The short answer is "yes", but there are some pretty significant exceptions to note including the flatness of the underlying sub-floor and installing engineered, unfinished flooring.  

Most of our installations are in Manhattan and we're typically installing engineered floors over concrete with glue only and no mechanical fastening; there's often a rubber underlayment - typically a QT sound control mat - installed over the concrete first.  One of the most important things with these installations is that the concrete is completely flat.  It doesn't need to be level, but it needs to be flat.  The definition of a flat sub-floor is:

"The floor must be flat (not level) to with in industry standards (within 1/4 inch in 10 feet or 3/1 6inch in 6 feet). To check, we use an 8-foot-by-1 1/2-by-3 1/2-inch residential magnesium screed"

The full article from the magazine of the NWFA is here.  If the floor isn't flat within these tolerances prior to installation you'll almost definitely end up with hollow spots.

A major red flag item for us when it comes to glueing down wood flooring is when a customer asks us to glue down an engineered, unfinished wood floor.  We've tried it and haven't had a lot of success with glueing only as the floor tends not to stay down.  We've used a couple of different manufacturer's material and have found it fairly difficult to get a tight installation that's flush with the sub-floor without using some type of fasteners.  See below for a video that show why it's difficult to only glue down an engineered, unfinished wood floor.




AuthorMarc Ringel