SIGA Majvest 500 SA


Eliminate fasteners and Elevate the air-sealing
Performance & Wind-load resistance of your WRB.



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SIGA Majvest 500 SA is a vapor-permeable, 3-ply membrane, with the reverse face fully coated by a pressure-sensitive glue for direct bonding to substrates. The adhesive side of the sheet is protected by a white, siliconized, split-release liner which is removed during installation. Primer-free adhesion to most common building materials, including concrete, plywood, gypsum, and metal.

Wide 60” roll size, for efficient area coverage in above-grade wall applications.

Narrower 18” roll size, for use in construction sequencing, pre-stripping, and smaller sections of the wall field in above-grade wall applications.


18″, 60″

Length per roll: 100 ft.


  • high adhesive strength at high and low temperatures
    sticks in all seasons, long-term building value
  • no primer required
    fast and clean application, saves time
  • tear-resistant release liner with a 50/50 split
    easy to remove, saves time


SIGA Majvest 500 SA System Guidelines

Ultimate Guide to Window Flashing

SIGA Manual US

Majvest 500 SA System Guidelines

Majvest 500 SA Technical Data Sheet

Majvest 500 SA – Material Safety Data Sheet



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