On 7/2/2016 4:01 PM, Michael Wilson wrote:
That is the question.

I'm going to take out the carpet from our living room and install tile. The subfloor is 3/4 OSB. Can I just put tile backer board on top of this or not? If so, should I go 1/2 inch instead of 1/4? I see a lot of conflicting information about this. Most say it's ok, but we talked with the Home Depot guy and he insisted it needs to be plywood. What thoughts?

Thanks!

Mike


The tile manufacturer usually specifies the maximum allowable
deflection. Sometimes larger tiles require a stiffer floor.

For example, my floor trusses were 24" OC and 28' long (28'x28' room) so
I had to have 1.875" of combined plywood thickness. My wife and I were
screwing on the floor for days...and then we had to lay the tile.

http://tiledoctor.com/how-to-tile/deflection/