Hi,

Just started the shower room tiling (floor first).

I'm using 200x100x10mm travertine for everything. One thing has occurred
to me though - these are quite heavy. My scales are busted, but
comparing to a glass of water and tile in each hand, I'd estimate each
tile to be around 0.3kg or slightly more - rather heavier than a similar
sized ceramic tile.

That comes around 20kg/m2 and I've just read that skimmed plaster is
only rated to 20kg/m2.

This is not something I'd considered...



I am wondering, once the floor is grouted and sealed, whether to line
the walls with screwed tile backer board (the heavy stuff) or whether
I'm worrying too much?


Most of the walls are new celcon block with virgin plaster.

One wall is not - and has been skimmed 3 times in its life over the
plaster/sand undercoat on brick.

Cheers,

Tim


PS - the tiling is contracted out - too much for me to do and I don;t
really do natural stone. But I've been involved in the prep.

Tiler is not overly concerned, but OTOH it would be a messy and
expensive failure and we're not too late to switch some backer board in
(he can't do the walls for a month)