TUTORIAL 4:
PAINTING PITCHED ROOFS (TILE AND TIN)
Determining your product requirement:
- Measure the surface area you wish to
- Determine which products are needed for the roof surface you wish to paint.
- 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 for each surface. TSRs are based on products applied to smooth, sealed (E.g. an unsealed clay tile will absorb more paint than an unsealed smooth tin roof, so allow for a lower spread rate on porous surfaces).
- Check out the specifications on all the top coat choices (referring to the relevant data sheets) and decide which is right for
TILE ROOFS UNPAINTED TILE ROOF
Surface Preparation
- Ensure tiles to be painted are free of dirt and loose friable material by Allow to dry.
- Replace broken tiles if
- If algae are present, poison with Ushevu, see Ushevu data sheet.
Application Method
- Apply 1 coat AcrySeal directly to roof tiles with a brush, roller or airless (For Rough tiles: Apply 1 coat
AcrySeal diluted 1:0.5 litre water, Smooth tiles diluted 1:1 with water). Allow to dry.
- Patch all ridging with FlashPatch Exterior or AcryLatex and Allow to dry.
- Apply 2 coats undiluted RuvAcryl directly to roof tiles with a brush, roller or airless Allow to dry.
A roof experiences extremely high amounts of UV exposure, because of this it is vital to apply the correct film build for longevity. RuvAcryl must be applied at 8 square per litre, this will provide a film build of 80 microns dry film on 2 coats. A 3rd coat may be required to achieve the correct film build. Paintcor’s guarantee will be made null and void should the film build be below 80-micron dry film.
Relevant Product Information
| Ushevu | |
| Theoretical Spread Rate | 20m² per litre |
| No. of Coats required | 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 24 hours |
| AcrySeal | |
| Theoretical Spread Rate | 10-15m² per litre |
| No. of Coats required | 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 45 minutes |
| FlashPatch | |
| Theoretical Spread Rate | 10m² per litre |
| No. of Coats required | N/A |
| Application Method | Trowel or Scraper |
| Drying Time | @ 25°C – 1 hour |
| RuvAcryl | |
| Theoretical Spread Rate | 8m² per litre |
| No. of Coats required | 2 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
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 existing tile.
- Rub the old paint with your finger tip, if the colour of the roof is left on your finger, the coating is starting to
break down and “chalk”.
- Wash roof down with water and a broom to remove any dirt, dust or chalking 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 (brown) algae with a stiff bristle
Application Method
- If there are any areas that have peeled and bare roof tile is exposed, or if “chalking” paint was observed during the surface prep stage, then apply 1 coat AcrySeal diluted 1:1 with water to all roof tiles to be Allow to dry. If the old paint is clean and no “chalk” was observed, then it is not necessary to apply AcrySeal before painting.
- Patch all ridging with FlashPatch or AcryLatex and Allow to dry.
- Apply 2 coats undiluted RuvAcryl directly to roof with a brush, roller or airless Allow to dry
A roof experiences extremely high amounts of UV exposure, because of this it is vital to apply the correct film build for longevity. RuvAcryl must be applied at 8 square per litre, this will provide a film build of 80 microns dry film on 2 coats. A 3rd coat may be required to achieve the correct film build. Paintcor’s guarantee will be made null and void should the film build be below 80-micron dry film.
Relevant Product Information
| Ushevu | |
| Theoretical Spread Rate | 20m² per litre |
| No. of Coats required | 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 24 hours |
| AcrySeal | |
| Theoretical Spread Rate | 10-15m² per litre |
| No. of Coats required | 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 45 minutes |
| FlashPatch | |
| Theoretical Spread Rate | 10m² per litre |
| No. of Coats required | N/A |
| Application Method | Trowel or Scraper |
| Drying Time | @ 25°C – 1 hour |
| AcryLatex | |
| Theoretical Spread Rate | N/A |
| N/A | N/A |
| Application Method | Brush, Roller or Spray |
| Drying Time | 1:1 with water |
| RuvAcryl | |
| Theoretical Spread Rate | 8m² per litre |
| No. of Coats required | 2 coats |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
TIN ROOFS
UNPAINTED TIN ROOFS
Surface Preparation
- Ensure roof to be painted is free of loose friable Allow to dry.
