"Walter R." wrote in message
...

I am having a contractor tile my outdoor patio. It is partly covered and
partly subject to rain and sun (Southern California, no freezing). The
size
is 11x 40 feet. Tile size is 18" square.

The tile will be installed on a concrete slab, using thinset. Should the
contractor make some provision for heat expansion/contraction? Silicone
grout? Control joints? He says, no provision for expansion is necessary.

If you suspect your chosen contractor is
lying to you, why not consult the building
permits office? If patio tile cracking required
an expansion joint where you live, the probllem
and its economic solution would be in the building code.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)