Engineered wood flooring onto Egger Protect subfloor

[SuperPav]

We've had a bit of a change of mind for the upstairs from carpet (original plan) to continuing the same engineered wood flooring as we have downstairs (14/3mm 600x600 versaille parquet panels with ~150mm borders). Downstairs these are getting glued onto concrete which is simple enough.

 

Upstairs we have 22mm Egger Protect subfloors, which I'm pretty sure won't hold nails properly so I can't secret nail the engineered wood panels - can anybody confirm a suitable glue that would work directly onto Egger Protect? 

 

Unfortunately as the stairs and a few other thresholds are already in place, overboarding with ply would be a bit of a headache height wise so I'm trying to find a solution which works with the Egger Board. If absolutely not, I could overboard with 4mm ply and alter the thresholds and top stair nosing if that's the only way that would work.

[Blooda]

Do a test piece in a place that does not matter or a couple offcut.

 

Different to your position..

We needed to fix a small stud wall to the screed.  So we did a trial with

 

Adiseal Strongest Best Grab Adhesive & Sealant

 

Sticking a foot long piece of studding to the concrete.  Had to hit it with a sledge hammer to shift it, and then the timber split longitudinally.  At that point we concluded it was good enough for the job.

 

From what I remember the egger glue for the panels is expanding polyurethane glue, like gorilla glue, so not really suitable.