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Visqueen Gas Barrier NF-400Visqueen Gas Barrier NF-400

Visqueen Gas Barrier NF-400 – 2.4m x 43.5m x 400 micron

Brand: Visqueen
Product Code: RS060461
In Stock

Visqueen Gas Barrier NF-400 is a co-extruded, multi-layer thermoplastic gas membrane, suitable for use in all types of buildings to prevent the ingress of harmful levels of methane, carbon dioxide and radon.

£390.00 incl. VAT
£325.00 excl. VAT

Qty:

Visqueen Gas Barrier NF-400 is a co-extruded, multi-layer thermoplastic gas membrane, 0.4mm thick (400 micron). The membrane is transparent with a blue tint and supplied 2.4m x 43.5m in a single wound roll.

Features & benefits:

  • BDA Agrement Certification – third party accreditation
  • Complies with NHBC Foundation NF94 guidance for use in Type A membrane locations – non foil system
  • Complies with the methane gas transmission rate, mass per unit area and thickness requirements of BS 8485:2015 + A1:2019 – industry standard for methane and carbon dioxide protection
  • Transparent – allows a clear view of the substrate during and post installation
  • Multi functional – also acts as a radon and damp proof membrane
  • Dual jointing methods – depending upon specification, lap joints can be heat welded or taped

Usage:

Visqueen Gas Barrier NF-400 is suitable for use in all types of buildings to prevent the ingress of harmful levels of methane, carbon dioxide and radon.

The barrier can be positioned above or below reinforced cast in situ concrete floor slabs e.g. ground bearing, suspended or raft, or above precast suspended segmental subfloors, e.g. beam and block floor.

The barrier can also be used as a high performance radon membrane and/or damp proof membrane.

Radon, carbon dioxide, and methane protection – NHBC NF94 guidance:
Visqueen Gas Barrier NF-400 when installed with either welded or taped joints complies with NHBC Foundation NF94 publication, Hazardous ground gas – an essential guide for housebuilders, in Type A membrane locations in precast suspended segmental subfloors and reinforced cast in situ concrete floor slabs (ground bearing, suspended or raft).

For site or zone characteristic gas situations of CS4 and above, contact Visqueen Technical Services.

The barrier is not intended for use where there is a risk of hydrostatic pressure.

Approvals and standards:

  • Third party accreditation (BDA Agrement Certificate BAB-24-339-P-A-UK) Complies with the methane gas transmission rate, mass per unit area and thickness requirements of BS 8485:2015 + A1:2019
  • Suitable for all Characteristic Gas Situation (CS) ground gas regimes
  • Complies with NHBC Foundation NF94 guidance for use in Type A membrane locations (non foil system)
  • Conforms to the specification requirements of NHBC Amber 1 and Amber 2 applications
  • Conforms to the specification requirements of BR 211:2023
    UKCA UKNI CE to EN 13967:2012
  • Visqueen certified with Quality Management System ISO 9001:2015
  • Visqueen certified with Occupational Health and Safety System ISO 45001:2018
  • Visqueen certified with Environmental Management System ISO 14001:2015
Property Test method Units Compliance criteria Result
Dimensions BS EN 1848-2 m – 2.4 x 43.5
Nominal thickness BS EN 1848-2 mm +/-10% 0.4
Mass BS EN 1849-2 g/m² >370 380
Tensile strength – machine direction BS EN 12311-2 method B N/mm² MDV 26.3
Tensile strength – cross direction BS EN 12311-2 method B N/mm² MDV 29.4
Elongation at break – machine direction BS EN 12311-2 method B % MDV 607
Elongation at break – cross direction BS EN 12311-2 method B % MDV 921
Joint strength – taped joint BS EN 12317-2 N/50mm MDV 217
Joint strength – welded joint BS EN 12317-2 N/50mm MDV 405
Watertightness at 2kPa for 24 hours BS EN 1928 method A – Pass/Fail Pass
Watertightness at 2kPa for 24 hours after ageing BS EN 1296 (12 weeks) + BS EN 1928 method A – Pass/Fail Pass
Watertightness at 2kPa for 24 hours after alkali environment BS EN 1847 (28 days) + BS EN 1928 method A – Pass/Fail Pass
Resistance to impact BS EN 12691 method A mm MLV 200
Low temperature flexibility BS EN 495-5 °C MDV -20
Resistance to tearing (nail shank) – machine direction BS EN 12310-1 N MDV 265
Resistance to tearing (nail shank) – cross direction BS EN 12310-1 N MDV 240
Water vapour resistance BS EN 1931 method B MNs/g MDV 2,296
Water vapour permeability BS EN 1931 method B g/m²/d MDV 0.08
Water vapour resistance factor BS EN 1931 method B μ MDV 1,140,000
Water vapour diffusion equivalent air layer thickness BS EN 1931 method B SD in m MDV 459
Methane gas transmission rate – membrane BS ISO 15105-1 ml/m²/day/atm MDV 13.2
Methane gas transmission rate – welded membrane joint BS ISO 15105-1 ml/m²/day/atm MDV 15
Carbon dioxide gas transmission rate BS ISO 15105-1 ml/m²/day/atm MDV 22
Radon gas transmission rate – membrane SP method

