Preparation for Overpainting
- Thoroughly clean the surface with fresh flowing water and a medium stiff nylon bristle broom, or water blast at 20 MPa. When cleaning the profile to remove dirt, lichen, mould, or algae, care should be taken not to drive water under laps or flashings. Detergent or proprietary roof wash may be added (if safe) to aid dirt removal, but if used should be flushed off with fresh water before drying.
- Rinse the profile thoroughly, as any remaining dirt will impair subsequent paint adhesion. Particular attention should be given to the drip edge (where the final 15 mm is prone to heavy dirt build-up), and to the coating at the front edge of tile profiles, as dirt collects in this area leading to mould, algae, and lichen growth.
- Fallout around flues and vents needs to be removed before painting.
- Allow the roof to dry.
Clause:
016_008_001_000_000_000_000_000_000
Clause Number:
16.8.1
/cop/maintenance/overpainting#preparation-overpainting
Revision Category:
4 - Clause Inserted
- Log in to post comments