Breather Membranes
What is it? A Breather Membrane is a fire-classified, microporous membrane that provides a vapour- permeable protective layer around buildings. Where is it used? Breather Membranes are secured horizontally or vertically to the sheathing board using double-sided tape, and sealed at joints/ overlaps/edges using UV Facade Tape. Why do we use it? The Breather Membrane provides a weather resistive layer, whilst at the same time, allowing vapour to escape from the cavity, and thus reducing the risk of condensation and vapour build-up.
BREATHER MEMBRANES Harmonised Standard
MIN. REQUIREMENT
OBEX CORTEX 0521FR
OBEX CORTEX 0520FR
OBEX CORTEX 0220FR
OBEX CORTEX 0221FR
OBEX CORTEX 0223FR
STANDARD
EN 13859-2 Compliance
Compliant
Compliant
Compliant
Compliant
Compliant
Fire Classification EN 13501-1 B-s3,d0 minimum B-s1,d0
B-s3,d0
A1
A2-s1,d0
A2-s1,d0
Water Penetration
EN 1928
W1/W2
W1
W1
W2
W2
W1
Airtightness
EN 12114
<0.1m³ leakage
0 m³/h/m²
<0.1m³
84m³
84m³
<0.1m³
Water Vapour Transmission
EN ISO 12572 Set C
<0.12m
0.1m
0.1m
0.03m
0.03m
0.08m
> 100N/50mm (MD, CD)
Tensile Strength EN 12311-2
255 / 180
255 / 180 3828 / 1992 3828 / 1992 2968 / 3253
Tear Strength
EN 12310-2 > 80 N (MD, CD)
100 / 106
100 / 106
356 / 424
356 / 424
577 / 453
Cold Temperature Flexibility
EN 495-5, EN 1109
-40°C
Pass
Pass
Pass
Pass
Pass
UV & Heat Ageing EN 1296/1297 Pass - watertight
Pass
Pass
Pass
Pass
Pass
Service Temperature
-40°C to >+70°C
Yes
Yes
Yes
Yes
Yes
UV resistance
6 months
Yes
Yes
Yes
Yes
Yes
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