I inadvertently chipped away too much mortar bed, exposing the bituthene waterproofing underlayment, while replacing a slate tile on my deck. I'm not sure whether to repair with additional thinset mortar when I lay the new tile or apply a silicone roofing sealant before the thinset.
Tile – How to repair exposed waterproofing underlayment caused when removing a slate tile on deck
tile
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Best Answer
If you have not punctured/pierced the membrane, fill it with mortar/thinset and tile away.