I assume you are saying that you have efflorescence that is dripping down the edge of the exterior tile deck.
This repair is not considered a legitimate way to waterproof a tile installation, but in theory it could work.
#GROUT FOR OUTDOOR TILES HOW TO#
Always follow the manufacturers' directions of the sealant for how to use and apply it. This type of sealant is generally a full strength silicone sealant or a urethane sealant.
Also all transition joints from floor to walls or to other materials should be filled with the sealant too. If the tile is impervious, so water can't migrate through it, you could remove all of the grout and then install a sealant foam backer rod in the joints and install an ASTM C920 sealant over it filling the grout joints. There isn't any type of sealer that you can apply over the grout to seal the grout joints. If there is a waterproof membrane under the tile assembly then maybe you can try to find the leak and then make the appropriate repairs. If there was a waterproof membrane installed when it was constructed, then it was installed incorrectly or something damaged it after it was installed. If there wasn't a waterproof membrane installed when it was constructed, then that is the cause of the problem. If the deck is leaking then it hasn't been properly waterproofed below the tile over the substrate. Treating the symptom will not remediate the cause of the problem. ANSWER ANSWER - The leaking of deck causing damages in the ceiling below is the symptom of the cause of the problem.
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