Tips for Shower tile Install with Mastic?
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This website will give you the answers you need about using mastic vs thin set.
It can be used but not advised.//www.tiletools.com/mastic-vs-thinset-use/
There wer many instances that I and my crew used mastic in showers, around tubs, and on tub surrounds with no problems. If we were tiling a ceiling in a shower or tub area thinset will not hold to a ceiling so we used mastic for the whole job. Some customers did not have the funds to remove tub surrounds or one piece tub and showers but wanted tile. That is where we used tile mastic. Of course we couldn't guarantee the job but it worked. As long as the tile is grouted and grout sealed there should be no problem.
Your tile friend is correct. I am so so sorry. But better now than when totally complete. Is this a "remove and replace" job or a total remodel? Were permits pulled? Does not sound like it. You live and learn. Don't beat yourself up. Now you know to research thoroughly before starting your next project. This is an excellent learning experience, albeit a bit costly, but not the end of the world.
https://www.familyhandyman.com/tiling/tile-installation/how-to-tile-a-shower/view-all/
https://m.wikihow.com/Tile-a-Shower
https://www.thisoldhouse.com/ask-toh/mastic-vs-thinset
Keep us posted. Sorry to be the bearer of not so great news.
You asked your professional tile friend his advice, and it sounds like you're doing a quasi steam room shower, and I agree with your friend..... sorry its not what you wanted to hear from both of us, but you could get a 3rd professional opinion.
I have not had any problems with using mastic when needed even in wet areas through the years. Since then technology and products have changed. Your concern is warranted. A lot of sites recommend not using mastic in wet locations. Your friend would be correct to remove everything down to the studs and start over. Use cement board over the walls, seal all joints with fiberglass tape and thinset. Then use thinset to set the tiles. You can also use a waterproof membrane over the cement board before tiling. Which are newer products.
https://www.thespruce.com/tile-mastic-vs-thinset-mortar-1822590
https://www.tiletools.com/mastic-vs-thinset-use/
https://www.thisoldhouse.com/ask-toh/mastic-vs-thinset