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[quote=Anonymous][quote=Anonymous][quote=Anonymous]We are getting estimates to renovate our bathrooms, and every contractor we have spoken to (who all came highly recommended on Checkbook) has said that they use grout at changes of planes. This runs contrary to everything I have ever heard/read/experienced; my understanding is that because grout isn't flexible, it is bound to crack in this application. Am I going crazy? If just one contractor would say this I would assume that they are cheap/lazy but everyone I've talked to has said the same thing.[/quote]

So what I have learned is that silicon prevents the “dripping” of water down at the base of showers and bathtubs so that the hardy board in the back absorbs the water.

We have had a couple of our showers destroyed by this practice already. 
[/quote]
The hardy board should NEVER be in contact with the water. The water will not damage the hardy board, but hardy board will absorb water and transfer moisture to space behind it, which is usually the wood studs. This will cause moisture build-up between the walls and eventually rot out the studs. There should be a complete waterproof layer between the tile and the hardy board. There are many ways to do this, but none of them involve caulk or grout. They are removed from the equation when it comes to waterproofing.[/quote]

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