wall and roof coatings

PAINTING PITCHED ROOFS

Determining your product requirements
Measure area to which paint is to be applied. Depending on surface to which the product is to be applied, determine which products are needed. (Refer to Product Specifier Tool) Check the Theoretical Spread Rates (TSR) on each of the specified products and see how many coats of each are recommended, then calculate what quantities of each product you will require, remembering to make adjustments for the porosity of each surface. TSRs are based on products applied to smooth, sealed surfaces. (e.g. an unsealed scratch plaster surface will absorb more paint than a sealed smooth one, so allow for a lower spread rate). Check out the specifications on all the top coat choices (referring to the relevant data sheets) and decide which is right for you. TSR = Theoretical Spread Rate | NC = Number of Coats | DT = Drying Time
Tiled Roofs - Unpainted
If Unpainted Tile Roof Surface Preparation Ensure tiles to be painted are free of loose friable material by washing. Allow to dry. Replace broken tiles If algae is present, poison with Ushevu as per Ushevu Description and Application Data Sheet Application Method Apply 1 coat AcrySeal directly to roof with a brush, roller or airless spray. (Rough tiles diluted AcrySeal 1 litre to 0.5 litre water, Smooth tiles diluted 1:1 with water). Allow to dry. Patch all ridging with FlashPatch or AcryLatex and cement. Allow to dry. (See AcryLatex Description and Application Data Sheet) Apply 2 coats undiluted RuvAcryl directly to roof with a brush, roller or airless spray. Allow to dry. Related Paintcor Products TSR = Theoretical Spread Rate | NC = Number of Coats | DT = Drying Time Undercoat / Preparation Ushevu - TSR: 20m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 24 hours AcrySeal - TSR: 10 - 15m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes FlashPatch - TSR: 10 - 15m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes AcryLatex - TSR: N/A | NC: N/A | AM: Brush, Roller or Spray | DT: @ 25°C – 7 Days when combined with cement mix | Dillution: 1:1 with water Top Coat Choices RuvAcryl - TSR: 8m² per litre | NC: 2 Coats | AM: Brush, Roller or Spray | DT: @ 25°C ±30 minutes
Tiled Roof - Previously Painted
If previously painted tile roof. Surface Preparation Check adhesion of existing paint system. (Cross hatch adhesion test). Using a Stanley knife, cut through the paint surface to the substrate vertically and horizontally approximately 3mm apart, creating little squares. If the edges of the squares curl up, and the square can easily be removed, this means the adhesion of the old paint system is failing. If the paint system is failing, remove all old paint back to the existing tile. If the old paint’s adhesion is still good wash roof down to remove any dirt , dust or old chalking paint. Allow to dry Treat for algae if necessary with Ushevu Algae Killer. Dilute 1litre Ushevu to 19 litres water, apply to algae and leave for 24 hours, then remove dead algae and Ushevu by washing down with water and allow to dry. Application Method Apply 1 coat AcrySeal to tiles if chalking paint has been washed off the exposed tiles, diluted 1:1 with water. Allow to dry. If the old paint is clean with no chalk on it then it is not necessary to apply AcrySeal before painting Patch all ridging with FlashPatch or AcryLatex and cement. Allow to dry (see product related Description and Application Data Sheet) Apply 2 coats undiluted RuvAcryl directly to roof with a brush, roller or airless spray. Allow to dry between coats. Related Paintcor Products TSR = Theoretical Spread Rate | NC = Number of Coats | DT = Drying Time Undercoat / Preparation Ushevu - TSR: 20m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 24 hours AcrySeal - TSR: 10 - 15m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes FlashPatch - TSR: 10 - 15m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes AcryLatex - TSR: N/A | NC: N/A | AM: Brush, Roller or Spray | DT: @ 25°C – 7 Days when combined with cement mix | Dillution: 1:1 with water Top Coat Choices RuvAcryl - TSR: 8m² per litre | NC: 2 Coats | AM: Brush, Roller or Spray | DT: @ 25°C ±30 minutes
Galvanized Iron Roofs - Unpainted
