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You can used exterior grade plywood when tiling floors, but it is only an acceptable choice. If going over a wood substrate, the best choice is a mudbase or cement board.
A cement board can be used on the exterior of buildings . Cement boards are also convenient when making patios and decks as an extension in modern homes
You couldn't tile directly over a plywood sub-floor because over time, the wood will be expanding. There are products you can use in between the plywood and tiles to keep them in place such as cement backer board.
Used instead of plywood. Oriented Strand Board
Manmade boards include plywood, pressboard, chipboard, particle board, and similar materials made from wood, as is MDF (medium-density fibreboard) which is cemented wood fibers. The exterior material Hardie board (cement board) is actually made of concrete fibers, and the original products contained asbestos.
Ficem Board is a light weight fiber cement board which is immune to permanent moisture damage.Marine PlywoodMany Australians grow up with the belief that Marine Plywood is a 'special' product made with secret adhesives that make it virtually indestructible. This is an urban myth.The adhesive (glue) that is used to bond the veneers of Marine Plywood together is the same as any other structural plywood that is manufactured in Australia.Marine Plywood is designed to absorb these forces due to the fact that this plywood is the closest to solid wood. In fact it is better than solid wood with defects having been graded out.
No, plywood alone is not strong enough for ceramic tile. These floors require a very sturdy subfloor at least 1 1/4" thick before the tile. This requires either using cement board or a pored mudbed.
You need 1 1/4" of subfloor. Typically it is 3/4" of plywood or OSB and 1/2" of mudbase or cement board.
Cement board, at most contractor supply places it will be called DUROCK cement board or Permabase cement board. = =
Plywood, fiberboard, or cement board is the best underlayment for floors, depending on the type of floor being installed. An underlayment provides more stability and a smoother surface to the finish floor.
If you are inhaling cement board, you need a qualified safety professional or industrial hygienist to show you how to do the work without inhaling cement board.
Improper installation. You must install cement board over the sub floor before you tile. If the tile was glued to plywood which is not waterproof, the plywood will absorb moisture which will cause the grout to crack and deteriorate