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Good Day,

I want to Tile a wall that has been made with Aerated concrete blocked. As I am not a good plasterer, I intend to Dot and Dab Drywall onto the wall to get a lovely even finishs before tiling the wall.

The question is, will "Dot and Dabed" Drywall be stable enough to hold tiles?

I know when creating a Drywall Wall using wood or metal framework, it is recomended to lay two layers of drywall for stability, however if sticking the Drywall direct to the walls, I assume one layer should be fine?


Many thanks
Dale Harris

One layer is fine with a continuous bead of bonding compound (drywall adhesive) around the perimeter of the board and a continuous vertical bead at 400mm intervals.

Then you need to keep within the tiling limits of plasterboard regarding weight. The weight being adhesive, tile and grout. Not just the tile.

Substrate Weight Limits
(A substrate is the surface you are applying tiles to concrete floor, floorboards, plaster etc.)


Plaster Skim on Plaster Board........20KG
Skim and Set Plaster...................28KG
Plaster Board.............................32KG
Sand and Cement.......................40KG
Cement Backer Board..................55KG
Hardibacker Board.......................45KG
Lightweight Tile Backer Board........40KG
Glass Reinforced Cement Sheet.....50KG
Gypsum Fibre Board.....................40KG

Remeber to factor in the weight of the tile / m2 AND adhesive and grout

Grout.........2KG / m2
Adhesive....4KG / m2

6mm Notch 10mm Notch
6mm Ceramic......... ..14.26 kg/m2 .....................................18.46 kg/m2
8mm Ceramic ...........17.62 kg/m2 .....................................21.82 kg/m2
10mm Ceramic ..........20.97 kg/m2 ....................................25.17 kg/m2
12mm Ceramic ..........24.32 kg/m2 ....................................28.52 kg/m2
10mm Porcelain .........23.88 kg/m2 ....................................28.09 kg/m2
12mm Porcelain .........27.82 kg/m2 ....................................32.00 kg/m2
10mm Natural stone ...31.10 kg/m2 ....................................35.30 kg/m2
12 mm Natural stone ..36.48 kg/m2 ....................................40.68 kg/m2
20mm Natural stone ...58.00 kg/m2 ....................................62.20 kg/m2

All approximate, weights change with each manufacturer but if you stick to this you won't go far wrong