QUESTIONI need assistance with a query on tile tenting. we have a patio floor about 100m2 which is tiled with a 60x60 glazed rectified porcelain. The floor was tiled back in 2012 however the tiles have started to tent recently. there are no expansion joints or perimeter joints on the patio (second floor patio). however the tiles that have tented are bowed/warped on the edges and the tiles that have not tented are true with no warpage. i had two tiles tested that lifted and the water absorption is 0.05% which should rule out irreversible moisture expansion. My question is, can a porcelain tile warp/bow after installation (due to stress)? if so is it possible that if a tile can warp/bow will this cause the floors to lift?
ANSWERANSWER - All tiles have some inherent warpage from the manufacturing process and the ANSI A137.1 is the standard that states what is allowable.
Some natural stones and some quartz stones, and some concrete tiles are known to sometimes warp after the installation under various conditions, although it is not common.
Porcelain tiles are impervious so they don't have enough absorption to cause enough expansion that would result in a porcelain tile to warp. I have never seen or heard of it happening to a porcelain tile after it is installed.
Tile tenting is normally the result of lack of movement joints (expansion joints) at the perimeters and within the field of tile, along with the tile not being as well bonded as it should.