I am prepping my basement concrete flooring to install click lock hardwood. The problem I saw is that there is a spot in the corner with this:
I am not sure what it is as it looks like a cap to cover something. BUT the problem is that area is a bit higher (like 0.5" difference with the cap).
What should I do to prep the surface for click lock floating floor installation?
Do I need to put down any underlayment?
Or should I just ignore this and it will be OK?