Cromar Vent3 Light – Breathable Membrane
- Suitable For: all pitched roof applications
- Area of use: EXT
- Volume: 1m x 25m 1m x 50m 1.5m x 50m
- Type: felt
- Colour: grey
- Brand: Vent3
- Manufactuer: Cromar
- Box Size: Single
Data Sheets
APPLICATION
- Install Vent3 Light following relevant sections of BS 5534:2014+A2:2018 and Cromar’s fixing instructions.
- Consider Vent3 Light as a secondary barrier to wind-driven rain and snow, not a primary waterproofing layer.
- While UV stable for up to 3 months exposure, apply the primary waterproofing finish promptly.
- Under slating membranes should not serve as temporary weatherproof protection for occupied buildings or during internal fitting out; additional protection is necessary.
- Unroll Vent3 Light across the roof, starting from the eaves with the light grey (printed) side up.
- For normal slates and tiles, drape Vent3 Light membrane 10mm to 15mm into the void between rafters and secure with tiling battens.
- In fully supported systems, lay Vent3 Light over support and secure with counter battens, or install over counter battens and fix at 200mm centres using corrosion-resistant straps or galvanised clout nails.
- Ensure a minimum airspace of 25mm between roof sheet underlay and tiles for drainage and ventilation.
- In unventilated roof systems, employ vapour control measures below the insulation layer to restrict moist air flow from within the building into the roof space; ensure proper building ventilation according to regulations.
- Wedge abutment flashing into a mortar joint 25mm deep and at least 150mm above the level of slates or tiles.
- Turn Vent3 Light underlay up behind flashing at least 100mm to prevent rain and snow infiltration into the roof-space.
- Lap joints in the membrane should generally follow guidelines; fix 600mm reinforcing strips at hips, ridges, and valleys.
- Install Cromar felt support trays at eaves to prevent ponding behind the fascia; lay Vent3 over the support tray, stopping short of roof tile tails to prevent UV degradation of the underlay.
LIMITATIONS
- Users must ensure suitability for use; Safety Data is available upon request.
- Prior to use, carefully read the label for essential health and safety information.
- Exercise caution regarding health and safety, especially when working at height; the safety of all construction workers is paramount.
- Cromar Vent3 breather membranes should not be utilized as part of a fall arrest system.
- Exposure: Vent3 breather membranes may remain unprotected for up to 3 months, but it’s recommended to install tiles or slates promptly to minimize the risk of water ingress through unsealed overlaps, edges, and nail holes. Following guidance from NHBC and BBA, it’s advisable to cover the felt within a few days.
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| Elementlength | |||||||
| up to 1,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
|
| Type of window frame material |
Minimum witdth of joints for a butled mounting b in mm |
Minimum witdth of joints for a inner mounting b in mm |
|||||
| Hard PVC (white) | 10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Hard PVC and PMMA (dark) (colour extruded) |
15 | 20 | 25 | 30 | 10 | 15 | 20 |
| Hard PUR integral foam | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Wood-aluminium-window | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (bright) |
10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (dark) |
10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Wooden window frame | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
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