Tile repair - Thinset under adjacent tiles sounds hollow
I'm repairing some tented tiles in my basement, I've removed all tiles that sound totally hollow. There are a few tiles around the perimeter that sound hollow only about an inch in from the area with the removed tiles, but the rest of the tile sounds super solid. Should I remove and replace these tiles also? Should I try to squeeze thinset under those tiles?
These tiles are set directly on the concrete foundation, which I know isn't ideal, but the tiles came with the house. The concrete is in good shape aside from a hairline crack running right where the tenting started. I'm planning to use sanded caulk for the perimeter of the fixed area. Thanks in advance.
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From that picture, it looks like they spot bonded the whole floor. I can't believe how clean it is under there. Doesn't seem like it was very difficult to take up more tile and just get it done now