Green staining is almost always caused by algae growing on your home's exterior. in Erie, CO
Algae thrive in damp, shaded areas where moisture remains for longer periods. North-facing walls are especially prone to green buildup because they receive less direct sunlight throughout the day.
Simply spraying algae with water often provides only temporary improvement. The growth needs to be properly treated to prevent it from returning quickly.
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💡 Good to Know
If only one side of your house is green, it's usually because that side receives less sunlight—not because the siding is failing.
