Fundamentals of Flashing Tapes

There are three primary adhesive technologies used in most, current product offerings: asphalt, butyl and acrylic. There are also a few newly developed technologies beginning to surface, but availability is limited, and long-term performance and installation feedback are still being evaluated.

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Asphalt is the oldest technology of the three offerings. Its most notable limitations are initial adhesion, compatibility issues with some sealants and cold-temperature application with a more limited range of approximately 40F (4C) - 120F (49C). This is often used in southern regions of the United States where fewer days of extreme cold weather and less than average annual rainfall are experienced. It once had a cost advantage, but as other adhesive technologies have become more mainstream, the savings gap has decreased significantly over time.

Acrylic offers very strong initial tack and adhesion to a wide variety of substrates. It can, however, be very unforgiving to both novice and experienced installer alike because of it tenacious adhesion its tolerance for repositioning after contact to the surface is very low. It has an extremely wide application and service temperature range, 0F (-40C) to 120F (80C) and -40F (-18C) to 240F (49C) respectfully, making it good for extreme temperature applications.

Butyl is currently the most common adhesive technology used in flashing tape products because it offers an optimal combination of performance attributes and cost benefits. It can be applied on most substrates ' including masonry and brick. Depending on the exact formulation, you may need to enhance the strength of the bond under certain circumstances with use of a spray adhesive. It can be applied easily in temperatures as low as 20F and as high as 120F. Butyl will provide outstanding "self-healing" performance to seal around fastener penetrations made during the window or door install process. When combined with a poly-based facer, you're install will benefit from optimal protection. While butyl formulations can vary a bit, they all generally provide good initial tack with some forgiveness ' enabling installer to reposition or adjust during the install process.

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