The OBEX CORTEX 0521FR is a Class B fire-classified, self-adhesive breather membrane engineered for external wall and façade applications. This advanced membrane integrates a fire-classified, self-adhesive backing and breathable, and airtight layer, offering a fully compliant solution in line all UK construction regulations.

Designed with a focus on ease of installation, superior performance, and compliance with construction standards, the OBEX CORTEX 0521FR sets a new benchmark in the field of breather and vapour permeable membranes for external applications. Its innovative features ensure it stands out as the superior option for professionals seeking reliable and effective building envelope solutions.

Key Benefits

GOLDEN THREAD ALIGNMENT – Class B fire classified, independent of the substrate, for full compliance with Reg 7.
REDUCE WATER INGRESS ISSUES – Rigorously tested to EN 1928 achieving W1 water resistance for ultimate performance.
EASIER PROJECT SCHEDULING – 6 months UV resistance for optimum project scheduling flexibility.
SUITABLE FOR OPEN CLADDING – Also available in plain black for the ultimate solution behind open rainscreen cladding.
EASIER INSURANCE APPROVAL – Full 3rd party approval with internationally recognised KIWA BDA.
LESS WASTE & DAMAGES – Excellent scuff and tear resistance with a highly durable outer coating.
IMPROVED HEALTH & SAFETY – Ergonomically designed roll sizes to aid manual handling and reduce musculoskeletal issues.
COMPLETE PEACE-OF-MIND – 20 year warranty for full confidence in the integrity of the product.
PROMOTE YOUR OWN BRAND – Custom options available to elevate your brand’s visibility and enhance brand recognition.
UP TO 30% QUICKER INSTALLATION – Split release liner for faster and improved installation with greater control and accuracy.

Typical Applications Include:

For use on external façades, normally applied direct to the sheathing board to prevent water ingress and allow vapour to escape.


3rd Party Certified
6 Months Exposure
6 Months Outdoor
Class B
Lightweight
Breathable
Vapour Permeable
W1 - EN 13859-2


Product Specs

Width
1100mm or 370mm options

Length
25m

Thickness
0.38mm

Colour
Black (OBEX Branded) or Plain Black


Technical Specs

Harmonised Standard

EN 13859-2

Fire Classification | EN 13501-1

B-s1,d0

Watertightness | EN 1928

W1

Sd value | EN ISO 12572

0.1m

Tensile Strength | EN 12311-2

Longitudinal: 255 N/50mm, Transverse: 180 N/50mm

3rd Party Approved

KIWA Approval

UV Resistance

6 Months

Passive House Rating

A


Data Sheets

Declartion Of Performance

Installation Guide

Safety Data Sheet

Technical Data Sheet

The above information is based on current test data, health and safety information and application instructions supplied by our suppliers and manufacturers of the products. It is supplied for guidance and to the best of our knowledge is true and accurate. Customers should satisfy themselves to the suitability of the products in its intended use and no guarantee is given or implied as the conditions of actual use are beyond our control. If in doubt the customer should consult the designer of the project or the local building control. 

Fire Stopping Shop, disclaim any liability for loss, damage or other expense which may arise from the use of this information, data or products refereed to and reserve the right to amend or change any details without notice. This statement does not affect your statuary rights.--