A fire-retardant (FR) breather membrane is used in a facade to help protect the external wall build-up from wind-driven rain and water ingress while allowing water vapour to pass through. It provides a weather-resistant layer within the facade build-up, while its fire classification can help project teams assess whether it is suitable for their specification. KlasseWRAP® KW015 FR Breather Membrane is designed for facade applications and use with Klasse C-board®. Its three-layer construction combines polypropylene outer layers with a polyethylene core. Lightweight, flexible and hard-wearing, KW015 is classified B-s1,d0 for reaction to fire.
What does an FR breather membrane do?
An FR breather membrane has two key functions in a facade build-up:
- It helps resist water from outside, including wind-driven rain.
- It allows water vapour to pass through, helping the wall build-up breathe.
Managing moisture is an important part of facade design. A membrane that resists water from the outside while remaining vapour-permeable can help reduce the risk of moisture accumulating within the wall build-up. Performance depends on the design of the whole wall and on correct product selection, detailing and installation. The “FR” in FR breather membrane refers to the product’s fire-retardant classification. For KlasseWRAP® KW015, the published reaction-to-fire classification is B-s1,d0. The right product and classification for a project should be checked against its design requirements and relevant fire strategy.
Meet KlasseWRAP® KW015 FR Breather Membrane
KlasseWRAP® KW015 is a three-layer membrane developed for facade applications. Its polypropylene outer layers and polyethylene core create a membrane designed to be lightweight and flexible while remaining robust and hard-wearing.
Key product details include:
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Application: Facade use, including use with Klasse C-board®
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Construction: Three layers, with polypropylene outer layers and a polyethylene core
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Reaction to fire: B-s1,d0
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Standard: BS EN 13859-2
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Roll size: 1,500 mm wide by 50 m
Its flexibility can help make handling and positioning practical during installation. As with any membrane, the product should be specified and installed in line with the project design and the manufacturer’s current technical information.
KlasseBOND® KB003 UVFR Jointing Tape
KB003 is designed to seal joints and overlaps in external wall systems. It is suitable for use with KlasseWRAP® Breather Membranes and Klasse sheathing boards.
KlasseBOND® KB001 Double-Sided Bonding Tape FR
KB001 is a double-sided tape developed to provide a bond when installing KlasseWRAP breather membrane to sheathing boards, like Klasse C-board.
A coordinated membrane and tape range
KlasseWRAP® KW015 combines vapour permeability, water resistance and a B-s1,d0 reaction-to-fire classification for facade applications. KlasseBOND® KB003 UVFR Jointing Tape and KB001 Double-Sided Bonding Tape FR are associated products for membrane jointing and bonding. Together, these products give specifiers and installers a coordinated range to consider for facade projects using Klasse C-board®. The correct combination and installation details should always be confirmed for the specific application.
Find out more about the Klasse FR membrane range
Explore KlasseWRAP® KW015 FR Breather Membrane, KlasseBOND® KB003 UVFR Jointing Tape and KlasseBOND® KB001 Double-Sided Bonding Tape FR. For help choosing products for your application, contact the Klasse team.
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