Do I need to lay plywood before I lay down cementboard

backer-boardbathroom

I'm remodeling my Bathroom and I had to lay down new 2 x 6" T&G boards. I plan to lay tile so I bought Hardiebacker (cement backer board). I was planning on laying down the backer board, lay thinset over T & G boards then backer board, but after reading a lot of sites I'm not sure if this is the best way to go. My tile area will be about a 4' x 5' foot section on the floor. I'm also reluctant to put down 1/2" plywood then backer board then tile because it will create a big lip between the bathroom and hall way.

Best Answer

If those T&G boards are your subfloor, you'll be fine putting the cementboard panels right over them. Just screw them down to the wood subflooring with plenty of screws; don't use thinset for that. DO use thinset to cover the cementboard seams and screw holes, then tile right over it.