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    A one-component elastomeric material for use as a flexible flashing membrane. It can also be used to prepare sheathing joints for subsequent application of Acrostop​​ air/water-resistive barrier membranes.

    ​Product Highlights

    • ​Can be applied to damp substrates

    • ​Withstands rainfall immediately after application

    • ​180 days UV exposure

    • ​Fast cure and tack-free time

    • ​Bonds to a wide range of substrates

    • ​Does not contain solvents, phthalates or isocyanates


    MaxFlash​​​ can be used as a membrane for flashing rough openings, small penetrations and as a detailing compound for preparing sheathing joints for application of an air/water-resistive barrier membrane. Acceptable substrates include poured concrete/unit masonry, ASTM C1177 sheathings including DensGlassTM exterior sheathing, DensElementTM, eXPTM sheathing, GlasRoc sheathing, SecurockTM glass-mat sheathing, Weather DefenseTM Platinum sheathing, GreenGlass sheathing, PermaBaseTM cement-board by National Gypsum and other cement-boards (ASTM C1325 Type A Exterior) Exposure 1 or exterior plywood sheathing (grade C-D or better), Exposure 1 OSB, gypsum sheathing (ASTM C79 / ASTM C1396) pressure or fire retardant treated wood, steel and aluminum.​


    MaxFlash Product Bulletin

    MaxFlash Liquid Flashing Membrane

    Materials Safety Data Sheets