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Discuss Would you say anything? in the Canada Tile Advice area at TilersForums.com.
The right person to say something to about doing it "wrong" is the person doing the work. If they want to listen. Adding the phrase "Can you afford a reputation for dodgy work in this area?" often encourages them to think - but just confront them about the shoddy work and then walk away. If you feel strongly enough about the work (actual or proposed) being dangerous then take further action.
Telling the customer rather than the tradesman employed is (IMHO) likely to make you look underhanded.
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