I recently had a bathroom contractor install cement board on my subfloor, but they only used screws to secure it—no thinset. I'm curious about how crucial it is to use thinset in addition to the screws. Should I be concerned about potential shifting, or is just using screws adequate? Would love to hear your thoughts!
3 Answers
It's always a good idea to check the manufacturer's installation instructions since they know their product best. Typically, for tile flooring, cement board should be laid over a bed of mortar or modified thinset for added stability. So, if you want to ensure the best support, it might be worth mentioning it to your contractor.
Unfortunately, sometimes being a 'pro' just means they have a business license without the right knowledge behind proper techniques.
I usually prefer to use thinset along with screws, but it really depends on how level your subfloor is. If it's pretty flat, then I wouldn't be too worried about it shifting. Some might say thinset is overkill in that case, but I just feel better using it!
I'm a pro, and honestly, you don't always need thinset under cement board. A screwed-down installation is pretty common and should hold up fine for tile. Just make sure your subfloor is in good shape, and you should be good to go!