Weather-Resistant Deck Joist Tape Waterproof seal butyl joist tape with self-adhesive flashing for wood decks, beams and roofs. Protects joists from moisture and environmental exposure with a durable, weather resistant barrier. Deck Joists Butyl Tape Adhesive, waterproof deck beam tape that acts as a barrier for wood, joists, metal, plastic and rubber connections. Helps prevent water damage and corrosion, reducing moisture related damage to crossbeams. Suitable for indoor and outdoor use. Self-Adhesive Barrier Joist Tape Creates a waterproof barrier between metal and wood, stopping moisture from seeping through and causing rust or rot. Compatible with both treated and untreated lumber, guarding against water damage, rot and decay over time. User-Friendly Butyl Tape Easy to install and a labor-saving solution for deck or floor installation. Whether building a new deck or upgrading an existing one, this butyl deck tape provides effective waterproofing and protection. For best results install in dry, debris-free conditions. Use scenarios New deck construction Apply along joists and flashing to seal gaps, protect connections and extend deck life. Works with treated or untreated lumber and various materials. Deck or roof deck retrofit Upgrade existing decks, beams and flashing by applying the tape to critical joints to reduce moisture intrusion and prevent rot around joists and crossbeams. Indoor and outdoor projects Ideal for outdoor decks, outdoor stairs, roof joists and other wooden structures where moisture and corrosion protection are needed. Compatible with wood, metal, plastic and rubber components to provide a versatile waterproofing solution.