product quality and performance for quite some time, while others that are just getting in to it now, have more than enough wrong information available on the forums to fill their heads.
3 years from now, these members might start to see what many of us old timers have and will start to form opinions based on their experience while some of the lucky ones will continue to encourage people to take the same risk that they did, yet claim no responsibility when the risk does not pan out the same way the product fails.
I remember years ago, I would try to warn people on this very forum about the dangers of using asphalt mats, and I was met with fierce opposition. I was accused of bad mouthing my competitors to try and push my new butyl based product. I was accused of selling hype and fear over value and performance so that I might line my pockets with greedy money. What they failed to realize is that I once sold asphlat mats and I, more than anyone of these critics, new what I was talking about. Not only did I experience it with my own install, but in replacing clsoe to $20k worth of product for previous customers that had the same problem I had. Melting, toxic, smelly, gooey asphalt mats, oozing in our cars. It was becuase of my affiliation with the industry that my credibility was drawn in to question, instead of my affiliation adding to my credibility.
Finally I gave up, and it wasn't until Don from the
http://www.sounddeadenershowdown.com did his tests that peoples minds started to change.
I can only hope that as more time goes on, more correct info is promoted and other companies start acting like responsible members of our industry and stop selling on hype and high hopes.
This is why so many people still promote mass loading, and asphalt mats, expanding foam, ensolite, and egg crate foam even though it has all been proven time and time again to be less or non-effective (compared to real products that are desinged for cars), as well as being dangerous to use.
Someone got cheap, got lucky and all too often, got arrogant about their luck.
There will always be those lucky few that continue to promote and endorse the use of a sub par product out of pure arrogance. Rather than tought the product, whathe should be touting is his luck. Not a terrible difference in mindset between him and the guy that smoked 2 packs a day for 30 years and never got cancer.
Is it right for him to tell people with lung cancer that they got sick because they smoked their cigarettes wrong?
Too many people in the industry care not about our luck or the quality of the products they sell, and only about the bottom line.
For years they have promoted ignorance over science. Not just about asphalt either. Many have no clue what the difference between structure borne and airborne noise is.
These companies claimed that the product worked by adding mass and nothing more.
They really didn’t know the true mechanics and science behind the pseudo constraint layer dampers (roofing products) they were selling so they regurgitated whatever they heard on the internet from other companies that were spouting off the same confusing jargon.
Mass loading has nothing to do with vibration damping. Mass loading is a technique used to block the passage of airborne sound waves. Mass is king when reducing this type of noise but plays a very limited roll in constraint layer damping.
Applicable to an extent when reducing vibrations but not efficient or as effective as treating the vibrations with the right tool for the job. Constraint layer damping actually converts the vibrations on a panel in to heat.
Mass helps lower the resonant frequency but it is merely a side benefit and not in any way the main function of a true viscoelastic constrain layer damper.
So, companies rambled off at the mouth, and promoted their ignorance as scientific fact, which did nothing for the industry or the consumer.
In fact, there is still one company out there that we all know that still, to this day has absolutely no idea how their products work, and continue to claim that mass loading = vibration damping.
This same company has been mentioned at least 10 times in this thread.
ANT