How to Apply a Roof Membrane to Metal Roof Surface

Are you wondering how to apply a roof membrane to a metal roof surface?

In our latest blog we walk you through the entire process, including:

• • • Cleaning a metal roof,
  • • Treating a rusted roof, and finally
  • Applying the roof coatings

If you need further advice after reading this article, please reach out to Globalcote’s coatings experts on 1300 928 826.

Preparing a Metal Roof for Painting

Preparing your surface for coating is such an important part of the process, because if it’s not done properly your coating might not adhere correctly.

As with all other surfaces, a metal roof must be clean and sound before a roof membrane can be applied.

Cleaning a Metal Roof

The first step is making sure your metal roof is clean.

We recommend using a high-pressure cleaner at a minimum of 3000-psi to wash the surface down.

For a thorough clean, we also have product called Globalcote Roof Wash, which can be applied at a spread rate of 8m2 per litre with a garden pump up sprayer or airless spray gun. Heavily soiled, painted surfaces may require brushing with a soft-bristled broom to remove  ground-in dirt and/or contaminates.  Wash the area throughly with water, ensuring no residue remains.

Warning: To avoid damage, due care should be taken on previously painted surfaces when using a pressure cleaner.

If your roof has been painted previously, any coating that is loose, flaking or blistered needs to be removed.

Treatment for rusted roof

Is your roof rusty? To achieve a sound surface, it’s vital to remove rust and scale with a wired brush or mechanical abrasion.

We recommend using Globalcote Rust Converter to treat affected areas.

• • • Brush onto rusty surface at spread rate of 8-10m2/L (Amount depends on profile)
  • • Let the rust converter sit on the surface for between 5 – 10 minutes
  • Rinse the surface thoroughly before the treatment has time to dry

Do you have rusty screws in your roof? Make sure they are replaced and suitably primed before you go any further.

Painting a Metal Roof

• • • Step 1 – Seal the surface:
      • • • Surfaces without rust:
            • • Coat the whole roof area with Primecote Sealer Primer at a spread rate of 10m2 per litre.

        • Surfaces with rust which have been converted:
          • • • If your roof has rusted areas which have been converted with our rust converter, you need to use Primecote Metal to prime the area.
            • •  The spread rate is 6m2 per litre.
            • Rust converted areas need two (2) coats of Primecote Metal.

  • • Step 2 – Apply 1^st coat:
      • • • You are now ready to apply your 1^st coat of Globalcote Roof Membrane – Infracote or Elastacote
        • Stick to a spread rate of 5m2 per litre

  • Step 3 – Apply 2^nd coat:
    • • Apply your second coating of your Globalcote Roof Membrane.

This coating is also applied at a spread rate of 5m2 per litre

If you need further advice about painting metal roof surfaces, or any of our products, please reach out to us today by calling 1300 928 826.

Globalcote is fast becoming a leader in the manufacture of specialty acrylic exterior coatings. We have an extensive product range available is a wide variety of colours. 

Our product range includes roof membranes (some with heat reflective properties), primers and sealers, surface treatments,  interior/exterior house paint and pool paints. 

We have an enviable reputation trusted amongst professional tradespeople and paint retailers Australia wide and supply a wide network of retail stores throughout Australia. 

For an Australian owned and operated company thinking globally and acting locally, call Globalcote on 1300 928 826.