Vent3 AIR - Air Open and Vapour Permeable Breather Membrane - Breathable Roofing Felt
Verified by manufacturer 5 months ago
The new Air Open and Vapour Permeable breather membrane is suitable for all roof types, without the need for any additional ventilation at ridge level as recommended in the guidance from the NHBC.
Application
Suitable for all roof types, including cold and unsupported roofs, and Scottish practice such as sarking and butt-jointed planks without the need for a vapour control layer or any additional ventilation at ridge level (as recommended in the guidance from the NHBC). To be installed under tiles and slates, for use as an underlay in both pitched roof and walling applications.
Its outstanding air permeability, low vapour resistance, excellent watertightness makes it an effective breather membrane when installed under tiles and slates. These characteristics makes the Vent 3 AIR compliant for all roof structures up and down the UK.
The Vent 3 AIR will give airflow and allow the movement of vapour moisture from the roof space therefore preventing the risk of interstitial condensation within the roof in accordance with BS 5250 and NHBC requirements.
With an air permeability that far exceeds that of the 50 Pascals to BS EN 12114 our air open breather is also fully compliant to the BS 5534:2014+A2:2018 meeting zones 1-3 at 345mm batten width.
Description
Air permeable, high performance breathable membrane suitable for use in a range of applications.
Features and benefits:
- Good air permeability - exceeds the BS EN 12114 requirement.
- High level of watertightness.
- Compliant for use across all roof structures across the UK.
- Provides airflow, and allows the movement of vapour moisture from the roof space, therefore preventing the risk of interstitial condensation within the roof.
- UV resistant.
- Excellent hydrophobic qualities.
- No vapour control layer needed.
- Eliminates the need for additional ventilation.
- For use under tiles and slates as a pitched roof underlay.
- Compliant for use in zones 1, 2 and 3 on a 345 mm battened lap – without the need for taping.
- Compliant with BS 5534.
- CE/ UKCA marked.
Roof pitch tolerances:
- 12.5–14°: Minimum horizontal lap partially supported: 150 mm; Minimum horizontal lap fully supported: 225 mm; Minimum horizontal lap: 100 mm.
- 15–34°: Minimum horizontal lap partially supported: 100 mm; Minimum horizontal lap fully supported: 150 mm; Minimum horizontal lap: 100 mm.
- 35°+: Minimum horizontal lap partially supported: 75 mm; Minimum horizontal lap fully supported: 100 mm; Minimum horizontal lap: 100 mm.
General information
Color | Orange |
Finish | Smooth |
Material | Felt Polypropylene |
Shape | Rectangle |
Length | 50000 mm |
Width | 1000 mm |
Warranty description | Other |
Uniclass | |
CAWS | P10/65 Breather membrane P10/320 Breather membrane H60/235 Vapour-permeable underlay H61/235 Vapour-permeable underlay H62/235 Vapour-permeable underlay H64/307 Vapour-permeable underlay H67/290 Vapour-permeable underlay H65/235 Vapour-permeable underlay H91/305 Vapour-permeable underlay H60/22 Vapour-permeable underlay H61/22 Vapour-permeable underlay H64/22 Vapour-permeable underlay H65/22 Vapour permeable underlay H67/24 Vapour-permeable underlay |
Specification data - Plastics sheets
Material | Polypropylene. |
Purpose | Breather membrane. |
Performance characteristics | |
Tensile strength (minimum) | 310 N/50 mm (MD); 220 N/50 mm (TD). |
Tear resistance | 184 N (MD); 210 N (TD). |
Elongation to break | 53% (MD); 57% (TD). |
Water vapour resistance (minimum) | <0.03 MN·s/g. |
Fire performance | To BS EN 11925-2, Class E. |
UV stabilization | 2190 hours.Guidance for specification option: (3 months). |
Physical properties | |
Colour | Orange. |
Weight (minimum) | 165 g/m². |
Dimensions | |
Width (minimum) | 1 m. |
Roll length (minimum) | 50 m. |
Water vapour transmission | W1. |
Sustainability data
Contains Red List materials | No |
Country of material origin | United Kingdom |
Country of product manufacture | United Kingdom |
BIM objects
NBS BIM Object Standard
This BIM object has been authored to meet the requirements of the NBS BIM Object Standard.
Find out more about the NBS BIM Object Standard.
| Platform | Compatible | Version |
|---|---|---|
 Revit | - | 1 |
 IFC | - | 1 |
Literature
Vent3 AIR Technical Datasheet
Vent 3 Air Leaflet
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Vent3 Breathable Membranes - Breathable Roofing Felt