York MaxSeal is a proprietary, self-adhering 14 mil composite membrane that provides a superior barrier to limit air and moisture transmission through masonry, curtain walls, construction joints and fittings, and around doors and windows. Composed of:

• Tough high density polypropylene film – forming a resilient barrier to physical damage
• Butyl adhesive – providing the waterproofing effectiveness of traditional modified bitumen products, while introducing a novel combination of low temperature adhesion, high temperature stability, and a much more aggressive adhesion level
• Easy to remove release liner – allowing for quick installation