Home > categories > Construction & Real Estate > Cement Boards > tile flooring on a cement slab?
Question:

tile flooring on a cement slab?

Hi, I have an outside breezeway that connects from my house to my garage with a roof and cement slab. I'm in the process of closing it in and making it part of my house(fully heated). I'm going to tile the floor but I'm not going to have a sub floor to insulate under it, I worry about moisture, cold floor and cracking of tiles (I live in Michigan).So my question is I'm not sure on how to go about this, I was thinking a 1/4 to 3/8 insulation rolled on the slab, then cement board and then thermostat controlled heating mat then tile, What do you think, thanks.

Answer:

All of that is not necessary if the cement is not cracking from moisture. If it is, then I say go for it, at least you will have warm feet.
May 11, 2017
The whole point of backboard is to make the sub-floor rigid because tile can't move at all or the grout will crack. Since it is concrete, you're right, there isn't any point in adding anything to it. As long as your concrete is not cracked you should be good to go. Once you get the linoleum up, you just need to make sure that the concrete is nice and level. You may have to add some leveler (it's like really runny concrete), because you don't want to rely on the adhesive to level out any imperfections in the floor.
May 11, 2017
Unless your concrete is already cracked you shouldn,t have any problem. I would make sure no ground water was allowed to accum. near the walls especially if you have no footing under your breezeway slab The heating mat. is a good idea. I would go right over the slab with the mat and porc. tile. Good luck ,and have fun
May 11, 2017
I agree with William, use a rigid insulation rather than a roll insulation. It would be pretty much impervious to moisture. A roll insulation would eventually hold any moisture and get moldy and lose any r-value.
May 11, 2017
u don't need any of that go ahead and laid u ceramic tile over the concrete floor moisture just help the thin set to harder in the long run if u were laying wood floors a will said is ok but u are just fine,good luck my friend.....
May 11, 2017

Share to: