What exactly did he use the plaster on; did he repair/re-plastered existing block work or plaster over new/existing plasterboard?Hi, am following this discussion with interest - now too late for me, but the builder (I asked him to p... off by the way) used plaster not plasterboard or waterproof board of any kind.
It’s perfectly OK to use WP1 over finishing plaster but the plaster must be thoroughly dry first – at least 4 weeks if it’s finish over base plaster. If you have block work walls, the best possible surface to tile over would be to re-plaster with base coat & finish or even re-skim existing finishing plaster if it not very good but the plaster must be applied properly & be reasonably flat or it’ll make the tillers job much more difficult especially with large tiles.What are your thoughts on using finishing plaster beneath the BAL WP1? My main concern is that it is not flat and therefore the sealux and tape didn't have an adequate surface area to adhere to in some places - and therefore nor while the tiles - which by the way i haven't dared start on yet. best wishes.