For reflective, cool roofs that redirect heat away from the house, algae and moss growths can hamper their capability to deflect the solar, which might affect utility bills. Visually, moss, dust and algae growths on a roof can have a negative effect on perceived house worth and curb attraction. For instance, black algae streaks in your roof may trigger a potential homebuyer to assume that the roof would possibly need repair or substitute, when it only must be cleaned. A metal roof could have to be changed when it grows rusty and begins leaking.

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