Tile Overlap in Shower


The patient is a shower stall, acrylic base, cement backer board, 8x10 tiles in thinset. The tiles overlap the lip of the acrylic base by 1/2"(?) and there is a 1/4" gap between the bottom row of tiles and the flat top of the base. I went to start grouting, and noticed that the gap behind the bottom of the tiles isn't always filled with thinset.
Is it necessary/desirable to try to push thinset/grout under the bottom tiles and into the gap behind? Should I just squeeze extra caulk up into the gap? Caulk seems easier, but won't support the bottom bit of the tile as well.
Any advice appreciated.
Red
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wrote:

What I'm reading is you have a void between the wall tile at the pan, where they mate?
Please post a pic on a free site like tinyurl hosting....
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I'd say just caulk/grout it. There's no thinset there because the thinset was put on the wall. That is what's holding the large tile to the backerboard.

Support in what way?
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red wrote:

The little bit overhanging is amply supported by the big chunk above it, and as it isn't in a loction which receives much, if any, load, you don't need anything behind it.
Well, you do need to caulk between the top of the tub lip and the bottom of the CBU, but you already knew that.
Jon
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red wrote:

The joint between the tile and the base should be caulked, right? One assumes that the space not covered by thinset should be very small, so I would not worry about it - it would take a freak accident to break it. Normal caulking will probably fill it, and I would be inclined to do the caulking in two stages to allow those gaps to cure comepletely before doing the final line.
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wrote:

guess that rules out silicone - never had much luck getting new silicone to stick to old.
no pictures, don't know how to get a shot behind the tiles. ;-)
as for freak accidents, there are a few freaks in the neighbourhood, but I don't let them shower here.
tks to all.
R.
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