Q: One visitor asked, "I'm planning to install 3/4" Hardwood in our living and dining room. There are some uneven spots. Is there any kind of leveling compound which will not break when nailing the strips?"

A: Depending on how severe the unevenness is in your sub floor... I generally suggest installing 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, fairly even surface to install the floor over. If the problem is severe enough, then the best thing to do is remove the sub floor where needed. Either shim or shave joists as needed and install the sub floor back in place. I still suggest putting plywood over existing pine planking as it gives a better working surface. If you decide to skip the plywood stage, absolutely, screw or spike down the existing sub floor.