Cromar Vent 3 Classic Breather Membrane Felt Underlay 1m x 50m (50m2/Roll)
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Triple-layer breather membrane for pitched roof applications. Allows moisture escape while resisting wind-driven rain. 1m width suits smaller roof areas and detailing work.
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Wed 8 Oct
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- 9hrs
- 24mins
- 51secs
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Product Overview
Triple-layer breather membrane for pitched roof applications. Allows moisture escape while resisting wind-driven rain. 1m width suits smaller roof areas and detailing work.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
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Core Products Core
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|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 ex. VAT | £20 ex. VAT |
| Over £300 ex. VAT | FREE |
Core Delivery charges apply only when all products in an order that have equivalents are accepted as such. If even one product cannot be substituted with an equivalent, the entire order will not qualify for Core Delivery charges.
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £10 ex. VAT |
| Over £300 ex. VAT | FREE |
| Insulation, Plasterboard and Drylining Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{panorama_horizontal}} Adapts to various roof contours
- {{air}} Withstands high wind uplift and mechanical stress
- {{check_circle}} Suitable for both warm and cold roof systems
- {{invert_colors}} Resists water penetration/ allows moisture vapour to escape
Technical Specification
| Width: | 1m |
|---|---|
| Length: | 50m |
| Sales Unit: | Roll |
| Sales Unit Coverage: | 50m2 |
| Brand: | Cromar |
Technical Downloads
Product Overview
Premium triple-layer breather membrane crafted from high-tensile spun-bonded polypropylene and a micro-porous film. This innovative design resists water penetration while allowing moisture vapour to escape, delivering superior protection and durability for both warm and cold roof applications.
Ideal for fully supported or unsupported tiled, slated, or metal roof systems, the membrane combines high vapour permeability with a robust waterproof barrier.
The outer layer forms a waterproof surface, the middle layer serves as a breathable barrier, and the inner layer protects against abrasion while adding extra strength.
The 1m width makes this roll particularly suited to smaller roofs, detailing work, and confined areas, offering easier handling and reduced wastage compared to wider rolls.
Features & Benefits
- Triple Layer Membrane: Combines three layers for enhanced waterproofing and breathability.
- Lightweight and Flexible: Facilitates quick installation, adapting easily to various roof contours.
- Excellent Tensile and Tear Strength: Withstands high wind uplift and mechanical stress.
- Waterproof Membrane: Provides robust protection against water penetration.
- Long Term Durability: Designed to last, ensuring continued performance over the roof’s lifespan.
- UV Stable: Maintains performance after up to 4 months of exposure.
- Versatile for Roof Applications: Suitable for both warm and cold roof systems.
- No Additional Ventilation Required: Engineered to manage moisture without extra ventilation systems.
- Practical roll size: 1m width suited to small roofs, complex details, and precise applications.
Applications
- Tiled Roofs: Provides a breathable yet waterproof barrier beneath tiles.
- Slated Roofs: Protects the roof structure while allowing moisture to escape.
- Metal Roof Systems: Enhances performance by reducing condensation and ensuring longevity.
- Unsupported Installations: Drapes over rafters, ensuring ease of installation and effective moisture management.
- Direct Over Insulation: Lays directly on top of insulation without compromising its effectiveness.
Installation Guidance
- Fixing: Secure using corrosion-resistant nails, staples, or counter-battens.
- Laps: Maintain recommended side and end lap dimensions to ensure weatherproofing.
- Support: Allow appropriate drape between rafters in unsupported installations.
- UV exposure: Cover with roof tiles or slates within 3 months of installation.
- Standards: Install in line with BS 5534:2014 and manufacturer’s instructions.
Compliance & Performance
- Construction: Triple-layer breathable membrane.
- Function: Vapour-permeable and water-resistant.
- Durability: Resistant to tearing, UV (temporary), and wind-driven rain.
- Compatibility: Suitable for warm and cold roof constructions.
- Important note: Must be installed as part of a ventilated pitched roof system in line with British Standards.
