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Effisus Breather FR-B System


Class B fire rated weatherproofing breathable membrane.

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Designed for open or closed rainscreen cladding systems, cavity and masonry, leaf weatherboarding panels, tile/ slate and timber frame cladding. Suitable for facades with cladding open joints up to 50 mm and maximum up to 50% of facade area.


Fire-retardant waterproofing breathable membrane, made of polyester nonwoven with a waterproof special coating. Has exceptional UV resistance, and it protects the building against driving rain and moisture, preventing future corrosion, insulation deterioration and mould growth. Increases the building energy efficiency and minimizes the condensation risk.

Features and benefits:

  • Fire protection: Fire Class B-s1, d0, according to BS EN 13501-1.
  • Resistant: Resistant to thermal variations with high tensile strength.
  • Universal: Suitable for facades with open joints up to 50 mm and up to 50% of exposed facade area.
  • Energy efficiency: Improves the air quality of building interior, durability of all the facade components and minimizes the condensation risk.
  • Complete system: Complete range of accessories for any project needed.


Membrane to be installed with all the ancillary items:

  • Effisus Adjoin TI tape: Membrane overlaps sealing; Membrane perforations sealing;
  • Effisus 2Bond DS tape; Sealing of nail/screw membrane penetrations;
  • ~Effisus Adhesive KF+P: Membrane perimeter sealing and membrane overlap sealing;

General information







Nonwoven with one side coating.




50000 mm


1500 mm


Pr_25_57_10_94 Vapour-permeable sheetsPrimary


H92/785 Breather membrane

H21/130 Breather membrane

P10/320 Breather membrane

H21/20 Breather membrane

H11/110 Curtain walling

H92/120 Rainscreen cladding

P10/65 Breather membrane

Specification data - Vapour-permeable sheets


To BS EN 13859-1.

Performance characteristics

Tensile strength: 370/ 270 N/50mm

MD/ CD. To EN 12311-1.

Class (minimum)



Polyester with waterproof coating.



Thickness (minimum)

0.6 mm.

Reaction to fire

B–s1, d0.

Sd value

0.02 m.

Tear resistance (BS EN12310-1)

150 N.

Elongation at break (to BS EN 12311-1)


Dimensional stability (to EN 1107-2)



Not required.

Effisus Adjoin TI Tape.

Used to form a secure and permanent seal of overlaps between Effisus Breather FR –B and other vapour barriers and/or breathable membranes, sheathing boards joints, roof underlays and wall membranes (EPDM, Polypropylene, Polyethylene, etc.) and non-mineral surfaces. Effisus Adjoin TI Tape is also suitable for sealing butt joints between wood-based, cement, silicate calcium boards, gypsum fibreboards or other similar sheathing boards.

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 Bonding KF+P Adhesive.

Effisus Bonding KF+P Adhesive brings together a solvent-free innovative adhesive and sealant with exceptional properties of waterproofing and UV resistance, and suitable elongation.

Environmental information

Contains Red List materials


Case studies

Good Luck Hope, London

Good Luck Hope, London

Nine Elms Square, London

Nine Elms Square, London

Centenary Quay, London

Centenary Quay, London

MMU SODA Building, London

MMU SODA Building, London

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