What to know about the organics on your home

On your house, moss is bad for any building material, because it draws food from that material, breaking down its colour first, and etching progressively more deeply into the product. Worse still, it provides cover for fungus, which is much more destructive. Fungus is a powerful decomposer.

Lichen is a green algae-looking growth that spreads across roof tiles due to moisture and warmth. Without removing lichen, it will continue to spread and will cause damage to your roof tiles and home

Gloeocapsa magma is the algae that grows on composition shingles, causing unsightly streaks and stains. The amount of gloeocapsa magma on a rooftop is a common way in which people estimate the age and condition of a home's roof.

The number one cause of algae growth on siding is water. Humidity and excessive rain are ideal conditions for algae growth. Those conditions get even better if your home is on a shady lot and does not regularly get direct sunlight that can dry your home off.

Excessive moisture around your home exteriorMold on your siding thrives when the ground adjacent to your home is constantly wet. Poor drainage, a faulty gutter system, and leaky faucets can all contribute to water pooling around your foundation—which mold loves.