Q: Most of the homes I work on are slab on grade. Occasionally I need to break a large hole in the slab for a drain or to repair a hole where some penetration such as a drain has been removed. What is the best way to repair a hole in a concrete slab before tiling over?

A: Michael Byrne, a veteran tile installer and consultant, and the moderator of JLC’s Ceramic Tile forum, replies:

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