Majrex
Majrex is SIGA’s smart interior vapour control layer with directional moisture management: it restricts vapour entry into the assembly while allowing trapped moisture to escape inward. That one-way behaviour protects wood-frame walls and roofs through Canadian seasons. A Passive House favourite we stock with its matching tapes.
Made by SIGA
SIGA is a Swiss company providing products and education to help keep buildings air- and watertight. They are world leaders in innovative building design and testing, with the goal of improving global building and living standards, and they are a go-to for Passive House construction.
Where this product fits
- Stocked at or transferred between all six branches
- Volume pricing by the case or pallet
- Product specialists to confirm fit for your application
More SIGA air and vapour barrier products
Other options for the same job
These solve a similar problem a different way. Check the data sheet or ask your branch to confirm they suit your project.
Blueskin SA
Blueskin SA is the peel-and-stick air and vapour barrier membrane that defined the category in Canada.
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Protecto Wall VP
Protecto Wall VP is a vapour-permeable, self-adhered water-resistive air barrier that lets walls dry while keeping air and water out.
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Majvest 200
Majvest 200 is SIGA’s exterior wall membrane: a tough, vapour-permeable weather-resistive barrier engineered to Swiss airtightness standards.
View productChoosing an air barrier system? Tell us the wall assembly and exposure and a product specialist will help match compatible products.
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