Yes Floorguy,
But how does the vapor reach the top of the felt after the floor has been installed?
Dew point failures are associated with installing material on a floor after the interior reached dew point. Vapor condenses on a cold surface BEFORE the floor is installed, not after as you continue to debate.

Dew point failures do not occur on installed flooring as the vapor cannot go through the Laminate to the top of the cushion OR through the wood to the top of the felt.

If there is anything related to a dew point failure there must be air containing moisture to cool and condense.
How does air get between the top of a cushion and the bottom of the laminate or between the felt and the bottom of the wood after installation?

Dew point does not occur on interior buildings that maintain acclimation.

Keyword: MAINTAIN

I guess I read the original post and you didn't, or you didn't comprehend, as usual.

It isn't being "MAINTAINED" As stated clearly

Not taking anyones side here, but dew points can be reached inside in a rare situation... seen it happen with my own eyes. Water condensation on colder flat inside surfaces.

What you describe here is Condensation, not dew point.

- Condensation is warm/wet air coming into contact with cold surface.

- Dew point is warm/wet air COOLING resulting in vapor condensing into water and falling downward.

To have Dew Point failures you must have a volumn of wet air and an open floor.
Water falls downward, not upward is another little factor.
Vapor is a gas and moves upward.

In the situation on this thread, the water would, or should have, been seen by the installers during installation on top of the felt....
The acclimation AFTER installation is not a factor in Dew Point or Condensation failures as Perry Wright continues to state.

But does it matter? This thread is concerning a failure that was diagnosed to be something other than Perry Wrights "theory".

Perry, this is not the site to be debating technical issues. This is a site to aid consumers with wood flooring problems. This debate damages the site and we are here to help.
Should you wish to continue this debate on a technical level, may I suggest taking this to another site that would be more appropriate?

I thought it was clearly established that the fungus brought that water/moisture into the house and that is what caused the problem. I'm not buying the interior is so humid that it's "raining" inside the house (dew point). It just makes no sense to me.

Condensation....


The surface is below dew point. Period


- Condensation is warm/wet air coming into contact with cold surface.


resulting in vapor condensing into water


Yes, they are one in the same.


Vapors are all around us, unless you live in a vaccum, or a seal-a-meal

Taking this somewhere else sounds like a good idea to me... I'm all out of popcorn