While many industry sources, such as the TCNA, approve of these six underlayment options for ceramic tile, not all contractors or industry organizations agree. Trade organizations that serve the professional installation audience may argue that removal of the existing underlayment, and installation of new cement-based backer board, is the only method that truly guarantees a trouble-free ceramic tile job. Such opinions have some credence since these trade organizations are devoted to making sure that professionals have few callbacks for installation failure.
If you hire a tile professional, you may find that they resist installing ceramic tile over sheet vinyl, for example, or has other preferred methods. If so, it's a good idea to abide by their recommendations. The goal of any contractor is to avoid callbacks for failure, so if they recommend a certain method, it's probably for a good reason.
Some materials should be avoided as underlayments for ceramic tile:. Tile Council of North America, Inc. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors.
Featured Video. Related Topics. Article Sources. The Spruce uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Read More. Your Privacy Rights. Have not done any thing yet. Going to leave some carpet what need to be done between the carpet and the tile. Thank you. The main reason for the cement underlayment is to have something for the tile to adhere to since will will not bond to wood.
I go right off TCNA guidelines. Apply thinset over tape and joints. Please do not tile directly over plywood. A contractor did that in my kitchen some years ago, and resulted in very severe cracking of the tile and grout. It looks horrible. Better to have it a little higher than deal with that kind of mess. This information is completely wrong.
Unfortunately the opinion of one person with a blog or website becomes gospel to all of those reading this. Do your homework before making these comments. The obvious drawback is that the height of the floor gets to be pretty high at times and you have to watch the height of exterior doors, etc. Consult professionals with these questions. These blanket statements becoming gospel are ridiculous and they happen all too often. I am currently pulling up ceramic tile that I foolishly applied over plywood two years ago.
My shortcut really cost me. The house is build tongue-in-groove OSB floorboards and thats it. No other substrate of any kind on top of that. If I ever need to take up the carpet in favor of some other kind of flooring or even different carpet that glue is gonna be a next to impossible to remove. Suggestions anyone? I worked for a friend as a helper. He has 30 years experience.
We would have tile jobs sometimes over 10, sq. We would also do remodels. Yeah sure I pulled up tile off wood subfoors that looked fine.
In fact the majority of them were ok. Why take the chance? Do it right the first time. Uh oh! My contractor just finished laying sf if porcelain floors directly over plywood in my kitchen. When I had asked him if he needed me to purchase backer board. He said no, that he could lay it directly over the. Did I create a bigger problem for myself?? Does anyone know of flexible grout will flex enough to last on a 2nd floor without anything on top of the plywood?
If I apply a layer of Redgard on top of that will it be ok to lay tile on that? If you screw the boards down every 6 in you will have no problem. Been doing it for 15 years with no complaints from any customers.
I am using a polymer modified mortar. Thank you for all the informative posts. Wow, reading horror stories. Some wood floor systems, when designed to minimum standards, have too much bounce. This bounce will crack the tiles. Floor joists are basically wood I beams. For a given floor joist, as you increase the distance between supports, the joist will deflect a greater amount. Assuming your joists are 1 grade and the span is no greater than 16 feet 9 inches, you can proceed. If you're putting ceramic tile in your home, check out my Ceramic Tile Installation Checklist to learn exactly what you should know about the process.
Avoid making costly mistakes with the help of this document. Both will perform exceptionally as long as you install them carefully. Your existing subfloor should be securely attached to the floor joists.
Drywall screws work well. Use ones that have coarse threads. If you choose to use exterior plywood, the spacing of the sheets is critical.
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