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.
Seal concrete floor before laying laminate.
A concrete floor should be sealed to protect against moisture but the sealer can interfere with the tile adhering to the floor.
Clean the concrete surface and apply a thinset compound to all of the low areas until the surface of the concrete pad is smooth and level.
Remove any carpet or other flooring.
However to prevent moisture from the concrete floor from affecting your laminate install a vapor barrier of polyethylene film.
If your concrete passes the moisture test then plastic sheeting at least 6 mils thick will prevent moisture from getting into your laminate flooring.
Where plastic sheets must be joined overlap the sheets by several inches and use strong vinyl tape to secure them.
From my understanding the screed will not need sealing if you are only going to fit laminate or carpet.
By thomas west a concrete floor may need a moisture barrier before vinyl flooring can be installed.
Pour self leveling cement into any dips in your floor and level off with a trowel.
Leave it long at each end of the room you ll trim the length after the floor is installed.
Although rubber underlayment will disguise shallow troughs for a short while your carpet will start to look uneven with wear.
Add about 10 to that number to account for any possible mistakes and warped boards.
For installation of vinyl flooring you need a smooth even surface for the underside of the flooring to achieve the best contact for adhesion.
If you have a vinyl floor you may be able to install your flooring directly on top of it.
With just a little extra work you can seal your concrete floor and.
You don t need to seal a concrete floor before installing laminate.
Determine how much flooring and materials will be needed.
Preparing the concrete surface before laying laminate flooring acclimatising laminate floor usually the sealed packs must be stored flat on the floor for at least 48 hours in the room they are to be installed.
Install a plastic vapor barrier.
Allow the thinset to completely dry before you seal the.
Unroll the underlayment and moisture barrier if needed in long strips joining each row with tape being careful not to overlap the edges.
Use a self leveling compound to fill any dips in your concrete floor before applying a sealant.