The floor and subfloor combined should be at least 1-1/8 inches thick for proper support. This will cause either the tile itself to crack and even come loose, or cause the grout to crack inside the joints. Installing a glue down vinyl floor (sheet or tile) directly over Oriented Strand Board (OSB) Subflooring has become a hot topic for me of lately.I have had people asking about installing sheet LVT, and VCT directly to the OSB Subfloor without the use of an underlayment. If you want to know why- it’s because it pretty much doesn’t matter what the subfloor is under that plywood. The subfloor, which is typically a layer of plywood or oriented strand board (OSB). The HD on-line project instructions say that when installing porcelain tile, that it should be over exterior grade plywood, but that "Oriented strand board, or OSB, and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backerboard." We are trying to lay slate tile in an entryway. Laying tile to veneer plywood risks loosening and unbonding the veneer, creating an unstable base for the tile. Plywood or OSB (flakeboard) can expand and contract at too high a rate to be a stable foundation for tile. Put the tile on the OSB slab is quite possible with your own hands, if you carefully read all the nuances of this process The need to install tiles on the OSB basically arises if the house was built using wireframe technology. According to backer board manufacturers and tile setters, installing backer board directly over an old, solid-wood subfloor is risky for a couple of reasons: First, changes in humidity make solid wood shrink, swell and cup more than plywood. Particleboard is not an acceptable subfloor material for tiling projects. Space the Field and Edge Fasteners Correctly The top layer of plywood should be screwed down every 8 inches on the edge and every 6 inches in the field, or interior, section. The underlayment for ceramic tiles, is the final layer that lies directly beneath the surface flooring. Direct Gluing Vinyl Sheet and Tile to OSB SubfloorsInstalling a glue down vinyl floor (sheet or tile) directly over Oriented Strand Board (OSB) Subflooring has become a hot topic for me of lately. The 24" oc joist with 1/2" wonderboard is the only one requiring plywood as opposed to osb. But, you cannot bond tile to osb because the resins used to make osb will not allow the thinset to remain bonded for very long. We just read the article in Fine Homebuilding No. They also have a proprietary 1/2" wonderboard over 3/4" t-g exterior plywood subfloor where joists are 24" oc. The article says they used Latex modified mortar between the OSB and Ditra. 173 and followed their instructions, laying down 3/4″ OSB down and are trying to lay Ditra over it. It is such a construction at the moment is particularly popular due to the fact that this method is environmentally friendly and refers to the budget. When installing over existing oriented strand board (OSB), an underlayment must be added between the OSB and the tiles. There are tile companies that actually use 3/4″ exterior rated plywood as their standard substrate with a quality modified thinset. It ALWAYS works. Oriented strand board (OSB) and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backer board. Installing ceramic floor tile to a plywood sub-floor has unique challenges beyond that of installation on a concrete floor. Peel and stick tiles can be installed over almost any type of subfloor, though it is important to properly prepare the floor first to avoid problems with your tile flooring. Most flooring vinyl flooring manufacturers do not allow direct glue down directly to the subfloor. You can have 5/8 OSB …

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