What happens to timber decks when ventilation is blocked?
Here's the short answer:
When ventilation is blocked beneath a deck, gaps close up, moisture becomes trapped, and fungi get the perfect environment to thrive, leading to swelling boards, cupping, and decay. This can happen even to elevated or partially enclosed decks. FSA Network floor sanders always assess sub-deck airflow before sanding or coating deck surfaces.
That's the basics. Give us a call if you need more detail.
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