![]() ![]() You asked why the problem would be confined to the relatively narrow hallway as compared to the much larger remainder of the installation. The weak link is of course the taped edges, and the stresses are manifested there first.įrom what you have already detailed, it sounds like there could be several issues that could be the cause of the problem. The reasoning is if something is not installed properly in the entire system, then because Hardi is so stiff and rigid that rather than flexing a bit to absorb the stress, the individual panels end up acting like individual 3' x 5' "islands" of tile rather than a continuous plane of substrate. I was told that Hardi has these problems more than other brands of backer board because of the relatively high values that Hardi has for stiffness, compressive strength, etc. The only thing I remember is that after laying and screwing down the backer, he went back over it right away and taped and filled the joint. The installer had a helper working in the area in question. I tried tapping with the back of a screwdriver in many different area. And as, I remember, when backer installed it was also tight to the wall.Ģ. Was it walked on a lot in the first 24 hours?ġ. You said in your first post that the backer was layed and sat for a few days prior to the tile installation. Tap around the area and see if there is a difference in that way things sound and report back. What is the sound when you tap the tile with a solid object? Hallow or solid. Is there room for expansion? How about the tile, are they layed tight to the wall and if there is a space between the tile and wall was it left open or is it filled with grout? JTG wrote: Pull your base board and look to see if you can tell if the backer board is layed tight agains the wall. If cracks because joints too tight, can repair be made by saw cutting, then re-taped and set new stone or does the whole sheet of backer need to be pulled and replaced? If problem was structural wouldn't crack appear at other places than just over backer board joints? Rest of floor apx 800 Sqft okīut others tell me the Hardibacker was installed to tight or that modified thinset mortar should have been used (or had admix added) or combination of both. Problem mainly confined to a 6' wide hall area. Backer joint were taped and filled at time backer installed and then dried 3-4 day before Travertine laid. Same mortar used to cement Travertine to Hardibacker. Cemented using Durabond D-5 mortar without any ad-mix added. Hardibacker installed, with 1 1/2" screws at recommended schedule. Joist 2x10 on 16” 8’ span over grade beam. Sub floor is ¾” strudiboard ply sub-floor, with 2 layers added of 25/32” OSB, screwed & glued. Cracks are over the Hardibacker seams only, on a 3'x5' pattern. Hairline cracking in 18" Travertine on 3 month old floor. ![]()
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