The dude wrote in news:jIWdnaauRdI5-
:

I will be installing some pre-finished hardwood floors on the second
story bedrooms.

This will replace the existing carpet.

I was looking at the thicker solid type prefinished.

Is it just a type of tar paper over the existing plywood? Or is there
more to it.


In this particular case, the mfgrs instructions for the particular flooring
over a particular existing flooring type is what you really need to follow.
They should know their product best as well as following it will keep the
warranty valid if it's worth anything to start with.