Black Decking and Joist Flashing Tape 152mm x 15.2m

This black bitumen-style flashing tape provides a robust waterproof barrier designed to protect timber structures from moisture ingress. It is engineered for homeowners and professional contractors who need to safeguard the hidden components of a wooden deck. The material features a solvent-free acrylic adhesive that remains stable during heavy rainfall. Because it is odourless, it is a practical choice for any outdoor project. This durable tape prevents rot by stopping water from sitting against the wood grain.

You should apply this tape to the top of deck joists, stair stringers, posts, and ledger boards to extend their lifespan. It is particularly effective on residential garden decks and commercial walkways where timber is exposed to the damp British winter. Whether you are building a new patio area or maintaining an existing ramp near a swimming pool, sealing the joists is vital. By covering these structural elements, you prevent water from pooling in the grain, which helps avoid premature decay in high-moisture environments.

Application is straightforward due to the initially repositionable acrylic adhesive which allows for precise placement on clean timber. Before you begin, ensure all wooden surfaces are dry and free from debris or sawdust. You can apply the tape by hand or using a roller to ensure a firm bond. The self-wound design makes it easy to handle during installation. Once fixed, the tape maintains its seal even after you drive nails or screws through it.

Each roll measures 152mm in width and provides a total length of 15.2m. This specific size is ideal for standard joist widths found in most UK decking builds. The tape is UV-resistant and weather-resistant to withstand long-term exposure to the elements. It features a unique self-healing capability that closes the gap around fixings to maintain a continuous waterproof seal. The black finish blends seamlessly with dark treated timber.