I have some broken tile in my kitchen ceramic or porcelain and the tile is discontinued. The floor was a little spongy so I sistered some 2x6 to the existing joists not knowing the real layout of the flooring. After closer observation, I discovered that the underlayment is off the subfloor elevated by 3 inches. It is this part that is spongy. what is the best approach for me? I'm sure they did it to bring up the floor level to the dining room. Thank you
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