For floors, "excessive" movement = ANY, in this case. Although I'm not a
tile professional, I've laid tile in two bathrooms (recently) - one
worked and one cracked (as kinda expected... g). Any movement in the
floor at all will crack the seams. IIRC from my study two years ago, the
construction spec is 1/8" flex in 8 FEET. (Glen Ashmore can probably
produce the spec off the top... G). Also, ceramic tile is heavy. In a
boat, the only place it might make sense would be (a small section)
under a solid fuel heater. In larger areas, you would need to figure out
how to retain access to the bilge.

Coutertops are much less critical because they don't bear weight.
Remember, grout lines are NOT waterproof. The underlayment is supposed
to be secured on top of a waterproof membrane when laying tile in wet
areas. Whether _your_ countertop qualifies as wet...?

Remember also that tile is very hard - elbows and cookware suffer on
contact. g

Rufus


Dan wrote:

If it's ceramic tile you are going with then first you need to see if
there
is any play in the floor. Jump up and down on the floor, if there is an
excessive
amount of movement then don't bother tileing, the grout will crack every
few
months then eventually the tile will lift, if there is very little movement