Thank you in advance for suggestions First time home owner trying to learn the ropes! 1960 floor level (slightly above after all these years) With tile. With a hammer and chisel I was able to pull up the old tile and began to work my way through what I thought was the mastic. I could not find where the concrete and mastic separated. My question is how deep should I chisel out the concrete in order to put a layer of level concrete back in. And should I put a border to the hardwood so the concrete does not run up against it? Thank you again for sharing your experience! I hope to in the future!