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Old 03-20-2019, 12:09 AM   #48
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
 
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Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 21,045
Hi, Kevin.

Good timing.

i) You are correct. The tile industry specifically says to use a sealant at the change of planes and between dissimilar materials. If you need back up, ask your tiler to show you which method within the TCNA Handbook (or whichever manufacturer’s method) they are using and where it says to grout the corners. While grouting corners with cement-based grout usually only causes an aesthetic problem of an unsightly corner crack, epoxy “ups the ante” to a bigger potential problem. Because epoxy has great tensile strength, the corner may not crack if there’s differential movement between the walls. It may hang on tight enough to force a crack to the tile itself. But make no mistake on what I’m saying: just because you grout the corners doesn’t guarantee a failure. But it makes it more likely. While some pros are ok with grouting corners in a shower with cement-based grout when they build showers with strong substrate corners (like mud wall substrates), no pro will advocate epoxy grout in the same scenario.

ii) Yes, they are supposed to come out. Grout is to be filled into uniform depth joints.

iii) Needle nose pliers and gently wiggle them out. A cheap pair of pliers can be ground or belt sanded to a narrower nose, if needed.

iv) Absolutely doable by any careful amateur. We will happily talk you through the steps if you decide to part company with your pro.

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