In ,
ghw typed:
On Mon, 3 May 2010 07:08:09 -0700 (PDT), jamesgangnc
wrote:

On May 3, 8:33B am, ghw wrote:
Just had a new shower installed, tiles going down and
overlapping the flange of an acrylic shower base.
Contractor "sealed" the tile/base connection with grout,
which soon cracked due to weight in shower and
flexibility of base. I then used grouted caulk, which now
has also cracked.

How can I seal this small gap in a way that will not
crack? Or maybe I should not worry about it (concrete
backboard behind tiles).

TIA

No grout will deal with this joint. Just use regular
white caulk.

The only proble with caulk is that we live in a very moist
area and regardless of havin a very good exhaust fan,
mildew tends to grow on caulk.

It won't grow on silicon caulk; that's one of the reasons the mfr's
recommend it.