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Old 04-23-2007, 12:48 AM   #17
dave on his knees
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Join Date: Mar 2004
Location: milbank, sd
Posts: 317
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Hi Here is the method in the Tile council of North America's Guide to Installation Practices. Movement Joint Design Essentials EJ171-03
Use These Details for Control, Contraction, and Isolation Joints (Ref. pg. 7).

• interior—24' to 36' in each direction.
• exterior—8' to 12' in each direction.
• interior tilework exposed to direct sunlight
or moisture—8’ to 12' in each direction.
• where tilework abuts restraining surfaces
such as perimeter walls, dissimilar floors,
curbs, columns, pipes, ceilings, and
where changes occur in backing
materials.
• all expansion, control, construction, cold,
and seismic joints in the structure should
continue through the tilework, including
such joints at vertical surfaces.
• joints through tilework directly over
structural joints must never be narrower
than the structural joint.

Show this to the tiler and your attorney.

As far as a remedy for poor work, hmmmm, I don't think you could easily get 100% of the grout out against the perimeter. If the perimeter is not grouted adding expansion joints every 15 feet might be possible in your house. However I think the floor that has tented is probably past a repair, or anything that anyone would warranty a fix for. DIY fix with limited expense. Find a like tile and replace all loose tile then caulk around them after thinset to floor. Make sure you clean grout lines of all thinset for these expansion joints. Might last until you save enough money for a proper tearout and quality install.
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