How does the tannin content in teak affect surrounding surfaces or decks?

Teak wood is highly valued for its durability and natural resistance to decay, making it a popular choice for outdoor decks and furniture. However, one of its notable characteristics is its high tannin content, which can affect surrounding surfaces. Tannins are natural organic compounds found in teak that can leach out when exposed to moisture, leading to staining on adjacent materials like concrete, lighter-colored wood, or fabrics.

When rainwater or humidity interacts with teak, tannins may dissolve and transfer to nearby surfaces, leaving dark brown or grayish stains. This is particularly common in new teak wood, as freshly cut or unsealed teak releases more tannins. Over time, exposure to sunlight and weathering reduces tannin leaching, but initial staining can be a concern for deck owners.

To minimize tannin-related staining, consider sealing teak with a protective finish or allowing it to weather naturally before installation. Regular cleaning with mild soap and water can also help remove surface tannins before they transfer. Understanding how tannins behave in teak ensures better maintenance and longevity for both the wood and surrounding surfaces.