A W1 Breather Membrane

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A W1 Breather Membrane

ARBOShield Pro Class A W1 Breather Membrane is an extremely vapour permeable wall membrane with a low emissivity reflective surface and class A2-s1,d0 fire classification.

ARBO Façade Solutions (ARBO FS) is the new name for a ground breaking initiative from ARBO, one of the longest established names in UK construction materials.

Main Applications

ARBOShield Pro Class A W1 Breather Membrane is suitable for practically all walling applications, especially high-rise and high-risk buildings such as schools, hospitals, care homes and residential blocks, helping to prevent the risk of fire spread. ARBOShield Pro Class A W1 Breather Membrane is also suitable for timber frame or modular off-site construction.

The unique composition of ARBOShield Pro Class A W1 Breather Membrane resists the spread of fire across the cavity of the façade. ARBOShield Pro Class A W1 Breather Membrane can be installed onto almost any substrate.

Size

Thickness 0.43mm
Roll Width 1200mm
Roll Length 35m

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    Technical Data

    StandardDescriptionPerformance
    EN 13501Reaction to FireA2-s1,d0
    EN 13859-1Resistance to Water PenetrationClass W1
    EN 13859-1Tensile Strength MD3200 N/50mm
    BS EN 12311-1
    EN 13859-1Tensile Strength CD3000 N/50mm
    BS EN 12311-1
    EN 13859-1Flexibility at Low Temperature-40 °C
    EN 12572Water Vapour Transmission0.08sd
    EN 13859-1Resistance to Nail Tearing MD580 N BS EN 12310-1
    EN 13859-1Resistance to Nail Tearing CD450 N BS EN 12310-1
    Resistance to UV Exposure9 months, 5,000 hours passed*
    EN 12114Airtightness0.093m³/(h x m2 50 pa)

    Fixing Instructions

    Unroll ARBOShield Pro Class A W1 Breather Membrane and fi x directly to the sheathing or insulation. ARBOShield Pro Class A W1 Breather Membrane should be secured to the substrate using the appropriate fixings. Fixings should be no more than 600mm horizontally and 500mm vertically.

    On a timber substrate, ensure stainless steel staples are used. On a masonry or SFS substrate, the membrane should be mechanically secured with an appropriate fixing that features an EDPM type washer.

    All laps around window or door openings should be sealed using ARBOShield Pro Class A High Tack adhesive tape. Vertically, the membrane should overlap by at least 150mm and with the joints in a staggered pattern.

    ARBOShield Pro Class A W1 Breather Membrane should be installed with a least a 100mm lap horizontally starting at the bottom of the panel and working upwards to ensure the upper layer covers the lower layer, thus protecting the substrate from water runoff.

    Fixing brackets for cladding/wall ties should be installed as per manufacturers’ instructions and care should be taken around the interface between the Breather Membrane and fi xing bracket. Where cavity barriers are installed in the horizontal position ARBOShield Pro Class A W1 Breather Membrane should be lapped over the DPC tray to allow water run-off .

    When using ARBOShield Pro Class A W1 Breather Membrane, as the external airtightness layer overlaps and penetrates through, the Breather Membrane should be sealed using ARBOShield Pro Class A High Tack Sealing Tape.

    The composition of ARBOShield Pro Class A W1 Breather Membrane provides the Breather Membrane with a high level of UV resistance and therefore a long exposure time in both summer and winter, without impacting product performance.

    Care should be administered during installation to prevent any damage to the Breather Membrane. Small puncture areas less than 50mm can be repaired using ARBOShield Pro Class A High Tack Sealing Tape. Should the puncture or tear exceed 50mm then the repair should be made using new Breather Membrane and taping around the inserted section.

    Storage

    ARBOShield Pro Class A W1 Breather Membrane should be stored in cool, dry conditions in the upright position.

    Health & Safety

    The material Safety Data Sheet must be read and understood before use. All relevant standards should be observed on site, including manual handling and working at height.

     

    Data Sheet PDF