We need to be cautious when softwashing man-made roofing slates.
Man-made roof slates often lose their coating over time, through natural weathering.
Cleaning the "biofilm" from roof slates may expose the fibre cement or other material the slate is made from, which, before softwashing, will have been covered over by organic growths.
Although the roofing slate may be structurally sound, the coating may not be. And this will become evident after the man-made tiles have been given a softwash treatment. So we need to make our customer aware of this possibility before we begin the softwash treatment.
The test patch in the photos below shows what can happen to very old slates
The photos below show man made slates that are only seven years old, proving that the coating on relatively new coated slates can also fail quickly.The roof was eventually re-painted by the manufacturer of the slates, as they carried a ten-year colour guarantee. The roof was not softwashed or pressure washed.
Organic growths can also damage a roof coating. The 17 second video below shows how the growths can bind with the coating, which in turn can damage the coating.
We recommend treating man-made roof slates with Benz Bio Cleanze, after manually removing the worst of the moss and lichen.
Bio Cleanze will "creep" up inside the laps better than other cleaning products, ensuring all the growths and spores are killed. In our experience this is the best way to give a softwash treatment to clean man-made roof slates.
Important: Always treat an out of the way test patch first and look for the tell-tale pitting of the tile coating before treating or cleaning the whole roof. Always obtain your customer's agreement that the results are acceptable and get their permission to treat the remaining roof surface.
We hope this information is helpful and inspires you to succeed in your softwashing business.
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