There are some uneven spots in my sub-floor. Is there any kind of levelling compound which will not break when nailing the strips?
Depending on how severe the unevenness is in your sub-floor, it is suggested that you install 3/8″ spruce plywood over existing pine sub-floors, screwed to the joists. While this will not totally correct the unevenness problem, it gives you a smooth surface to install the floor over. If the problem is severe enough, then the best thing to do is to remove the sub-floor where needed. Either shim or shave joists as needed and install the sub-floor back in place. It is still a good idea to install new plywood over the existing planking as it gives a better working surface.
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