Cromar Vent3 (135gsm) - High-Performance Breathable Underlay

1m (W) x 50m (L)

Vent3 135gsm Breather Felt is a mid-weight, yet durable, membrane that is designed to provide reliable protection and breathability for pitched roofs and wall applications. Cromar Vent3 135g membrane can also be used for cladding walls. It is a versatile, high-performance breathable, and waterproof membrane designed for both roof and vertical wall applications, particularly in timber frame constructions. It is essential for protecting wall structures from wind-driven rain while allowing moisture to escape.

With a weight of 135gsm, it strikes the perfect balance between strength and ease of installation, ensuring excellent performance in preventing water ingress while allowing internal moisture to escape, reducing the risk of condensation.

Cromar Vent3 (135g) is a high-performance, triple-layer, breathable roofing membrane designed for both warm and cold, ventilated and non-ventilated roof applications. It is a popular, BBA-certified, lightweight, and flexible underlay used by roofers and builders for new builds, extensions, and re-roofing projects.

Key Features & Specifications:

• Weight/Density: 135gsm (grams per square meter)
• Material: Triple-layer spun-bonded polypropylene with a microporous film
• Performance: Highly water-resistant (W1 class), with excellent tensile strength and nail tear resistance
• UV Stability: UV stable for up to 3 months
• Colour: Commonly referred to as the "Blue Label"
• Certification: BBA Approved
• Compliance: Meets UK building regulations for breathable membranes

Usage and Benefits:

• Versatility: Suitable for tiled, slated, or metal roofs, and external wall cladding systems
• Protection: Provides effective protection against wind, rain, and snow while allowing water vapor to escape
• Ease of Use: Lightweight and easy to handle
• Alternative: Often used as a high-performance alternative to traditional bitumen roofing felt