Omg,i know this is from 2010 but for anyone looking for solutions on a same problem, its not the morter ,its not the floors its not deflection either that only happens years after tile has been installed, one simple trick the durock or concrete (never ever bare subfloor or over old tile thats is absolutely lazy dirty work) where you are installing must me wet,the tile must be wet everything must be wet,when concrete and durock soak up the water its creates suction. Same if tile is wet that does the trick,thats how it works in tuck pointing as well laying cinder block for commercial walls ,fyi never morter durock ever ever never had this problem but i fixed many do it yourself projects and so called jack of all trades or handymans poor quality work,even when licensed that doesnt mean they know what they are doing,look for experience and verifiable references , cant beleive no one knows this,this separates professionals from handyman being informed before messing with someones property thats all keep everything wet with a spray bottle

Hi jpearl, did you end up going with the Karndean Loose lay tiles for your home? we are about to make a choice and are looking seriously at this option. We have dogs who are inside the house and need something that isn't going to scratch and look terrible in 12 months time. can you help? thanks so much, gayle

I just wanted to make sure we had covered every possible reason *besides* installation, so installer can't say it was structural, shrinkage as wood dried out, etc. - everything he was trying to say last year. We are always telling DD no to run in the house b/c it shakes the whole floor (and she's only 40 lb!) so was wondering if we have too much deflection. I think installer should have known that if we do (or at least figured it based on joist size/spacing), but he'd just say he put down what I asked him to - incl. the 1/4" Hardibacker that I bought so he wouldn't have to haul it here in his van (since I was buying so much stuff from HD I rented a truck to get it all home - Trex and stuff that wouldn't fit in my SUV). Even that, I asked if he wanted to put 1/4" under the Nuheat and 1/2" everywhere else (mainly to try to make up the diff. in height with 1 extra coat of thinset plus the 1/8" mat). He said no, he could level it out - NOT! My floor slopes from end of mat to edge of carpet 18" or so away. Didn't notice it with shoes on, by the time I moved in and floors were clean enough for socks it was too late to have him pull it up (ruin mat?) and redo the whole 13ft edge. Of course that's the area of the kitchen that hasn't come loose yet.

Squeegee + a microfiber towel to sop up any leftover standing puddles. The goal isn't to get it all bone dry, just absorb enough extra so the tile and grout can dry quickly on its own. Also keep the shower door open and run the exhaust fan for awhile.