JLC explores SIGA’s one-way vapor barrier: Majrex

As building science continues to improve, the world of vapor barrier and control options is getting more and more complex.

Ted Cushman from the Journal of Light Construction spent a day with SIGA to talk vapor barriers to help add clarity to the topic. We spent most of our time talking about the Majrex.

The Majrex is a one-way vapor barrier that adjusts to variable humidity. In contrast to competitor products, Majrex has a greater moisture permeability in one direction than in the other.

As a result, it offers protective power for buildings under construction. Moisture evaporating out of concrete or drywall can stress a building early in its life. In that situation other variable-permeability membranes may open up and expose the structure to indoor moisture.

To read Ted’s account of the SIGA Majrex, click here to open the Journal of Light Construction’s article.