Painting your roof?
STEP 1: WHICH TYPE OF ROOF DO YOU HAVE?
FIBRE CEMENT ROOF
SURFACE PREPARATION:
Fibre Cement and other Cement Surfaces (new):
- To remove dust, debris and chalky residue from the roof tiles, wash the entire roof area using a high pressure cleaner, using a rotating nozzle at a pressure between 150 and 200 Bar.
- Alternatively, scrub the entire roof area with a bristle brush, using water from a garden hose and allow the roof tiles to dry.
Fibre Cement Roof Tile and other Cement Surfaces (weathered, unpainted):
- To remove dust, debris and chalky residue from the roof tiles, wash the entire roof area using a high pressure cleaner, using a rotating nozzle at a pressure between 150 and 200 Bar.
- Alternatively, scrub the entire roof area with a bristle brush, using water from a garden hose and allow the roof tiles to dry.
- Old, weathered fibre cement is porous and may encourage the growth of fungus. Scrub these areas with either of the following solutions: 25% chlorine solution and water or 25% sodium hypochlorite and water solution. Rinse off thoroughly, removing residues of the cleaning solution, and at the same time cleaning off dust and debris from the roof.
APPLICATION:
- For sound cement roof tiles; prime with one coat Dulux Roofguard, thinned up to 10% with water to aid absorption followed by 2 undiluted coats of Dulux Roofguard
- For very porous/slightly friable/chalky cement tiles and all fibre cement tiles; prime with Dulux Bonding Liquid or Dulux Trade Bonding Liquid and overcoat within 48hours with 2 coats with Dulux Roofguard.
- Waterproofing. Where required apply at least three coats Dulux Rainshield over the primer coat, recommended minimum waterproofing dry film thickness of 1000μm. Overcoat with 2 coats Dulux Roofguard.
GALVANISED ROOF & CLADDING
SURFACE PREPARATION:
Galvanised Iron (new, unweathered):
- Heavy fabricator’s pre-treatment must be removed with Dulux Galvanised Iron Cleaner.
A water-break free surface indicates thorough cleaning – running water should not form droplets.
Galvanised Iron (unpainted, weathered):
- Remove all loose rust and white scale by means of wire brushing, sanding, chipping, or mechanical scouring – down to bright metal. To remove dirt, salts and zinc corrosion (white rust) clean thoroughly with Dulux Galvanised Iron Cleaner achieving a water-break free surface.
- Areas showing red rust must be removed back to bright galvanised iron spot primed.
APPLICATION:
Apply Dulux Galvanised Iron Primer, at a spreading rate of 5-10m² per litre with 4 hours drying time between coats, to entire substrate.
Finish with 2 coats of Dulux Roofguard at 7-8m² per litre with 4 hours drying time between coats.
CONCRETE ROOF
SURFACE PREPARATION:
- Before painting can commence, every problem must be repaired in strict accordance with DULUX BEST PAINTING PRACTICE.
APPLICATION:
Apply Dulux Trade Bituminous Aluminium Paint at 8-10m² per litre with 18 hours drying time between coats.
Finish with an additional coat of Dulux Trade Bituminous Aluminium Paint to ensure saturation of the substrate.
Spreading rates and minimum drying times are to be observed.
REDEC GALVANISED ROOF
SURFACE PREPARATION:
Galvanised Iron (new, unweathered):
- Heavy fabricator’s pre-treatment must be removed with Dulux Galvanised Iron Cleaner.
A water-break free surface indicates thorough cleaning – running water should not form droplets.
Galvanised Iron (unpainted, weathered):
- Remove all loose rust and white scale by means of wire brushing, sanding, chipping, or mechanical scouring – down to bright metal. To remove dirt, salts and zinc corrosion (white rust) clean thoroughly with Dulux Galvanised Iron Cleaner achieving a water-break free surface.
- Areas showing red rust must be removed back to bright galvanised iron spot primed.
APPLICATION:
Apply two coats Dulux Rustshield Anit Rust Metal Primer, at a spreading rate of 12m² per litre with 4 hours drying time between coats, to all exposed galvanised iron. Please note: Spreading rate depends on surface porosity, profile and application method.
Thinning not recommended. Ready for use after thorough stirring. Potable water if required for spraying to maximum of 5% of product volume. *Note if diluted multiple coats will be required to achieve the required minimum 60µm total dry film thickness.
Dulux Rustshield Anti Rust Metal Primer is not designed to withstand natural weathering. Overcoat within one week particularly in a coastal atmosphere.
Finish with 2 coats of Dulux Roofguard at 7-8m² per litre with 4 hours drying time between coats.
