Now heres my take on advice from sales reps, take it with a grain of salt, they only want to sell and most have jack in technical knowledge. Most all sales reps have zero install experience and will sell what the boss wants them to sell regardless of the unrealistic logic that goes along with it.
he told me to use the lvt floor muffler under it to ease the stress under subfloor imperfections
I hear this alot about easing subfloor imperfections using an underlayment.
Think about this for a minute. The underlayment eases these imperfections how? By filling the lower "imperfections" in the substrate but at the same time are making the high spots just as high at the same time. You cannot fill low spots with an underlayment and keep the high spots the same as they were before. LOL
Stupid senseless sales tactics. This is what an experienced floor prep installer knows how to do with patch, grinding and SLC that no roll of underlayment can reproduce. Get my drift?
It's been my experience over the last thirty seven years that sales reps and salesmen don't understand floor prep, cannot quote the cost because again they do not understand it and have never done it and are afraid to spec the cost of it again because they do not know it and have not done it and it might loose the sale. Thats why installers always will be asked to eat floor prep. But you know installers, they don't want to eat it so they won't do it thus the cause of many flooring failures.
I hope it catches because it will help my bottom line when everyone thinks that a roll of underlayment can replace skilled floor prep.
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I edited that last post a few times. Better read it again before you post. It's complicated.
It reminds me of the Color Tile manager back in circa "87 who wanted me to replace a Mannigton Gold install that was telegraphing the old vinyl pattern without skimming it, the other guy just went over top of the old with no embossing levelor. Course he used to be a Mannington rep so he knew more than I did or what the installation requirement said.