We’re putting cement backer board over our subfloor before tiling, but the cement board seems to be warped slightly. Is it still okay to use? -Lynn

Hi Lynn,

Unless the cement backer board is severely warped, it should be fine to use if:

  • The subfloor is flat and smooth with no depressions or humps.
  • The cement backer board is set in a bed of thin-set and attached securely to the subfloor with backer board screws, so that the backer board lies flat against the subfloor. Be sure to screw down the cement backer board at regular intervals, as well as anywhere it warps upward away from the subfloor.

Good luck with your project,


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    Danny Lipford


    Danny Lipford is a home improvement expert and television personality who started his remodeling business, Lipford Construction, at the age of 21 in Mobile, Alabama. He gained national recognition as the host of the nationally syndicated television show, Today's Homeowner with Danny Lipford, which started as a small cable show in Mobile. Danny's expertise in home improvement has also led him to be a contributor to popular magazines and websites and the go-to source for advice on everything related to the home. He has made over 200 national television appearances and served as the home improvement expert for CBS's The Early Show and The Weather Channel for over a decade. Danny is also the founder of 3 Echoes Content Studio, TodaysHomeowner.com, and Checking In With Chelsea, a décor and lifestyle blog.

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