Flashing Tape is a self-adhesive, waterproofing tape used to seal joints, seams, and penetrations in building envelopes, such as around windows, doors, chimneys, vents, and roof terminations. Typically made from materials like butyl, asphalt, or rubberized or acrylic-backed membranes, it provides a durable barrier against water ingress and air leakage.

One of its key benefits is its flexibility and high adhesiveness, allowing it to conform to irregular or contoured surfaces and seal around fasteners without tearing—no need for additional lubricants or fasteners. The tape performs reliably across a wide temperature range (from subfreezing to over 200 °F), and many modern formulations offer excellent UV resistance, making it suitable for both interior and exterior applications. It enhances overall building durability by protecting structural elements such as deck joists and preventing wood rot, while also improving energy efficiency by reducing drafts. Its simple “cut-and-stick” installation makes it accessible for professionals and DIYers alike, cutting labor time significantly compared to traditional flashing materials. Available in various widths to suit different applications, flashing tape ensures a long-lasting, weatherproof seal that supports the structural integrity and longevity of buildings.