When plywood panels absorb water they swell wherever the water is absorbed.
Tile over osb wall.
In this episode of tiletv we answer the popular question can i install tile directly over osb.
It should be fastened to the subfloor using thinset and then screwed down every 10 square.
Osb must be protected from water or moisture exposure during shipping and throughout the installation process.
Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span 360 under total load.
Hence osb is rarely used for an underlayment tiler.
Ceramic tiling can be installed onto 23 32 osb subflooring panels where the panels are supported by 16 o c.
You can tile over plywood proper grade of ply because the proper thinset will bond with the continuous layer of wood veneer.
Tile can be safely installed to the redgard coated osb with one of custom s polymer modified thin set or medium bed mortars.
Osb will stay swollen while plywood will shrink back to its original thickness because the compaction force is lessened.
There are two materials commonly used for laying ceramic on plywood or osb that are applied before the tile.