Checking for curing compounds or other contaminations on concrete substrates
This is what you should consider
To ensure an excellent bond is achieved to a concrete substrate, Waterproofing and Tiling end-users should always check for curing compounds or other contaminations by:
- Taking a bottle of water and placing droplets of liquid randomly over slab.
- Revisit the area after 10 or 15 minutes to see whether any water has been absorbed into the concrete.
- If the water has not been absorbed then the floor has to be mechanically prepared. For example, the concrete should be ground using an electric grinder with a diamond disc to remove any contamination.
- This preparation will provide you with a good bond to the substrate.