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Unless you really like the look, big tile, polished surface stone tile is usually set using a 1/32-1/16" grout line. It is harder to get it set without showing lippage, but it often looks better. Sanded grout is usually not suggested for limestone. If you ever want the floor refinished, unless you want a matt finish, you won't be able to do it. The sand in the grout would scratch the tile, and you'd never get it polished.
The TYW store sells one brand of sealer that works quite well and helps support this site from the commissions. If you contact the people, they'll send you a small sample of the one(s) you might like to try. A good sealer is quite expensive, but you don't use that much.
Some granites do not benefit from a sealer, so do. So, you'd need to tell us what the name of the granite is.
Unless you use an epoxy grout, the grout needs to be sealed.
In the bathroom, the big tiles will work everywhere but on the shower floor...there, it is highly recommended that you use a smaller tile - less chance of slipping: more grout lines, more ridges to keep you from slipping.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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Senior Contributor
