If the shower pan is installed correctly, even the most unsetteled house should have no effect on the shower floor itself. It might crack around the perimeter, where the fllor joins the walls, but not in the middle of the floor. My guess would be that the mud wasn't mixed properly-- either too dry or not enough portland cement, and it's now beginning to powder, which would cause shifting under the tile, causing it to crack. One way or the other, if this shower pan is that new, I'd be getting the installer back there in a hurry, and have HIM take a look at it.

thanks! I did everything myself, the layout took me days!!!! And it's taking me months to do this.. what can I say I'm tired after working 8 hours and working on the bathroom is exhausting. and still have to install the baseboard tile, then grout then the rest. Almost there!! Anyhoooo, TILE: ⢠12x24 calacatta porcelain 12x12 same brand for the floor (ms International-also sold in tile shops but cheaper at HomeDepot) ⢠Ceramic Chair Rail and Pencil-- Jeffrey Court at home depot ⢠Mini Subway-- Merola mini subway glossy white at home depot ⢠Baseboard tile--Adex Neri baseboard from Artwalk Tile ______________________________________________ ⢠RAIN SHOWER HEAD - Riobel 12" ⢠SHOWER ARM - Jaclo 20" ⢠SLIDING HAND HELD SHOWER- Delta Faucets 57021 Multi Function Slide Bar â¢SINK FAUCET/SHOWER VALVES- Kohler Bancroft series all chrome ⢠TUB SPOUT- TOTO Vivian No diverter ______________________________________________ â¢SINK-not sure yet- Something rectangular in shape ⢠TUB- Kohler 32x60 archer drop in ⢠TOILET- Either Kohler Memoirs or TOTO Connely ⢠LIGHTING-??? not sure yet maybe this: Z-Lite 3-Light Argenta Chrome Bathroom Vanity Light ⢠VANITY- not sure yet but probably something traditional in dark brown like this. https://www.houzz.com/photos/carriage-lane-design-build-carly-nemtean-traditional-bathroom-toronto-phvw-vp~1045720-Lane-Design-Build--Carly-Nemtean-traditional-bathroom-toronto ⢠VANITY TOP- Calacatta marble ( I did a whole post about marble look tile selection a while back- this one is one of the best looking that I found - the best was a Peronda brand) This post was edited by kali2024 on Wed, Apr 23, 14 at 23:12

Julie- Can you post pics? Well, from your description - it sounds like a QUACK - especially IF it walks, talks, swims & looks like a duck.. sorry - I just HAD to throw that in there.. HA! Seriously - what you have described does sound like a crack - it's either been caused by the sudden change in temperature (thermal shock) from the hot cookie pan (which IS plausible). OR, your house is s ettling and a change in the plane of the cabinets transferred up into the stone causing the crack. OR, you are in a fault zone and tremors or seismic activity has caused a shift making the crack appear. OR, somebody DID step or sit on the stone causing the crack, and no one is "fessing up" to the dirty deed - except the two usual suspects - "Not Me" and "I Don''t Know".... we can NOT rule out a human stepping on the stone.... ANY ONE of these causes could have been responsible for the crack you now see.... The remedy is pretty simple. As far as doing anything with it - the crack will now be there forever - depending on what the cause is - it may get bigger - but it won't get smaller. IF it's something you can live with - and you can only see it, but not actually feel a break in the surface of the stone You can seal it, and keep an eye on it... AT this point - that's about all you can do since you don't have an actual break in the surface of the stone.... It it eventually DOES break the surface and you can FEEL a crack as well as SEE one - you can apply penetrating epoxy to the crack - or CA glue, and fill the crack itself - either of these can be done by your fabricator pretty easily. hth kevin

I have this stone in my bathrooms. I took close-up photos of the slabs in the stoneyard. Upon install, I noticed two of these 'cracks' in the counters and backsplash. It turns out that these were in the stone prior to fabrication--I found them in the photos when I magnified the picture! I haven't had any problems but, again, these are bathroom counters, not in the kitchen. I rejected several slabs of this stone due to major cracks that were less visible from the front of the slab but readily so from the back (I made them pull them out so I could see both sides). I was shocked that I ended up with any cracks but couldn't fault the fabricator. My fabricator hated working with this stone by the way. (The counters were installed in 2010.)