Wall Tiling – Backer board

For wall tiling applications it is essential that the wall itself has sufficient inherent strength to hold the proposed tile and the adhesive being used.

The following chart lists the accepted maximum loadings for a variety of wall substrates. In all cases, it is advised that where wall boards, of any type, are used that the manufacturer be consulted for further guidance.

Wall Substrate Maximum tile weight (plus adhesive and grout*)
Gypsum plaster 20kg/m²
Plasterboard (gypsum) unskimmed 32kg/m²
Plywood (exterior grade) 30kg/m²
Gypsum fibre boards 40kg/m²
Tile backer boards 40kg/m²
Glass reinforced cement sheets 50kg/m²

*Typically the weight of the adhesive and grout is 2-4kg per m².

Wall types vary considerably but all have the same basic need to be structurally sound, strong, smooth and level.

It is important to understand that tile adhesives are not designed to be a method of overcoming surface undulations and unevenness.

The specifications for various substrates and their stability are listed below. Should any other substrates be encountered, please contact the UltraTile Technical Department.

Backer board

A – Studwork walls
B – Tile backer board
C – Jointing mesh to reinforce the joints
D – Prime (if using a ready mixed adhesive may not be necessary)
E – Apply adhesive (selected upon tile type)
F – Install tiles
G – Grout all joints

Instructions:
There are many brands of backer board, in all cases confirm with the specific manufacturer as to fixing and priming requirements.

Most are made of fibre reinforced cement or similar, in the absence of any further advice from the manufacturers they should be treated as per a plywood installation.