id say thats wrong..... grout wont stick very well to the glazed bevel. tiles need a gap to expose the side biscuit so grout can adhere to. tubbed adhesive on shower wall? no waterproof membrain?
if u not leaving gap for grout between tile and trim then put a bead of clear Silicon where tile butts upto trim. otherwise theres potential for water to get behind tile if in wet area
600 rectified tiles? Most definitely needs a tile leveling system for a superior finish. The reason he used 7mm grout lines was an attempt to limit lipage. 2mm grout lines (max3) with zero lipage should have been the goal
if overboarding with backer board make sure they are mechanically fixed as well as bonded with adhesive…. or you are just adding to the weight on the skim
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….but I think if you get about 90% of that paper off it will be fine to tile on once u have sealed with sbr or similar
all depends on the quality and integrity of tile and grout. at very least you should seal grout with a quality sealer. I think you will always have the wet circle problem until you ripout and redo.prob board walls before tiling if they cold
the cold from the wall is transferring thro the adhesive to the tile which is condensating causing the wet circle. The air pocket between the dabs is acting as a barrier hence warmer spot around the dabs. once heating is on the tiles uniformly warm so no condensation.... just my thoughts
In her defence the local screed contactor told her no need. So I got in touch with manufacturer and they said same, as long as commissioning process is followed to the letter, but they wouldn't discourage me from using one 😏