The recommended maximum weight of tiling for plywood is 30kg m.
Tiling onto plywood wall.
The preferred method for tile installations is to use a sheet of underlayment.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
It contains oils that are sensitive to temperature changes.
If you re not sure if you have lead paint test kits are available.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.
The heat will only loosen the grip of the adhesive.
Use thinset with a higher latex content thinset is the wet base that you first trowel on the plywood to make the tile stick.
Tile backing boards are ideal for wall tiling as they offer a dimensionally stable wall background to moisture and thermal movement.
Under british standards bs 5385 part 1 plywood has now been excluded as a suitable substrate material for the direct fixing of wall tiles therefore when tiling on to walls a tile backer board is required.
Although wall tiles can t expand and contract plywood can be used for tiling your floor.
If possible you should always use concrete board underlayments rather than plywood.
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As plywood goes under a continuous change in size tiles and grout can crack and cause irreversible damage.
Plus they offer an additional benefit over plywood including increased weight limits for tiling.
While tile can be laid on plywood do not install tile directly onto the plywood subfloor itself.
However tiling onto plywood floors is still acceptable under british standards.
For wall installations plywood is overkill beneath the concrete or fiber board which is designed in five eighths inch material for wall settings.