If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
Tiling on chipboard wall.
The preferred method for tile installations is to use a sheet of underlayment.
You will be able to see the lines through the mastic.
Team of 99 aug 8 2010.
The wall surface should be installed or corrected so that there are no deviations greater than in 10 feet.
I hve tiled on chipboard in my own home.
It was a casing in the kitchen that i made to house all the pipework and venting to my boiler.
You can do this either by covering with a 10mm layer of weberfloor flex 6mm tile backer board or 15mm plywood.
For shower walls and tub surrounds install wonderboard lite 1 4 backerboard.
Used a waterproof adhesive tiled it and never had a problem with it in over ten years.
For wall installations plywood is overkill beneath the concrete or fiber board which is designed in five eighths inch material for wall settings.
Depending on the amount of movement and deflection you may need to strengthen the substrate before tiling.
Water damages chipboard once chipboard gets wet it swells and falls apart which will lift your tiles.
Use our guide on strengthening a wooden floor for tiling to do this.
Step 3 spread no sag mastic adhesive along the bottom of the wall with your notched adhesive trowel covering everything from the floor up past the horizontal line.
If you install tile directly onto the chipboard it will eventually crack and break.
Draw a vertical line up the middle of the wall from floor to ceiling intersecting the horizontal line.
Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
Strengthening the substrate will decrease the amount of movement associated with timber and non tongue and groove floorboards and chipboard.
There s nothing at all you can do about chipboards hatred of water for this reason don t use chip in a wet room or any constantly wet area.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Newer green chipboard is used to help with this but still isn t perfect.
Mix up some thinset and apply it to the bottom of the concrete board.
This will help adhere it to the chipboard and keep it from moving.
Hang a batten board to prevent tile slippage a batten board helps you start your bottom most course or row of tiles.
If possible you should always use concrete board underlayments rather than plywood.
Repair any loose or cracked tiles.
When installing over chipboard you need to install concrete board over the top of it before tile can be installed.