You can tell when a roof hasn’t been cleaned for a couple of years – algae, moss and debris build up and make the whole property look unsightly. And if left untreated, this can even lead to damage and rot.

It’s best to leave roof cleaning to the professionals for safety reasons. What does the cleaning involve?

The first step is to simply brush down the roof with a water and bleach mix – this kills algae and removes any debris. And to prevent it coming back, your roofer might insert zinc or copper strips to the roof’s shingles – whenever it rains, molecules from these metals will run down the roof and help prevent algae and moss from returning.