I am going to be tiling our kitchen with 12" ceramics. People have told
me that they hear of a lot of tile cracking on joisted floors especially
ranch homes. My home is constructed of 2x10 16"OC all cross braced with
the longest span being 11 feet with doubled up 1/2" plywood flooring.
Half of the kitchen is over crosswalls from the furnace room and family
rooms below. The refrigerator sits directly over one of these so I'm not
concerned with the weight of the refrigerator. Should I be concerned
with cracking. When jumping I see no noticable flexing and the floor
Appriate any input.
Long as you replace the top layer of plywood with backer board or put down a
mud bed, I don't forsee any problem. As a kid, I thought 2x10 joists were
normal- astonished me when I started house shopping and saw lotsa 2x8 joists
in tract houses. Maybe that is where the 'ranch home' bit started from. Just
for giggles, you may want to add some screws through subfloor into the
joists. Yes, big tile like that would be more likely to show visible cracks
than 6 or 8 inch would, since smaller tiles usually crack loose at grout
lines. One of the regulars on here will doubtless bring up the flex formula
for the underlying joists. As well as all the usual advice about not
trapping the dishwsher, etc, if you decide not to pull out the base cabinets
to do the install.
Have fun, and try not to take it all too seriously. You can't do any
permanent damage to the house. Absolute worst case scenario is that you have
to rip it all back out and refit a conventional kitchen floor. Expensive but
Several years ago I had ceramic tile professionally installed on a
floor similar to yours. It had half inch plywood plus quarter inch
underlay and on that he put a mesh and mortar layer then the tiles.
It ended up level with the hardwood next to it (3/4" on the half inch
plywood). There hasn't even been one small crack anywhere.
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