Mold is a general term used for fungal growth. It will grow on just about any exterior surface including decks. Wood is not naturally resistant to mold infiltration. Even pressure treated pine will get mold on it if the conditions are right. Most decks have seen their fair share of mold depending on climate, humidity, and sun exposure. Shaded areas of decks are typically more prone than sunny areas. Even some deck stains can be more prone to mold than others.
Mold and wood do not mix. Mold will win every time. Spore infiltration may be surface mold or it could go deeper into the wood fibers. Damage can range from unsightly appearance to major structural damage. The good news is that mold on decks can be removed safely before damage is done. Most decks should be cleaned and re-stained every year or two to keep a maintained appearance. Regular maintenance will increase the deck’s longevity. Knowing how to remove mold on decks does not include any big secrets. If you follow a general cleaning method you will remove mold in the process.