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Ceramic tile floor stability

GeorgeP's picture

Hi,

I am going to be laying a ceramic tile floor In a 3 season porch.  The area is 13' x 16',  the subfloor is nailed and glued 3/4" AdvanTech.  This is being done on Cape Cod so, because of the hurricane requirements the floor is very stable and solid.  Jumping up and done there is no bounce or vibration at all.  The tile will be a large tile, either 12" or 14" square or perhaps rectangular tiles. 

I plan on putting down a layer of cement board before tiling.and then am considering using Ditra.  If I use the Ditra, do I need the cement board?

Because the room has large windows and will receive a lot of sun I am concerned about  expansion.  If I use the Ditra does that eliminate the need for expansion joints?

Thanks

 

tile install (post #215262, reply #1 of 4)

George

Skip the cement board in all cases.

The important question is what's the construct of the floor? joist size and spacing?

assuming 3/4" subfloor over 2x10 joist@16"O.C...........

, install 1/2' or 5/8" plywood, A/C grade, glue and screw.  Install Ditra over that, then tile away

Good Luck

Geoff 

Advantech is great stuff and (post #215262, reply #2 of 4)

Advantech is great stuff and will give you the base of a good floor. Since you're going to install cement board anyway I'd skip the Ditra. The cement board needs to be bonded to the Advantech with thinset and the Ditra needs to be bonded with thinset. No need for the second layer and you'd save a lot of money. I would not lay my tile on plywood especially on a porch. 

Florida Licensed Building Contractor, 50 years experience in commercial remodeling, new homes, home remodeling and repairs and all types building maintenance.

The joists are 2x12", 16" oc (post #215262, reply #3 of 4)

The joists are 2x12", 16" oc with a 14" double vlam as the midde suppoting beam.  

The joists are 2x12", 16" oc (post #215262, reply #4 of 4)

The joists are 2x12", 16" oc with a 14" double vlam as the midde suppoting beam.