Re: Conventional oak flooring vs engineered
Engineered flooring is thinner and more stable than it's full thickness counterpart. I have seen full thickness nailed down to plywood which is glued to the slab. I personally don't like this because of height issues at doors and transitions, as well as the expense and added labor to do it.
To my knowledge, engineered flooring is never glued down, it is a floating floor system. A layer of heavy plastic is laid (vapor barrier ), then a layer of foam pad for cushion and reduce that hollow "knock" that wood floors tend to have, then the floor is installed with a gap around the perimeter for expansion. Depending on the brand, you may or may not glue the tongue and grooves together.
Of the two, for a slab application, I would go with a good quality engineered floor such as Kahrs, which is what I used in my home. Kahrs has the thickest top layer so that it can be sanded and refinished a couple times. The thicker top layer also resists damage better.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!