Why do dark stains appear in some places on roofs and not others?

Roofs, just like everything else that isn’t properly cared for, can fall into a state of disarray long before they’re supposed to. Premier Roof Clean aim to stop this from occurring by offering roof cleaning solutions that are not only effective, but long-lasting too. As one of the finest teams of roof cleaners Surrey has to give, we are the people to call if roofs ever require some attention.

If yours is a house that is positioned within one of the UK’s more humid locations, chances are that you have noticed darkened streaks on your roof. Even though this problem tends to be blamed on a gathering of dirt, mould, mildew, or defective materials, in truth, it’s actually the blue-green Gloeocapsa Magma algae, which is spread via spores in the air. There isn’t a great deal of danger to the structure, but if you’re looking to sell the algae isn’t exactly going to help you in attracting buyers.

Something else you may have perceived is that these stains aren’t showing up directly beneath the metal flashings present around your roof vents or chimneys. This is because the zinc and copper these products are made of is toxic to algae. Each time it rains, metal traces are washed down the roof and impede algae growth.

In terms of when to clean the stains, it should be done on a cloudy day so that the cleaning agents don’t evaporate too fast. They need to be given time to do their work and kill off the algae or traces may be left behind. This could result in stains returning quickly.

At Premier Roof Clean we make use of tried and tested cleaning methods whilst working on rooftops. Instead of pressure washing, which has proven itself somewhat inappropriate, we opt for a more manual approach that doesn’t put roofing materials at risk of deterioration. That way we clean the surface effectively without increasing the risk of causing further repair costs.

If your roof has seen better days, then it might be time to call on the professionals. We are home to the best roof cleaners Surrey has to offer so don’t hesitate to contact us to discuss your roofing.