9

The concern is probably that adhesives won't bond to treated plywood, or maybe that color will leach out and stain the new flooring. You're right that you're seeing paint overspray on your subfloor. It looks like standard raw BC plywood. Single-family residential subfloors are rarely treated, in my experience. This may not be true in some high population ...


6

That looks like good old plywood decking. No obvious treatment there.


2

Professional flooring installers would flood from the high point to the low point with self level. They typically charge per bag and I've seen this kind of job cost 15k when done for more than one level of a house. You can do as you suggest a hybrid approach. Installers won't typically go that route because it is a lot more labor and requires a lot more ...


1

A not-entirely satisfactory "fix" I've used: Use a very sharp nail-set or strong awl to punch the nails well below the surface, being careful not to further damage the surface itself. Fill the divot and cracks with a cement such as epoxy, removing loose pieces or those that cannot be pushed in. Leave the patch slightly proud (above) the surface. ...


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