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Flashing membranes play a critical role in the construction industry. Available in many sizes and forms, all flashing membranes serve the same purpose: preserving the integrity of a structure by preventing water penetration and providing an extra layer of protection against mold, mildew, and rot. Commonly, you may see flashings in the form of flexible peel-and-stick tapes, liquid flashings, or rigid flashings. Two of the most notable types of peel-and-stick membranes today are SBS (styrene butadiene styrene) modified bitumen and butyl-based. Let's examine the differences between these two types.