- Degrease new galvanised iron using GrimeReaper
Application Method
- Apply 1 coat AllPrime Plus OR EnviroPrime directly to roof with a brush, roller or airless Allow to dry.
- Apply 2 coats RuvAcryl directly to roof with a brush, roller or airless Allow to dry.
NOTE: Should you wish to paint your tin roof white, then Elegance Silk White must be used. Studies have shown that painting a tin roof with white instead of black or charcoal can reduce the surface temperature of the roof by up to 30 degrees Celsius.
A roof experiences extremely high amounts of UV exposure, because of this it is vital to apply the correct film build for longevity. RuvAcryl must be applied at 8 square per litre, this will provide a film build of 80 microns dry film on 2 coats. A 3rd coat may be required to achieve the correct film build. Paintcor’s guarantee will be made null and void should the film build be below 80-micron dry film.
Relevant Product Information
| AllPrime Plus | |
| Theoretical Spread Rate | Primed Steel: 10m² per litre |
| No. of Coats required | Mild Steel: 1 coat |
| Rust free Galvanised Iron: 1 coat | |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
OR
| EnviroPrime | |
| Theoretical Spread Rate | Primed Steel: 12m² per litre |
| No. of Coats required | Mild Steel: 2 coats |
| Rust free Galvanised Iron: 1 coat | |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
| RuvAcryl | |
| Theoretical Spread Rate | 8-10m² per litre |
| No. of Coats required | 2 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
PREVIOUSLY PAINTED TIN TOOF
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 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 existing tile.
- Rub the old paint with your finger tip, if the colour of the roof is left on your finger, the coating is starting to
break down and “chalk”.
- Wash the roof down to remove any dirt, dust or old chalking Allow to dry
- Check for spot rusting, sand rusted areas back to bright metal and spot prime with Paintcor’s AllPrime Plus, OR prime with Paintcor’s Ruscon over rusted areas only, allow to dry, then spot prime with Paintcor’s EnviroPrime. (Check relevant product data sheets)
- Treat for algae if necessary, with Ushevu Algae Dilute 1litre Ushevu to 19 litres water, apply to
Algae by mechanical force (use a broom or brush) and leave for 24 hours, then remove dead algae (broom).
- 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 AcrySeal or over cleaned old Allow to dry between coats.
NOTE: Should you wish to paint your tin roof white, then Elegance Silk White must be used. Studies have shown that painting a tin roof with white instead of black or charcoal can reduce the surface temperature of the roof by up to 30 degrees Celsius.
A roof experiences extremely high amounts of UV exposure, because of this it is vital to apply the correct film build for longevity. RuvAcryl must be applied at 8 square per litre, this will provide a film build of 80 microns dry film on 2 coats. A 3rd coat may be required to achieve the correct film build. Paintcor’s guarantee will be made null and void should the film build be below 80-micron dry film.
Relevant Product Information
| AllPrime Plus | |
| Theoretical Spread Rate | Primed Steel: 10m² per litre |
| No. of Coats required | Mild Steel: 1 coat |
| Rust free Galvanised Iron: 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
OR
| EnviroPrime | |
| Theoretical Spread Rate | Primed Steel: 12m² per litre |
| No. of Coats required | Mild Steel: 2 coats |
| Rust free Galvanised Iron: 1 coat | |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
| RuvAcryl | |
| Theoretical Spread Rate | 8-10m² per litre |
| No. of Coats required | 2 coats |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 60 minutes |
| AcrySeal | |
| Theoretical Spread Rate | 10-15m² per litre |
| No. of Coats required | 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 45 minutes |
| Ushevu | |
| Theoretical Spread Rate | 20m² per litre |
| No. of Coats required | 1 coat |
| Application Method | Brush, Roller or Spray |
| Drying Time | @ 25°C – 24 hours |
