In recent years, builders have been paying more attention to the importance of keeping water out of walls. News of construction-defect lawsuits in California, EIFS failures in North Carolina, and the "leaky condo" crisis in British Columbia have all driven home the point that leaking buildings can cause major headaches for builders. One result of the focus on waterproof walls is the growing use of peel-and-stick membranes and other types of flexible flashing.

The term "flexible flashing" is used to describe a broad category of nonmetallic flashings, including both peel-and-stick and nonstick flashings. Manufacturers have not yet agreed on a generic term for these products, which are referred to as self-adhering bituminous tapes, flashing tapes, waterproofing tapes, flexible window flashings...

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