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It depends on what kind of tile and what kind of adhesive it is. Adhesives(like latex) can react with portland cement products like (thin set),that cause gassing that in time will break the bond on the tile. there are mastic products that don't react with latex.

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15y ago
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14y ago

Yes you do or the new tiles may not adhere to the floor properly. After removing the glue, mop the subfloor with a TSP (tri-sodium phosphate) solution and allow to dry before putting the new tiles down.

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11y ago

You may not be able to remove it all, but you at least have to make it totally flat and smooth, or any bumps will be felt under the new carpet.

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Q: Do you need to remove all adhesive before you lay tile?
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