While this isn’t as big of a concern outdoors where there is ample ventilation, it still presents a health hazard. Health concerns associated with black mold are more of an issue when black mold forms inside homes where the mold spores become concentrated in the air and can more easily be inhaled by residents. Is Black Mold Dangerous?īlack mold can cause serious respiratory and even pulmonary health problems in people and pets, which is why most homes are inspected for mold before being sold. While water-based stains may not have chemicals that promote mold growth, they aren’t as durable as oil-based stains and can cause black mold to grow as the stain wears and fails. Cheaper stains that don’t have an algaecide can promote black mold growth on a deck. For this reason, most oil-based stains include algaecides to prevent this from happening. Oil-based stains have additives that can promote the growth of molds. Once trapped in the stain, these contaminants can breed mold, resulting in black mold growth.Ĭertain oil-based stains can also cause mold growth. Too thick a layer of deck stain can increase a 24-hour drying time to several days, giving contaminants such as tree pollen and dirt to end up in the stain. Over-applying deck stain is one common cause. There are a variety of reasons why black mold might be taking up residence on your deck. Shaded decks take longer to dry out after the rain, making them more susceptible to black mold growth. If the wood in these climates isn’t adequately treated with sealer and regularly cleaned, black mold will eventually grow on the boards.īlack mold is also common with decks in wooded areas that see little direct sunlight. Why Is Black Mold Growing on My Deck?īlack mold is most common in hot and humid climates where the deck wood is often moist. In addition to being unsightly, black mold can cause serious respiratory problems, which is why it typically requires professionals to perform mold removal or mitigation when found on a home’s interior. Because black mold requires a significant amount of water to grow, it generally exists in places that are always wet. How to Remove Mold From Composite Deckingīlack mold, or Stachybotrys chartarum, is a micro fungus that grows on material with high cellulose content, including fiberboard, gypsum board, and lumber.How to Remove Mold From Stained or Painted Wood.How to Remove Black Mold From Wood Deck.
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