Originally Posted by
e3NiNe
You're my hero. For reals.
:draco:
Originally Posted by
b00gers
Thanks for the tips.
Before putting the backer board on, how much of a floor do you have under it? And what type. I am getting ready to remove my laundry room floor and replace it. I have heard from .75" to 1.25" of plywood or osb over the joists before doing anything else do it. I feel like 1.25" is overkill and will make my floor super high
My laundry room is probably only 4x8 or something like that.
It is not the thickness you need to worry about, it is the deflection. The lowest amount of deflection you can have and tile to be successful is L/360 (which is a 1/3" of deflection). As long as your floor joists are ok, 3/4" plywood and then the 1/4" backerboard you will be fine. Make sure you put down 3/4" OSB though, not 3/4" plywood, there is a huge difference in tensile strength.
http://newstore.southernpine.com/images/ref202.pdf
My new house is built to l/480 and l/600 in spots. Floor is solid as a rock.