Date registered: Nov 2003
Vehicle: 1988 560SEL sold:
Location: Level 42
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RE: Look how much came out!!
If you are going to regrout once again, I suggest that you might as well rip out everything including the substrate.
Regrouting is good only for cosmetic reasons and detrimental to the watertightness of shower wall. Grout, like concrete, cures from a process called hydration. Once the process is complete, it will never be reinvoked. What that means is that there is no substantial bond between the original grout and the grout that you packed in. There will not be adequate bond between the tiles and new grout either since any porous part of tiles have absorbed the original grout. Any additional attempt to scrape out the grout and repack will yield the same result. Meanwhile, daily use of shower would have pushed the water through these weak links further, eventually through sublayer (cementboard, if you are lucky) and in absence of vapor barrier (as in most cases I have encountered), it will reach all the way to framing and create all kinds of unsavoriness.
In reconstructing the wall, be sure to install the following in order from inside to out:
1. Insulation - to muffle your bodily noises (whatever they may be), and if the wall is along the foundation wall, to act as thermal insulation. Stuff between the wall frame.
2. Vapor barrier - 6 mil polyethylene sheet or a very sturdy garbage bag cut to made into a flat sheet. Staple to framing
3. Substrate - 1/2" Cementboard (I do not recommend greenboard, which is a gypsum product). I like Hardibacker.
4. Finish material - tile, or better yet, monolithic sheets of Corian. Remember, less the joints, less the chances of water making its way in.