Case 1
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Remedial (see also Remedial)
Cleaning by water coupled with scrubbing or high pressure water jet could effectively remove most of the stain from the stone cladding surface. Cleaning should begin at the top so that excess water can run down and pre-softens the dirt below.
Acidic cleaning agents should not be used for granite as it attacks the pyrite (iron sulphide) inherent in granite, resulting in a brown stain.
Find the source of water ingress if any, stop further water ingress using methods such as sealing, injection, impregnation (see Remedial).
The affected areas should be washed cleaned with pressure jet and an abrasive cleaning agent. Washing should begin from the top. After the dust and dirt have been removed, the debonded tiles can be re-patched. Care must be taken in selecting the adhesive used so as to ensure effective adhesion to the concrete backing.