694 responses

  1. Emilie
    March 2, 2015

    Thanks Roger- Yes, I back buttered the tiles. I’m not sure the exact distance of support for the joists, probably somewhere around 12 feet is my guess from remembering what it looks like in the crawl space. The part that is most perplexing to me is how things have changed now that the air is less humid. I guess tile removal is in my future…thanks again.

  2. Emilie
    March 1, 2015

    Hi Roger- I’m hoping you can help me out with a rather frustrating and puzzling tile issue related to cracking grout. I installed 600 sq feet of 18 inch porcelain tile last February in my kitchen/ front hallway. About 3-4 months later I noticed the grout began to crack in high traffic areas. Over the next few months I noticed small cracks even in non traffic areas (closet) and in high traffic areas grout crumbling. You could feel the tiles move when stepping on those where the grout completely failed. Here is the info for installation. 2 layers of 5/8 tongue & groove plywood over 2×6 16 inch on center. Modified thinset with 1/4 notched trowel, ditra membrane, unmodified thinset with 1/2 notched trowel, tile, sanded grout with 1/4 inch spacing. This is my 3rd time using the ditra & I’ve never had this problem before. I’m torn about whether it not to pull up what I have access to (installed under my new caninets) and start over or just regroup & see if it cracks again. Of interesting note, now that it’s winter and the humidity is down ( we lice in virginia) the cracking has stopped and the tiles no longer move or creek when you step on them. Any ideas?

    • Roger
      March 1, 2015

      Hi Emilie,

      Do you know the unsupported span between your joists? While they may be 16 o.c. they may have a large span, lessening the deflection ratio. That may be the issue, but it sounds more likely to me that the tile itself is not bonded correctly to the ditra. Were the tiles backbuttered? The first step to determining the problem would be to pull up one or two tiles and see what type of coverage you have on the tile.

  3. Cleo
    February 24, 2015

    Hi Roger. I’m a snowbird and spend winter (Nov-Apr) in Phoenix, Arizona. I had my bathroom tiled about this time last year. Upon returning to Arizona I noticed one area where the grout has chipped out. The bathroom is only about 7 ft x 10 ft so I guess one tile isn’t bad overall. The problem is that the contractor came back the mid January and regrouted that area and now it has separated from the tile and is beginning to crack again. When the tile was installed, backerboard was put down, but I don’t remember if any thinset was put down first. As I said it’s just the one area. No other tiles have grout that is cracking or chipping out. What do you think the problem might be and what can be done to correct this? Thanks.

    • Roger
      February 24, 2015

      Hi Cleo,

      I’m thinking that the area cracking is directly over a seam in either the backer or subfloor and the backerboard seams were not taped and mudded. It could also be that there is no thinset beneath it. Either or both could cause that. The tile will need to be removed, the source of the problem identified (likely one of those) and fixed. Regrouting it will just lead to the same issue.

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