i have been on the topps website and armed with the name on the receipt and the code number it wont post any details on the tile , so for the weight i dont know other than 33cm square and 8mm thick as i said in the first post.
Check the box sometimes the weight sq/m is on there or weigh a tile & work it out; if not post it here & I'll work it out. You should be OK for unplastered boards (32Kg/m²) but could be getting near the limit for plaster skim 20Kg/m² .
i was intending to prime the p/bd with mapei primer g, it says on the sideits ok for gypsum based products
You must acrylic prime plaster/plasterboard when using powder cement based adhesive &, ideally, you should always use tiling product from the same manufacturer to eliminate any possibility of a reaction due to product incompatibility but Mapei primer should be OK. Beware, Mapei Buildfix products (as sold in some DIY sheds) are not the same as trade Mapei.
the bathroom is in a bungalow with concrete floor
Assuming your tiling the floor, do you know what type of screed; some newer properties use Anhydrite screeds which is also gypsum based, if in doubt prime that as well.
i read the sticky before i posted and found it very helpful but felt it did,nt answer the points i put in the first post
The Sticky doesn’t cover everything & ideally needs up dating; I always suggest reading it in conjunction with the Tiling Forum archive posts.
i have purchased moisture p/bd for the job
Even if you’re using Moisture Resistant plasterboard, I would strongly advise you to tank it around a bath. As your not having a shower over the bath, just replacing the board immediately around & over the bath would be better than nothing; probably 3 small sheets of Aquapanel. Tape all board joints & seal with tile adhesive, working it well into the mesh as you tile.
Rapidset flexi only has a pot life of around 40-45 mins so only mix up what you can use in 30-35 mins, wash your tools & mixing bucket well before mixing the next batch or the old adhesive will reduce the pot life of the new mix. If not use Single Part Flexible which has a much longer pot life but you can’t grout for 16 hours.
Leave a 2mm gap between the top of the bath & underside of the tiles for silicone seal, fill bath with water before applying silicone & leave to dry overnight before emptying; use quality sanitary silicone.