Using 610 x 610 x 15 marble tiles on bathoom walls

[si.cleary]

My bad, just read initial post and a few weeks have already past, so all good! After adhesive and grout you should still have 40kg + to play with.

 

[nybor62]

Rendered walls - (Maximum weight loading 40kg – 50kg/m2):
Tiles can be fixed directly onto sand and cement renders this is an ideal base particularly for very thick handmade
tiles and natural materials such as slate and stone etc. New render must be at least 14 days old (21 days in total
immersion areas), or until suitably dry, prior to tiling. Dusty surfaces must be thoroughly dry brushed. Porous renders
must be primed with Fired Earth Primer diluted 1:4 with water. The primer must be completely dry prior to tilin

got this of the fired earth website . and i was wrong ,