METALS
Metals can form a suitable base on which to tile, but success rates will depend on the type of metal, its form and rigidity.
Steel
It is possible to tile directly on to a rigid and deflection-free steel surface without the need to overlay with plywood.
First ensure that the surface is free from any dirt, grease or primers.
It may be necessary in atmospheres with high humidity, to also treat the steel surface with a rust inhibitor.
Adhesive application to Steel
If applying tiles directly to the rigid steel substrate, use an adhesive with high bond properties, such as PCI’s Ultraflex.
Please note - flexible adhesives are designed to accept lateral, horizontal,movements in but can not withstand deflection which may cause the brittle tile surface to crack.
Grouting
MASTIC ASPHALT
Preparation technique
Adhesive application
Prime the surface with PCI’s Primer G.
Use an even bed (between 3-4mm) of a cementitious adhesive such as PCI’s Nanolight.
Asphalt is not the strongest of surfaces so achieving an even surface is crucial as varying thicknesses of adhesive can cause the build-up of stresses which may result in tiling failure.
For vitrified or porcelain tiles use PCI Nanolight to promote bond strength at the tile interface.
Use PCI’s dedicated white adhesive for natural stones, Carraflex, along with Carrafug grout, both from the PCI Carra range for natural stones.
Grouting
Once the adhesive bed has set, grouting may commence.
Mastic Asphalt flooring requires a minimum grout width of 3mm.Use a grout to match the application.
For vitrified or porcelain tiles use PCI’s Groutfast 20 Rapidflex to promote bond strength at the tile/grout interface.
Drying will vary according to the site conditions.
Movement Joints
Please refer to Special Situations Bulletin 1 due to the complexity of this subject.
For more information, contact PCI’s Techincal Services Department on 0161 794 7411