hello mate...
If it has been used for parking cars/vans etc ...Then if there is oil leaks etc this could cause any adhesives not to stick to these parts....
You will to thoroughly clean the floor first...maybe a jet wash and clean detergents etc....
Then check for any dips etc and level as necessary....
I would think about using Ditra on this job and this will take all the stress from driving vehicles over the tiles ....
These are my recommendations for materials.....
BAL Multibase
A polymer modified,
cement-based, rapid-hardening, water resistant, protein and ammonia free self-smoothing compound for use in interior areas. The product is pumpable and sulphate resistant and can be used to level a variety of bases including concrete,
cement:sand screeds, anhydrite screeds, adhesive residues, asphalt, terrazzo and unglazed ceramic tiles. Suitable for use under ceramic tiles, natural stone, sheet and soft floor coverings. Can be used from featheredge up to 5mm and from 5-20mm with the addition of 3mm granite chippings. Will accommodate thermal movement and limited vibration/movement. The compound can take foot traffic after 3 hours. Ceramic tiles can be fixed after 4 hours and soft-floor coverings after 24 hours.
The bottom of the square cavities in Schlüter-DITRA, which are filled with thin-bed adhesive, directly transfer the load impact on the
tile covering to the substrate. As a consequence,
tile coverings installed on top of Schlüter-DITRA are highly load resistant. If high traffic loads are expected (e.g. in industrial locations), the tiles selected for the installation must be of the corresponding thickness and pressure stability. The requirements of the mandatory guideline “Ceramic Floor Coverings With High Impact Resistance,” published by the German Construction Industry Association (ZDB) must be followed. In areas with high impact loads, the tiles must be fully embedded in the thin-bed adhesive. The contact surface of Schlüter-DITRA amounts to approximately 50% of the total surface. This can reduce the load bearing capacity in case of point loads. For high point loads, select a
tile thickness that is capable of distributing the loads. Ceramic
tile coverings should not be exposed to the direct impact of hard objects. The
tile dimensions should be at least 50 mm x 50 mm
BAL Motobond
A rapid setting, highly polymer modified, water, frost and sulphate resistant floor
tile adhesive, with exceptional compressive and adhesion strengths, specifically designed to withstand heavy loading and trafficking. Suitable for use on concrete,
cement:sand screeds, anhydrite screed, BAL levelling compounds, epoxy resin-based coatings, terrazzo, unglazed ceramic tiles, mastic asphalt. Conforms to BS EN 12004, Type C, Class 2F.
BAL Superflex Wide Joint Grout
A highly flexible, water and frost-resistant
cement-based powder grout with built-in admixture specially designed for use in areas where increased flexibility and enhanced durability are required. Suitable for grouting tiles with joint widths up to 20mm. Suitable for interior and exterior locations on both wall and floor tiling. Ideal for grouting limited movement areas such as timber floors or heated screeds. Suitable for grouting in swimming pools. Conforms to BS EN 13888, Type C, Class G2.
As for the tiles i would use a porcelain bodied
tile..large format....
good luck..........
p.s...You will need to think about expansion joints in the floor as well.... fixed at intervals according to guidelines....
