Case 4
Navigation
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Good Practices
Paint
Material
- Avoid vibrant colours that will show traces of discolouration easily. If it is necessary to use such colours, select colours that are more stable and are more resistant to weathering.
- Deterioration/ erosion of pigment may also be due to low quality paint or paint with water sensitive pigments.Use weather resistant paint or paints that are more stable. Application of paint system should follow closely to the manufacturer’s specifications to achieve best results [5,6].
Use only appropriate coat as recommended by the manufacturer. - Prepare receiving surface and apply appropriate sealer to protect the paint.Select a colour that is more stable and use an appropriate coating system.
Sunshading devices
- Installation of sun breaking devices can reduce the amount of UV light attacking the painted facade.
Water repellent and surface coating system
Clear water repellents are most effective at reducing the amount of water absorbed by the brick masonry. Thus, they can help reduce staining and fungi growth caused by moisture absorption, particularly on highly absorptive masonry.
Surface preparation is important. The surface on which the coating is to be applied has to be:
- cleaned by grinding, chemical etching or blasting.
- dried by allowing the wall to cure for a few days before the coating is applied. During rainy periods, the walls should be protected with a plastic covering so that the drying is not interrupted.
Other surface protection systems include:
- Impregnation systems:
- Prevent penetration of water and solutions into brick without hindering the escape of internal moisture from concrete
- Materials used [3]:
- silicon organic solutions
- resins
- oils
- Sealers
- Heavy barrier against penetrating solutions but may hinder the escape of internal moisture
- Materials used [3]:
- epoxy resins (EP)
- polyurethane resins (PU)
- unsaturated polyester resins (UP)
- Coatings
- compared to sealers, they provide additional protection against mechanical influence.
- increased resistance to diffusion of internal moisture
- Materials used [3]:
- plastic modified cement systems and resins