If galvanized iron roof is unpainted Surface Preparation Ensure roof to be painted is free of any contaminants by washing and degreasing with GrimeReaper rinse well and allow to dry. Remove rust, if any back to bright metal using sandpaper and remove sanding dust. Application Method Apply 1 coat AllPrime to areas where rust has been removed. Allow to dry. Now apply 1 coat AllPrime to the entire roof and allow to dry. This means that areas where dust has been removed, will be covered by 2 coats of AllPrime. Finally apply 2 coats RuvAcryl to the roof with a brush, roller or airless spray. Allow to dry. Related Paintcor Products TSR = Theoretical Spread Rate | NC = Number of Coats | DT = Drying Time Undercoat / Preparation AllPrime - TSR: Primed Steel: 12m² per litre | NC: Mild Steel: 2 Coats. Rust free Galvanized Iron: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes Top Coat Choices RuvAcryl - TSR: 8m² per litre | NC: 2 Coats | AM: Brush, Roller or Spray | DT: @ 25°C ±30 minutes
Galvanized Iron Roofs - Previously Painted (Peeling Paint)
If galvanized iron roof is previously painted and peeling paint. Surface Preparation Check adhesion of existing paint system. (Cross hatch adhesion test). Using a Stanley knife, cut through the paint surface to the substrate vertically and horizontally approximately 3mm apart, creating little squares. If the edges of the squares curl up, and the square can easily be removed, this means the adhesion of the old paint system is failing. If the paint system is failing, remove all old paint back to galvanized metal. If the adhesion of the old paint system is still good wash roof down to remove any dirt , dust or old chalking paint. Allow to dry Treat for algae if necessary with Ushevu Algae Killer. Dilute 1litre Ushevu to 19 litres water, apply to algae and leave for 24 hours. Wash the entire area down with water to remove dead algae and Ushevu and allow to dry. If there is any rust using sandpaper sand down these areas to bright metal and remove sanding dust. Application Method Apply 1 coat AllPrime to areas where rust has been removed. Allow to dry. Apply 1 coat AllPrime directly to the entire roof with a brush, roller or airless spray. This means that rusted areas will have 2 coats of AllPrime. Allow to dry. Apply 2 coats RuvAcryl directly to roof with a brush, roller or airless spray. Allow to dry. Related Paintcor Products TSR = Theoretical Spread Rate | NC = Number of Coats | DT = Drying Time Undercoat / Preparation AllPrime - TSR: Primed Steel: 12m² per litre | NC: Mild Steel: 2 Coats. Rust free Galvanized Iron: 1 coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes Ushevu - TSR: 20m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 24 hours Top Coat Choices RuvAcryl - TSR: 8m² per litre | NC: 2 Coats | AM: Brush, Roller or Spray | DT: @ 25°C ±30 minutes
Galvanized Iron Roofs - Previously Painted (Old paint adhesion still good)
If Previously Painted Galvanized Iron Roof and old paint adhesion is still good. Surface Preparation Wash roof down to remove any dirt , dust or old chalking paint. Allow to dry Treat for algae if necessary with Ushevu Algae Killer. Dilute 1litre Ushevu to 19 litres water, apply to algae and leave for 24 hours, then remove dead algae. Should there still be trace of chalk on the surface of the old paint after washing, then apply 1 coat AcrySeal diluted 1:1 with water. Allow to dry. If the old paint system is clean with no chalk then AcrySeal is not required before painting. Application Method Apply 2 coats Ruvacryl over sealer or over cleaned old paint. Allow to dry between coats. Related Paintcor Products TSR = Theoretical Spread Rate | NC = Number of Coats | DT = Drying Time Undercoat / Preparation AcrySeal - TSR: 10 - 15m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 30 minutes Ushevu - TSR: 20m² per litre | NC: 1 Coat | AM: Brush, Roller or Spray | DT: @ 25°C – 24 hours Top Coat Choices RuvAcryl - TSR: 8m² per litre | NC: 2 Coats | AM: Brush, Roller or Spray | DT: @ 25°C ±30 minutes
Pitched Roofs Tutorial - PDF Document
Entire Tutorial covering all Surface Preparation and Application Methods and Related Paintcor Products for Painting Pitched Roofs - Painting Pitched Roofs - PDF - (2.5M)
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