I'm still a little confused... I'm DIYing my bathroom, and am still uncertain about whether I get a tiler to do or have a go myself.
Having been lurking here for a while, I've picked up loads of advice but some things about weight still confuse me!
I have stud walls that are made with 9.5mm plasterboard; am screwing& glueing plasterboard to the one existing wall to give a flat surface that will take 32kg/m2
the wife has selected a 10mm large format Travertine honed and filled; the weight of tile +addy comes in under the limit for 3mm, over the limit for 6mm.
First question; if I have reclad the walls so they are absolutely flat, do I need more than 3mm?
Second question; If you have to 'butter' the tiles, does the weight go up, or is the weight of the tile based on no holes in it?
Third question; some people talk about not forgetting the weight of addy PLUS grout - surely the grout goes in the gaps that would otherwise have tile in them so the overall weight per square metre shouldn't go up?
Fourth question; the joists are in reasonable nick; I have reinforced them with metal bands, am going to screw down the boards and have nomoreply and fixings to go on that. The joists though are 400mm centres (300mm gaps) and so I'm putting some noggins in for more stability. How many or how far apart?
Sorry to be a pain, but after a month of lurking hoping someone else would ask these questions I thought I'd take the plunge!
David Goodier