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Toolman1

06:46AM | 07/16/05
Member Since: 11/02/04
6 lifetime posts
Bvflooring
Just finished rebuiling the shower in our master bath, ripped out all the way to the studs and put back Hardibacker cement board and 6x6 ceramic tiles. Looking for some advice on grout before I start the last step. What are the factors in choosing sanded vs. non-sanded (1/16" spacing)? Also, water-proofing is a concern. Have used a sealer on grout before, is this good enough for a shower? Are the anti-mildew additives that are mixed with the grout powder instead of water any good? Also noticed a Mapei (sp?) product - epoxy grout - at the hardware store. Any experience with this type of product. Thanks in advance for the ideas.

Tim

Tileguybob

08:28AM | 07/16/05
Member Since: 07/03/05
283 lifetime posts
With a 1/16" grout joint you will need to use unsanded, it is of a much finer consistency enabling it to pack intot he grout joint all the way.

Epoxy grouts can be difficult to work with if not experienced, but a new one made by Laticrete called SpectraLock is much more user friendly, definitely easier in the cleanup. Epoxy grouts in general are much more resistant to staining and do not allow for much water absorption.

A sealer applied over a cement based grout will help protect from water transmission but is not 100% effective.

Use a caulk in all corners and along the seams where the tile meets the shower pan. A sealer on the cement grout will be the easiest top deal with. As long as you maintain the grout and caulk so no holes develop you should be ok.

Toolman1

11:27AM | 07/17/05
Member Since: 11/02/04
6 lifetime posts
Thanks for the quick reply. Since I kinda know what I'm doing with regular grout, I think I'll go with that option and make sure to do a good job of caulking and sealing. I had some sanded grout left over from a kitchen backsplash, sounds like I need to get unsanded for the smaller joints.

Tileguybob

11:34AM | 07/17/05
Member Since: 07/03/05
283 lifetime posts
The sanded grout has a much coarser makeup and you probably would not get it in deep enough into the 1/16" joint to have it hold over time. The general rule of thumb is over 1/8" use sanded, at or under 1/8" use unsanded.
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