SIGA Majrex is a fiber-reinforced, modified PE/PP sheet designed as an interior air-barrier and vapor control membrane. With its unique and revolutionary Hygrobrid® technology, the diffusion resistance of Majrex varies depending on the direction of vapor flow. Interior water vapor is prevented from driving into the wall cavity (low permeance), while still being allowed to move in the other direction and dry-to-the-inside (high permeance). SIGA Majrex offers a high degree of protection against moisture damage, even in challenging flat roof and continuous insulation assemblies. When combined with compatible SIGA system components, SIGA Majrex also forms an effective air barrier against warm air convection (drafts and heat loss). Suitable for containment of injection insulation.
BUILT GREEN® Checklist
*This product can contribute to improved building envelope, and, used alongside other products and proper installation, can contribute to the following checklist item:
1.2.1 Install additional insulation on exterior of above-grade walls, above insulation amounts already required by code: add R5 for 2 points or R10 for 4 points.
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