Breathable Waterproof Membrane ELEKTRONIKSYSTEM I UMEÅ ELT-2 – vapor-permeable roofing and wall membrane

Breathable Waterproof Membrane ELEKTRONIKSYSTEM I UMEÅ ELT-2 – vapor-permeable roofing and wall membrane is designed for use in roofing underlays and external wall assemblies where water resistance and vapor permeability are required. The membrane limits liquid water penetration from the outside while allowing water vapor from the structure to pass through, reducing the risk of condensation and moisture accumulation in roof and facade constructions. It is suitable for ventilated roofs and as a protective layer behind external cladding.

Advantages

ELT-2 combines weather resistance with vapor permeability to provide a balanced building-envelope solution. The membrane helps protect structural elements from water ingress while enabling drying of trapped moisture by permitting vapor transmission. Its design supports installation as an underlay beneath roofing materials or behind facade cladding, contributing to longer service life of assemblies by reducing moisture-related deterioration.

Suitable for

• Ventilated pitched roofs as an underlay beneath shingles, tiles, or metal roofing
• External wall assemblies behind cladding where vapor permeability is required
• Renovation projects needing a breathable weather-resistant barrier

Key specifications

• Function: vapor-permeable waterproof membrane for roofing and walls
• Primary properties: water resistance to liquid water and permeability to water vapor
• Typical applications: roofing underlay, ventilated roofs, facade backing
• Compatibility: intended for use under standard roofing materials and behind external cladding

How to use

Install ELT-2 on a suitable substrate according to local building regulations and manufacturer guidance. Lay the membrane with the correct orientation, overlapping adjacent sheets to create continuous protection against driving rain while maintaining vapor flow. Secure the membrane using appropriate fasteners or battens compatible with roof or facade construction. Trim and seal penetrations, eaves, and ridges as required to maintain water resistance at junctions.

Recommendations

Use the membrane as part of a complete building-envelope system that includes appropriate ventilation, flashing, and interior vapor control. Ensure roof and wall assemblies provide adequate drainage and airflow to take full advantage of the membrane’s vapor-permeable properties.