Repainting roofs in poor condition

Resene Popular Paint Systems –
Roofing products and roof paint preparations: training notes

This web page is an edited version of the Resene Best System Selling training notes provided to Resene staff and is provided to enable you to gain a greater understanding of the substrates and paint systems you may encounter in your decorating project. It is impossible to cover all decorating scenarios in a single document, so if you are in doubt about any aspect of your project please contact Resene for assistance.

How to repaint roofs in poor condition

Note: Refer to the PDF flowchart for a visual of the steps below:

  1. Treat moss and mould with Resene Moss & Mould Killer

  2. Thoroughly scrub using Resene Roof Wash and Paint Cleaner and a hard bristled scrubbing brush. Alternatively wash down using a high pressure waterblaster.

  3. Scrape as necessary (see notes)

  4. Spot prime bare areas with Resene Galvo One

  5. Topcoat options:

Repainting roofs in poor condition

1 To optimise the benefits of the Resene Cool Colour topcoat use Resene Cool Primer

Things to consider:

  • What sort of roof do you have?
  • Is your roof painted?
  • How long ago?
  • What sort of condition is it in, any flaking or rust present?
  • Do you live close to the sea, say within 500 metres?
  • What colour do you have in mind?
  • Have you considered Resene Cool Colour paints?
  • What is the floor area of your house?
  • Is access to the roof likely to be a problem?


Roof Brush
Roof Brush
  • Often roofs with flaking paint will also be dirty and have some mould and lichen growth. Preparing them is likely to be time consuming and difficult to judge the level of preparation needed. A balance between removing the paint that is unsound and not damaging the roof must be found.

    This is why Resene recommend scrubbing with Resene Roof Wash and Paint Cleaner and a hard bristled brush to waterblasting

  • Hard wire brushing or sanding should be confined to the red rusting areas only. This will avoid damaging the protective galvanised layer, which will simply lead to more rusting.

  • The prepared area must be primed promptly. Do not leave overnight as dew causes the edges of the paint to lift and you will need to start over. Collect any removed paint and check that the gutters and downpipes are cleaned out.

Key accessories essential to complete the job

  • PAL corrugated roller kit (if painting corrugated iron)
  • Resene black 75-100mm brush for cutting in flashings and ends of sheets, Haydn Genius or PAL Legend if painting longrun on trough sections
  • Resene Hot Weather Additive
  • Resene Roof Wash and Paint Cleaner
  • Roller extension pole
  • Turps for Resene Galvo One

Add-ons – to make the job easier or quicker

  • Gloves
  • Hand cleaner
  • Paint pots (especially when 10 litre pails are bought)
  • Scraper to remove lichen
  • UV protection

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