Majrex

Product catalog summary

Introduction
Majrex® is a vapour control layer developed by SIGA using Hygrobrid® technology, inspired by the moisture transport mechanism of cacti. This technology allows for one-directional moisture transport, enhancing safety in building constructions.

Background and Development
Through extensive research, SIGA identified the cactus's ability to survive extreme conditions by allowing moisture to move in one direction. This principle was applied to create a vapour control layer that prevents moisture from re-entering the structure.

Challenges in Wood Constructions
Wood constructions without rear ventilation are prone to moisture issues due to drying screed, plaster, and construction moisture. Traditional variable vapour control layers have not effectively mitigated these risks, prompting SIGA to develop a safer alternative.

Technological Advancements
The Technical University of Dresden conducted tests confirming that SIGA-Majrex® with Hygrobrid® technology significantly reduces moisture development compared to conventional layers. It enhances moisture diffusion out of the structure, providing better safety even under high moisture conditions.

Calculation Method
Hygrothermal simulations, as per EN 15026: 2007 and WTA 6-2:2014, were used to assess vapour-proof wood constructions. IBK Engineering developed software to standardize calculations of directional diffusion resistances, mathematically proving Hygrobrid® technology's effectiveness.

Conclusion
Majrex® with Hygrobrid® technology offers a proven, safer solution for vapour control in construction, ensuring minimized moisture development and maximized moisture transport out of structures.

Catalog excerpts

® The safe vapour control layer – thanks to Hygrobrid t

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The safe vapour control layer – thanks to Hygrobrid technology Wood constructions without rear ventilation of the insulating layer are critical in terms of building physics. Structures frequently have no rear ventilation because of cost - or for aesthetic reasons. Moisture from drying screed and plaster as well as enclosed construction moisture can quickly become a problem. See hygrothermal simulations [EN 15026: 2007; WTA 6-2:2014] for externally vapour proof wood constructions without rear ventilation. IBK Engineering in Dresden (Germany) has developed the building physics software Delphin...

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