Sand with a medium grit sandpaper to create a uniform surface that s not too smooth.
Sealing plaster walls for tiling.
It should be a minimum 12 5mm thick when fixed to timber framing or battening and fixed in accordance with the manufacturers recommendations.
Bear in mind that raw brick blockwork and cement are mostly uneven.
Plaster is a weak material compared to brick and cement.
When applying tile to a plastered surface it is important not to overload the weight of what the plaster will take before failure occurs plaster will support about 20kg m2 or about a 9mm thickness of ceramic tile.
Make a mark on the wall with your starting point.
Tiling onto plaster backgrounds.
Thoroughly vacuum the area and give the wall a once over with a damp sponge or cleaning cloth.
Seal the walls with a skim coat and let it dry thoroughly.
I d just stick the tiles on nix though i would key the plaster with sand paper i normally tell customers to leave fresh plaster for a week if painting then to apply a thinned out undercoat they all nod but as soon as it looks dry the paint is on the wall.
What is the best option to prepare newly plastered walls for tiling.
Tiling onto plasterboard walls preparation for tiling onto plasterboard plasterboard should be dry securely fixed and rigid with no protruding fixings with the face to receive decorative finishes exposed.
Concrete plywood drywall or painted surfaces tiling requires appropriate preparation.
1 paint over area with watered down matt emulsion 40 water 60 paint 2 cover area with watered down pva glue.
Fresh plaster takes up to 30 days to dry and wooden surfaces can use a layer of polyurethane paint.