Why do these exist? Are they supposed to be filled in some situations? Recently I had a client’s builder say this was the reason for some extensive wall damage around the shower. The holes had been filled in this case. While I am happy he is fixing the problem for her, I kinda doubt his opinion and think there may be other undiscovered problems.
I certainly understand the function of a weephole. I question however why you would ever EVER want water or moisture of any kind behind the tile in a shower, and be content to just allow it to drain out without correcting the problem that allows it in. Around here they are generally using greenrock under tile (if you are lucky.) As far as I know that is going to soak up water, not let it drain to a weephole.
Opinions? Concensus? Should these weepholes be filled or open? Are there exceptions?