Case 4
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Good Practices
Design
- The use of full tiling height should be recommended so as to reduce the use of paints.
- Good ventilation of wet areas is necessary to keep the place dry and remove excess moisture. With dry conditions, the growth of fungi will be inhibited.
- SS CP13 recommends a minimum of 10 air changes per hour.
- BS 5270 (1979) recommends
Paint
Material
Use of a paint system, which allows moisture to pass through the coating to reduce the moisture pressure is another alternative to minimize paint defects caused by moisture [1-7].
Construction
Prior to the application or re-application of paint system, surface condition should be checked. Surface condition for painting process should be as follows[7-9]:
- Check the moisture of the substrate . The moisture content should not be more than 6%.
- Remove all loose and foreign particles by manual cleaning with scraping.
- Grind surface imperfections and rinse with clean water and wipe dry.
For old surface, the preparation required will depend upon the condition of the surface. If it is clean, dry, and sound it will require no special preparation. However, if the surface is powdery or there is other evidence of old distemper residue, it should be dusted off and sealed with a stabilizing solution.
For the painted surfaces, the existing paintwork should be washed down first. This is necessary to remove traces of dirt and grease, which would otherwise cause failure of subsequent decoration.
Quality Control
Skilled labour and greater supervision on site can enhance the quality of workmanship. A checklist can be used to inspect the workmanship quality.