Cromar Vent 3 Classic Breather Membrane Felt Underlay 1.5m x 50m (75m2/Roll)
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Mon 15 Jun
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- Choose Clearpay at checkout to pay later with Pay in 4.
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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
| URN: | 5004114 |
|---|---|
| Brand: | Cromar |
| Width: | 1.5m |
| Length: | 50m |
| Sales Unit: | Roll |
| Sales Unit Coverage: | 75m2 |
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 1.5m width makes this roll particularly suited to large roofs and open areas, reducing the number of overlaps and speeding up installation, thereby improving overall efficiency on site.
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.
- High coverage efficiency: 1.5m width reduces laps, increasing installation speed.
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.
Delivery & Returns Information
Delivery charges vary by product category and order value. Items may ship from different suppliers and arrive separately, so delivery charges can be shown per part of your order at checkout.
Standard (Nationwide) Delivery
|
Core Products Core
|
|
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 ex. VAT | £30 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 | £25 ex. VAT |
| Over £300 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £90 ex. VAT |
| Over £400 ex. VAT | £55 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 |
How delivery works
We work with a nationwide network of trusted suppliers. Items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you will see delivery charges shown at checkout for each part of your order. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery areas
Delivery charges apply to mainland UK, excluding: AB, CA, CF, DD, DG, EH, EX, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, PL, SA, SY, TR, TQ and TD.
If your address is in one of these areas, we will contact you before processing your order to confirm any additional costs. We do not currently offer delivery outside the UK mainland.
What to expect on delivery day
- Deliveries are typically kerbside.
- Please ensure someone is on-site to accept delivery. For heavier items, help with offloading may be required.
- Many building materials arrive on large vehicles. If access is restricted, a specialist vehicle such as a HIAB may be required and could incur an additional charge.
Why delivery can cost more than typical parcel delivery
Building materials often travel on larger vehicles and usually carry fewer drops per run than parcel networks. That is why delivery charges can be higher than standard e-commerce shipping.
Returns
Returns depend on what you have bought and whether there is anything wrong with it. For full details on eligibility, timeframes, and exclusions, please see our full policy.
