Effisus Breather FR System

Effisus Breather FR membrane should be installed on top of the external insulation (cold side) protecting the entire facade composition. However, depending on the cladding brackets’ complexity (size/ shape), it is acceptable for breather membrane systems to be fixed on the top of the sheathing board. The weatherproofing design of the breather membrane systems should be done in detail and on a project-by-project basis.


Effisus Breather FR waterproofing membrane uses an innovative technology, with a fibreglass basis to obtain fire resistance: Class A1 as membrane and Class A2-s1,d0 as system based on EN 13501-1 and Class A (or Class 1) according to ASTM E84.

Designed for global protection of facades against moisture, driving rain and wind, avoiding corrosion, insulation deterioration and mould growth on facade elements. It has an exceptional UV resistance and is suitable for facades with open or closed joints. The existence of a large range of accessories allows its installation on the most demanding of projects. The final fire classification was obtained for Effisus Breather FR with Effisus accessories (tapes and adhesives), tested as a system.

Features and benefits:

  • Fire protection: Class A1 as membrane and Class A2-s1,d0 as system according to EN 13501-1 (system: Effisus Breather FR membrane with Effisus fixing and sealing accessories).
  • Multifunction: Water tight, UV resistant and vapour permeable (diffusion open).
  • Resistant: High mechanical resistance, with resistance to thermal variations.
  • Universal: Extremely lightweight, suitable for facades with open or closed joints.
  • Complete system: Complete range of accessories for any project needed. Possibility of combining with an A2 Vapour FR System to have a full envelope fire-rated system.
  • Energy efficiency: Improves the air quality of building interior, durability of all the facade components and minimizes the condensation risk.

General information




Exceptional UV resistance






1.27 m x 78.74 m x 0.021 mm.

Uniclass 2015

Pr_25_57_10_94 Vapour permeable sheetsPrimary


H92/120 Rainscreen cladding

H11/110 Curtain walling

Specification data - Vapour permeable sheets Enhanced data

Performance characteristics

Water vapour resistance: 0.013 ± 0.001 m

To EN ISO 12572.

Tensile strength: 2015 / 1725 N/50mm

MD/ CD. To EN 12311-1.

Class (minimum)




Third-party certification

British Board of Agrément (BBA) Certificate.

Thickness (minimum)

0.021 mm.


Installing breather membranes

Reaction to fire

The fire classification was obtained with Effisus accessories (double side adhesive tapes) tested as a system.

Class A (or Class 1), A2 - s1, d0.

Tested as a system. To ASTM E84/ EN 13501-1.


Tested as a membrane. To EN 13501-1.

Joint strength

327 N/50 mm

Elongation at break (to BS EN 12311-1)





Moisture vapour resistance

0.065 MNs/g


Not required

Effisus 2Bond DS tape

Double-sided adhesive tape, based on an advanced technology with active adhesive sealants that ensure excellent adhesion to the most diverse materials: Concrete, aluminium, galvanized steel, sheathing board, EPDM, most roofing membranes (requires compatibility test), etc.

Effisus 2Adjoin DF tape

Double-sided airtight and moisture resistant sealing tape, suitable for fixing all Effisus Vapour FR membranes, PE/PA/PP and aluminium foils to metal studs. This accessory was included in the system fire test according to EN 13501-1.

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