I have taken my bathroom back to brick and have purchased the NoMorePly 12mm fibre cement boards to install. On some walls, the bricks are laid with the stretcher face showing, allowing a maximum fixing depth of 115 mm, while on another internal wall, the frog face is showing, allowing a maximum fixing depth of 80 mm. I am going to use adhesive foam and mechanical fixings, allowing 10-20mm of adhesive foam bed between the board and the brick.
The plan is:
1. Prep the wall surface, use SBR on both wall and cement boards
2. Damp with water both surfaces
3. Apply SOUDAL Plasterboard adhesive foam on cement board and let it get stringy
4. Press the board to the wall, level, let it set for ~20min
5. Drill 6mm holes through cement board to the brick at the depth of 40mm for each corner of cement board
6. Push in Fischer DuoPower 6 x 30mm plugs into the brick
7. Use SPAX Stainless Steel 5 x 80mm screws to secure the boards
8. Repeat the process above and use NoMorePly adhesive between the joints
Have a few questions about the above plan:
- Are the screws and plugs enough to hold the cement boards and the weight of the tile adhesive and tiles? Each plug should hold 50kg of force on solid brick (so 200kg total per board). This in combination with the plasterboard expanding foam adhesive feels like should be plenty strong.
- Are stainless steel screws necessary, or would regular SPAX Wirox screws work? I am going to tank most of the walls for tiling, however some will be painted and need to be plastered. The stainless steel variety are hard to find in 5 x 80mm.
- Some bricks are sticking out way further than others (2-5cm). Can I grind them with a masonry grinder disc? It is only few brick per wall, rest are fairly even. I don't think the structural integrity would be a concern.
- Should the boards be staggered?
The plan is:
1. Prep the wall surface, use SBR on both wall and cement boards
2. Damp with water both surfaces
3. Apply SOUDAL Plasterboard adhesive foam on cement board and let it get stringy
4. Press the board to the wall, level, let it set for ~20min
5. Drill 6mm holes through cement board to the brick at the depth of 40mm for each corner of cement board
6. Push in Fischer DuoPower 6 x 30mm plugs into the brick
7. Use SPAX Stainless Steel 5 x 80mm screws to secure the boards
8. Repeat the process above and use NoMorePly adhesive between the joints
Have a few questions about the above plan:
- Are the screws and plugs enough to hold the cement boards and the weight of the tile adhesive and tiles? Each plug should hold 50kg of force on solid brick (so 200kg total per board). This in combination with the plasterboard expanding foam adhesive feels like should be plenty strong.
- Are stainless steel screws necessary, or would regular SPAX Wirox screws work? I am going to tank most of the walls for tiling, however some will be painted and need to be plastered. The stainless steel variety are hard to find in 5 x 80mm.
- Some bricks are sticking out way further than others (2-5cm). Can I grind them with a masonry grinder disc? It is only few brick per wall, rest are fairly even. I don't think the structural integrity would be a concern.
- Should the boards be staggered?
