Cromar Vent 3 Classic Breathable Membrane - 1.5m x 50m - 115gsm
2 Customer Reviews
Product Description
Vent 3® Classic is a breathable roof underlay that gives major benefits over traditional underlays.
The Cromar breather felt is made from two, high-tensile, spun-bonded polypropylene layers. This triple layer, high performance, breathable membrane is thermally calendared to a micro-porous polypropylene film.
- Layer one - waterproof surface
- Layer two - breathable waterproof membrane
- Layer three - protection from abrasion and damage, giving additional strength
This products has exactly the same specifications as the Vent 3 Light breathable membrane, but the Classic has a heavier GSM at 115, compared to this Light's 95 GSM.
Benefits
- Clean and easy to use
- Lightweight and flexible
- Waterproof membrane
- High vapour permeability
- Long-term durability and tensile/tear strength
- High wind uplift resistance
- BS 5534:2014 compliant
Application
Can be used in supported or unsupported roof systems, regardless of whether they are tile, slate or metal, and in warm and cold roof applications.
Equally effective whether draped unsupported over rafters or laid directly onto insulation.
Product Specification
| Brand | Cromar |
| Colour | Light grey upper, white lower |
| Compliance | Yes |
| Elongation | 51 longitudinal, 65 transverse (%) |
| Length | 50m |
| Roll Area | 75m² |
| Roll Weight | 8.7kg |
| Storage | Rolls should be stored flat on their sides on a smooth, clean, dry surface & under cover protected from sunlight |
| Tear Resistance (L/T) | 99 longitudinal, 110 transverse (N) |
| Tensile Strength | 195 longitudinal, 130 transverse (N per 50mm) |
| Thickness | 0.43mm |
| Water Tightness | W1 unaged, W1 aged |
| Water Vapour Transmission (Sd) | 0.02 |
| Weight | 115gsm |
| Width | 1.5m |
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