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    ​​​​​​​​​​​​​​​​​​​WS Flash and Flashing Primer

    WS Flash is a patented, 30-mil thick, self-sealing, self-healing composite membrane of polyester fabric and rubberized asphalt.

    WS Flash is compatible with Senergy Base Coats and Senershield-R/-RS/-VB.

    WS Flash is supplied in rolls, on release paper, for easy application.



    ​Self-sealing, self-healing

    ​Maintains a seal when penetrated by fasteners

    ​Senershield-R, Senershield-RS, Senershield-VB, and Senergy Base Coats can be applied to polyester face

    ​Use as part of adhesively applied EIFS

    ​Supplied in rolls on release paper

    ​Easy application


    • Used as an air/water-resistive barrier accessory to connect different air barrier materials or assemblies together to make the air/water-resistive barrier continuous.
    • Flashing at sills, approved sheathing joints, rough openings, and terminations.
    • As an expansion joint seal.
    • Flashing Primer is to be used under WS Flash membrane on these acceptable substrates and other surfaces
          • ​​​Wood framing (Note: Verify adhesion before applying to wood that has been treated in any way.)
          • ASTM C1177 sheathings; e.g. eXP™, GlasRoc®, Securock™ and DensGlass™​
          • Water-resistant core gypsum sheathing (ASTM C79/ASTM C1396)
          • Cement-board (ASTM C1325 Type A Exterior)
          • Masonry
          • Exposure 1 or exterior plywood sheathing
          • Exposure 1 OSB
          • Steel framing
          • WS Flash (itself)
          • Senershield Air/Water-Resistive Barriers​​


    • ​WS FLASH 4: 10.2 cm x 30.5 m (4" x 100'), 9 rolls per carton
    • WS FLASH 9: 22.9 cm x 30.5 m (9" x 100'), 4 rolls per carton


    • WS FLASH 4: 274.3 Lin m (900 Lin ft) per carton
    • WS FLASH 9: 121.9 Lin m (400 Lin ft) per carton
    WS Flash / Flashing Primer

    WS Flash / Flashing Primer Product Bulletin


    Material Safety Data Sheets