Emsworth’s coastal position keeps roof surfaces damper for longer than inland Hampshire — the salt-laden air off Chichester Harbour keeps the biofilm active through the winter months when inland roofs are frost-dried. The result: heavy black algae staining on south-west-facing slopes is much more common here than heavy moss. A proactive soft-wash every 5–6 years keeps most Emsworth properties looking sharp without needing major remedial work.
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