Pitched Roofs

TUTORIAL 4:

PAINTING PITCHED ROOFS (TILE AND TIN)

Download PDF

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

  1. Ensure tiles to be painted are free of dirt and loose friable material by Allow to dry.
  2. Replace broken tiles if
  3. If algae are present, poison with Ushevu, see Ushevu data sheet.

Application Method

  1. 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.

  1. Patch all ridging with FlashPatch Exterior or AcryLatex and Allow to dry.
  2. 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

  1. 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.
  2. 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”.

  1. Wash roof down with water and a broom to remove any dirt, dust or chalking Allow to dry
  2. 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

  1. 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.
  2. Patch all ridging with FlashPatch or AcryLatex and Allow to dry.
  3. 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

  1. Ensure roof to be painted is free of loose friable Allow to dry.
  2. Degrease new galvanised iron using GrimeReaper

Application Method

  1. Apply 1 coat AllPrime Plus OR EnviroPrime directly to roof with a brush, roller or airless Allow to dry.
  2. 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

  1. 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.
  2. 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”.

  1. Wash the roof down to remove any dirt, dust or old chalking Allow to dry
  2. 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)
  3. 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).

  1. 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

  1. 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
Shopping Cart
0
    0
    Your Cart
    Your cart is emptyReturn to Shop