Tile a concrete floor

[johnad]

Hi
I'm about to tile the whole bottom floor of an old cottage all the floors are concrete and quite dusty due to building work etc
Should I seal them first or use a levelling compound to give myself a good surface or will just a good wash do ?

 

[gcol]

Quote from the sticky post.

What adhesive/grout
Solid floors - Concrete / Asphalt
The type of adhesive you use depends on the tiles you've selected. For regular ceramic tiles you can use a regular rapidset powdered adhesive. For porcelain tiles you need to ensure that the adhesive is suitable for use with porcelain tiles. You don't need any fancy adhesive for tiling onto solid floors - there's no reason to spend more than £10 for a 20kg bag. Feb fastset wall and floor tile adhesive is cheap and works very well.
Sweep, vacuum then mop the floor twice to ensure it's clean.
If the instructions on the adhesive recommend a primer then you should use it.
Powdered floor grout should be used - I recommend grey colour because most other colours look grubby quickly.