Dear Sir/Madami have question regarding installing tiles 30*30cm*2.5cm thick for hall and rooms my question is whats the min. and Max. cement mortar must be placed under neath tiles (i.e bond coat in between concrete slab and tile )please advice and thank for help and appreciated
If you're using ceramic tiles (very regular size and relatively smooth/even back), use a 1/4 square notched trowel, held somewhere between 45 and 90 degrees (vertical). If you're using natural stone tiles (e.g. granite, marble, slate), go for 3/8 square notched trowel and back-butter the tiles. Make sure the concrete slab is clean, sound, free of cracks and level before you start and follow the instructions for your thinset. You'll likely want to use a modified thinset which will help bond to the concrete better. If you have any doubts about the stability of your slab, consider installing an isolation membrane between the tile and slab. Schluter's Ditra system is the best of the breed for this. If you use an isolation membrane, use unmodified thinset (instead of modified).
