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Collecting water from your roof

If you collect roof run-off in a tank and use it for drinking water, you’ll need to be careful about how you clean and maintain the roof. You’ll also need to steer clear of some roofing materials.

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When you’re washing the roof, disconnect the downpipes so you don’t send contaminated water into your tank.

Products not suitable for collecting drinking water are:

  • Any lead-based products.
  • Asbestos cement.
  • Wood treated with CCA (copper, chrome and arsenic) or LOSP (light organic solvent preservative).
  • Bituminous materials.

The following products need washing or weathering before they are suitable:

  • New, untreated cedar.
  • Newly applied acrylic roof paint.
  • Fibre cement products.

The following products can be used straight away (as long as they are clean):

  • Galvanised steel.
  • Clay tiles.
  • Factory-painted steel or tiles.
  • Zinc.
  • Stainless steel.
  • Mineral fibre asphalt.
  • Slate.
  • Butyl (although black butyl rubber will need regular maintenance and cleaning as it weathers).
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