After years in a humid environments, mould, green and black algae, and fungi can start to grow on your roof. Fungi can have an especially detrimental effect on your roof. Unlike algae, a fungus does not rely on photosynthesis to produce its own food; as a result, it must feast on organic material that is found in many roofing materials including asphalt shingles. Indeed, tar is actually fossilized organic matter and the main source of nutrition for fungi.
One of the main concerns related to fungi and algae residing on your roof is the effect these organisms have on your roofing materials. Without question, as fungi consume the organic materials, your roof will deteriorate much more quickly. In fact, as the granules in your shingles are broken down, your roof even becomes more susceptible from damage by inclement weather and UV rays. Yet, even from a purely aesthetic perspective, black and green algae and fungus significantly diminish the value of your home.
Understandably then, removing algae and fungi is important, and roof cleaning is a process by which these organisms are removed. Roof cleaning can restore the appearance of your roof, while also extending the life of your roofing materials. Even as we move to fibreglass shingles, the risk of damage to your roof by fungi and algae is enhanced. Fibreglass shingles contain limestone which subsequently attracts bacteria, in addition to other causes of black streaks on your roof.