Dirt plaster adhesive and all manners of stuff will be ground into it before the tiler gets round to tiling it.
Do you need to seal a concrete floor before tiling.
Reply to do i need to prime a concrete floor in.
New concrete floors or screeded floors are a different matter.
Once you clean all these agents off the top of concrete you can begin preparing the surface.
Step 3 mix.
Discuss do i need to prime a concrete floor in the tiling forum tile advice forum.
From my understanding the screed will not need sealing if you are only going to fit laminate or carpet.
A concrete floor should be sealed to protect against moisture but the sealer can interfere with the tile adhering to the floor.
With just a little extra work you can seal your concrete floor and.
Cleaning and filling any cracks in the floor takes a little time and the only precautions to take prior to tiling are to make sure that the floor is completely dry as the thinset used for tile needs a moisture free environment.
The following steps will allow you to prepare a concrete floor before you lay your tiles.
However if you choose to use concrete backerboard which is much stronger and more durable than gypsum board a water vapor membrane must be placed underneath it or a sealant applied on top of it.
You need to clean any paint sealant or glues from the surface of the concrete.
Cement on top of slab is solid and not flaky i dont worry about it i like the glue to be absorb into the slab but if u seal could not absorb u dammed if u dont and dammed if u do been tiling 29 years cheers.
To prevent that movement from creating cracks in your grout and tile install a crack prevention membrane after the concrete subfloor is clean flat and free of cracks larger than 1 8 inch.
A freshly screeded floor should be sealed before tiles are fitted unless a screed has been used that does not need sealing priming this screed is usually dust free so it seems as yours would require sealing for tiling.
So your nice new clean ply floor isn t so clean anymore and if it s not prepared properly prior to tiling the adhesive will just go onto the dirt on the floor and might not stick.
Take some water and mop the surface to remove any dirt dust or small debris.
You can either roll on a liquid latex membrane or use a peel and stick crack prevention mat over the entire concrete subfloor.
Concrete sealant or paint prevents the adhesive from sticking properly.
Roughening the surface is needed for the sealer to stick properly to the concrete.
These membranes prevent water from seeping up.
This is particularly imported when laying tile as the floor needs to be as level as possible.
Use filler to fill in any dips and apply a floor leveler for any humps in the floor.
For that reason it is best to use an elastomeric crack prevention membrane to both seal the floor and protect your tile installation from failure.
