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Unread 10-25-2019, 10:52 AM   #7
Carbidetooth
Hmmmmm
 
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Join Date: Mar 2010
Location: Boise, ID
Posts: 1,547
Technically it is a change of plane. In practice, though, I'm not sure anyone here would caulk them. I would grout and not have a worry.

I've seen those AO tiles or similar done with both sanded and unsanded. If using the lugs as spacers, I almost always recommend unsanded. I just think it looks better, but that might because of all the old installations I've seen.

In general: silicone in vertical back to end joints and tub to tile joints. Anything intersecting painted surface acrylic caulk. I'm outside norm a little in that I grout transitions from tile to painted surface in many cases, as long as they're not huge.
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Peter

Silicone (not silicon) Sealant Ranger
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