VARA VISCO SA™ is a fully self-adhesive, humidity-variable vapour control membrane designed for internal airtightness applications in high-performance building envelopes.

Manufactured from a specialised polymer membrane with integrated reinforcement and slip-resistant surface technology, it combines airtightness, vapour control, and installation efficiency in a single layer.

Unlike conventional vapour control layers with fixed vapour resistance, VARA VISCO SA™ features variable vapour permeability, adapting to seasonal humidity conditions to support moisture-resilient construction assemblies.

With an approximate Sd range of 1 m to 5 m, the membrane helps limit vapour transfer during colder conditions while allowing greater drying potential when environmental conditions change.

The fully self-adhesive backing creates a continuous airtight layer across walls, ceilings, and roof structures while reducing installation time and improving airtightness continuity.

Why Choose VARA VISCO SA™

Variable Vapour Resistance

Unlike traditional fixed-resistance vapour control layers, VARA VISCO SA™ adapts to changing humidity conditions, supporting improved drying potential within building assemblies.

Continuous Airtightness

The fully bonded adhesive layer creates a continuous airtight barrier across the substrate, helping reduce uncontrolled air leakage and associated heat loss.

Moisture-Resilient Construction

Variable vapour performance helps support moisture-safe design strategies by balancing vapour control with drying potential.

Integrated Slip Resistance

A specially developed surface provides improved slip resistance during installation, enhancing handling and site safety.

Fast Installation

Full surface adhesion reduces the need for mechanical fixings and simplifies installation across large areas.

Long-Term Durability

Reinforced construction delivers strength, dimensional stability, and reliable performance throughout the service life of the building.

Key Performance Features

• Fully self-adhesive membrane
• Variable vapour resistance (approximately Sd 1–5 m)
• Continuous airtightness layer
• Specialised polymer membrane construction
• Integrated slip-resistant surface
• Reinforced for durability and dimensional stability
• Supports moisture-resilient building design
• Suitable for walls, ceilings, and roof applications

System Compatibility

Fully compatible with Partel airtightness system components, including tapes, primers, liquid-applied membranes, and penetration sealing solutions.

Designed as part of a continuous airtight building envelope strategy.

Technical Data

*MD = Longitudinal
*CD = Transversal
*Values marked with * are facer-only values
as shown on artwork.

Suitable for:

• Timber frame construction
• Steel frame systems
• Modular and offsite construction
• Retrofit projects
• Passive House construction
• Low-energy residential buildings
• Commercial building envelopes
  

Dimensions:

• 1.45 M X 30 M = 43.5 M² | 4 FT 9 3/32 IN X 98 FT 5 3/32 IN = 484 SF

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