Name: Cromar Vent3 50 Meter Long Light Breathable Roof Membrane
Brand: cromar
SKU: BW-26511
Price: 33.50 GBP
Availability: InStock

Product Description

Cromar Vent3 50 Meter Long Light Breathable Roof Membrane - Various Width Available

Breathable roof underlay for cold and warm roof applications
Triple layer fabric, high performance breather membrane, made from high tensile spun bonded polypropylene layers, around a microporous polypropylene film
Designed for use in a fully supported or unsupported tiled, slated or metal roof system
Excellent tensile, tear strength and high wind uplift resistance
Outer layer forms the functional waterproof surface, the middle layer is the breathable waterproof membrane, and the inner layer protects the membrane from abrasion and damage and also giving additional strength
Upper surface is Dark Grey, printed with the trade name and head lap lines.
Weight: 95 g/m2
Roll Size: 50m x 1.5m = 75 square metres / 50m x 1.0m = 50 square metres
Roof Pitch:12.5 degrees - 14 degrees = Lap: 150mm
Roof Pitch: 15 degrees - 34 degrees = Lap: 100mm
Roof Pitch: 35 degrees+ = 75mm
BBA certified
Cold and warm roof application
3 layer spunbonded membrane
Clean and easy to use
Lightweight and flexible
Excellent tensile strength
Light grey surface prohibits glare
UV stable for up to 3 months
Requires no ventilation.

Specification

Width
1000mm,1500mm

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Cromar Vent3 50 Meter Long Light Breathable Roof Membrane

£33.50^Each

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Download the Technical Data Sheet Pdf File

Application:
Vent3 Light must be installed in accordance with the relevant sections of BS 5534:2003 and the manufacturers fixing instructions
Vent3 Light is designed as a secondary barrier to wind driven rain and snow, it should not be considered a primary waterproofing layer
Whilst the product is UV stable for up to 4 months exposure, good roofing practice dictates that the primary waterproofing finish (e.g. tiles, slates etc.) be applied as soon as practically possible
Under slating membranes should not be considered as temporary weatherproof protection for occupied buildings or where internal fitting out is taking place. Additional protection should be afforded in these circumstances.Vent3 Light should be unrolled across the roof, starting at the eaves and working up the roof, it is usually laid Dark Grey (printed) side up
With normal slates and tiles the Vent3 Light membrane can be installed draped 10mm to 15mm into the void between the rafters, it can then be secured with the tiling battens
This will leave sufficient space between the Vent3 Light and the tiles/slates for drainage and ventilation
Vent3 Light when installed as a fully supported system, is laid over the support and secured with counter battens, alternatively the membrane can be installed over counter battens and fixed at 200mm centres using corrosion resistant straps or galvanised clout nails
Tiling battens are fixed to the counter battens leaving a minimum airspace of 25mm between the roof sheet underlay and the tiles for drainage and ventilation
In unventilated roof systems vapour control measures are required below the insulation layer to restrict the flow of moist air from within the inhabited building into the roof space
Additionally, the building below should be ventilated in accordance with the Building Regulations with water tanks sealed
Abutment flashing should be wedged into a mortar joint 25mm deep and at least 150mm above the level of the slates or tiles
Vent3 Light underlay should be turned up behind the flashing at least 100mm to prevent rain and snow being blown into the roofspace
600mm reinforcing strips should be fixed at hips, ridges and valleys
At the eaves felt support tray should be installed to prevent ponding behind the fascia
The Vent3 Light should be laid over the support tray stopping short of the roof tile tails to prevent UV degradation of the underlay
Notes: As with all breather membranes of this type, contact with solvents or wet timber preservatives can cause localised water penetration to occur, prior to the main weatherproofing being installed
In accordance with BS 5534: 2003 Section 5.5.2.7 (c), where a roof underlay or breather membrane is to be laid over open rafters, a drape of between 10mm to 15mm between the rafters is desirable to guide any rainwater penetrating the main roof finish away from the rafters to the drainage point. (The membrane must not be pulled tight against the underside of the tiling battens.)

Available Width:
1000mm - TV3L/50
1500mm - TV3L/75

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Cromar Vent3 50 Meter Long Light Breathable Roof Membrane

Variations & Sizes

Product Description

Specification

Cromar Vent3 50 Meter Long Light Breathable Roof Membrane

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