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Professional Building Supplies£52.14Visit shop Cromar Breather Membrane Vent 3 Classic - 1Mtr X 25Mtr X 115Gsm
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The Vent 3 Classic Breather Membrane is ideal for roofing contractors and builders looking for a high-performance, three-layer solution that simplifies ventilation requirements for both cold and warm roof applications. It excels at providing a robust secondary barrier against wind-driven rain and snow while maintaining excellent vapour permeability to prevent interstitial condensation. The primary caveat is the material's three-month UV stability limit, which necessitates that external cladding or roof coverings be installed within this timeframe to avoid degradation.
| Model Part Number | TV3C25 |
|---|---|
| Brand | Cromar |
Yes, it is designed for use behind external cladding as well as for roof underlay applications.
The membrane has a density of 115gsm.
No, because the product is highly vapour permeable, it often eliminates the need for additional roof ventilation.
The product is UV stable for a period of three months.
The roll measures 1 meter in width by 25 meters in length.
The membrane has likely exceeded its three-month UV exposure limit. Replace the affected section if structural integrity is compromised.
Verify that all laps have been correctly sealed and that there are no gaps in the membrane layer where warm, moist air can bypass the barrier.
To install, roll out the membrane parallel to the eaves, ensuring it is pulled taut. Each layer should overlap the previous one according to the pitch of the roof; consult the BBA guidelines for specific lap requirements based on roof slope. The membrane should be secured using corrosion-resistant staples or nails.
Compatibility covers most standard tile, slate, and cladding systems. Care must be taken during installation to prevent sharp tools from puncturing the membrane. If accidental damage occurs, patches should be applied using appropriate airtight tape. Because the membrane is UV-stable for only three months, ensure the project timeline accounts for the installation of the final protective layer of roof tiles or cladding to prevent long-term environmental degradation.
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