What causes soft floors

Gdetrailer wrote:

Lantley wrote:
Does it matter which part of the sandwich is faulty. If it's the thickness of the plywood portion or the density of the foam either way the product loses its rigidity and creates soft spots.
Why the sandwich fails is less important than the simple fact RV manufactures are continuing to use questionable products and questionable construction methods. The consumer ends up holding the bag of soft floors!
I agree sandwich construction is generally found in "Lite" units.But I don't believe it's exclusive to light units.
The real bottom line is units that don't use sandwich construction are generally more costly which makes those units less desirable to $$$ focused consumers.

Your avoiding my question :h

Please point out the exact models and manufacturer brands which does not use a "sandwich" floor construction.

If you can't point out any models, then say so and then stop referring to that method as sandwich..

Sandwich is not the proper term for the construction of composite floor, wall or roof.

I 'm not concerned that its the proper term. This is not a grammer or construction forum. I'm using the term sandwich because its the proper description. Everyone reading this including you understand what I'm saying in terms of how the floor is constructed.
By the way I'm sure I'm not the first or last to describe the floor as a sandwich.
For the record Artic Fox states in their brochure that they use T&G plywood as their sub floor decking.
Sandwich construction is pouplar but it is not the only method being used for floor decks. But again many are not aware of the eventual soft floor issue.
Many are not familiar with other construction techniques and materials.
They simply are not aware: of the need to upgrade to something better, or gamble with the consequences of sandwich construction.

Soft spots typically don't occur instantly but they develop over time.
By the time a unit has mutiple soft areas the warranties have expired and the manufactures'are off the hook.
Leaving the unsuspecting buyer holding the soft floor bag. That tale repeats itself many times.