I am in the process of installing solid wood flooring in the living room and I have just removed the existing laminate flooring and underlay to find the concrete subfloor is in great condition except for near the sliding door. I am planning to glue the hardwood flooring to the concrete and I am getting a moisture detector tomorrow to check the subfloor is not damp. The house is approx 1980s in the UK.
From the small holes in a line, it looks like there were carpet grippers and an internal wooden sill for the old sliding door before the laminate flooring. But the concrete in this internal sill area is damaged in the photos shown.
Will this be OK to continue with gluing the boards down? Perhaps if I do not glue them to this cracked only. If this cracked area is damp, can I put over a DPM just over this area plus 10cm.
I had opted in for gluing the boards down, as we have a tile hearth that is going to be level with the floor boards and I did not want excess movement between the two.
If it is recommended that this might be an issue, what would be the next best method to fix tongue and groove solid wood flooring?
In the closeup on the second picture, the grey under the cracked concrete looks like slate.