m/s

 MDV <3.0 x 10-9
Puncture CBR BS EN 12236 N MDV 1620
Tensile yield strength – machine direction ASTM D4885-01 kN/m MDV 8
Tensile yield strength – cross direction ASTM D4885-02 kN/m MDV 7.3
Resistance to static loading BS EN 12730 method C kg MDV 15
Elongation yield – machine direction ASTM D4885-01 % MDV 405.3
Elongation yield – cross direction ASTM D4885-01 % MDV 400.2
Tear resistance – trouser method A – machine direction BS ISO 34-1 kN/m MDV 128
Tear resistance – trouser method A – cross direction BS ISO 34-1 kN/m MDV 109.7
Tear resistance – angle method B – machine direction BS ISO 34-1 N MDV 137
Tear resistance – angle method B – cross direction BS ISO 34-1 N MDV 139.6

Please see our our Delivery policy page for full details of our delivery terms and conditions, including information on exclusions, geographical restrictions, third parties, and failed deliveries.

1. Delivery Timescales

We will endeavour to deliver all orders within 1-3 working days (subject to geographical restrictions). Please note, where delivery lead-times for individual orders may be subject to change, we will keep you informed directly by phone or email within 24 hours of your order being placed.

Deliveries will not be made on UK bank holidays, and in such cases will fall on the next working day.

Standard delivery hours are between 8am and 6pm, Monday to Friday. If you are not available to accept the delivery when it is attempted, then a failed delivery charge will be applied (see the Delivery page for full details)

2. Delivery Fee Structure:

All orders, excluding those containing products covered in section 3 below, will be subject to the below delivery fee structure:

  1. Total order weight is between 0kg and 10kg = £7.99 standard delivery fee
  2. Total order weight is between 10kg and 20kg = £12.99 standard delivery fee
  3. Total order weight is between 20kg and 75kg = £20 standard delivery fee
  4. Total order weight is 75kg and above = £60 large order delivery fee
  5. Total order value exceeds £500 (regardless of weight) = Free delivery

3. Exclusions

The delivery fees detailed above apply to all orders, excluding:

  1. Orders containing insulation will be charged at £65 per pallet (10 units per pallet). Please get in touch with us directly for pricing and ordering.
  2. Orders containing protection boards: A large order delivery fee of £60 will be applied.
  3. Orders containing membranes of two metres wide and above: The delivery fee will be calculated as a price per unit*.
Code Description Weight (kg) Delivery Fee Per Unit
Multiple All membrane products with a width of two metres and above Varied £20
M3 Newton CDM 508 Mesh 29.26 £25
M4 Newton CDM 520 eco Floor 37.62 £40

*Please note that, for orders containing membranes of two metres wide and above:

  1. Once the total order weight exceeds 75kg then the £60 large order fee will automatically be applied
  2. Once the total order value exceeds £500 then the free delivery policy will automatically be applied

4. Geographical Areas

The above delivery fees apply to all postcodes in mainland England, Wales and Scotland.

For deliveries to Ireland, Northern Ireland, the Channel Islands, the Scottish Isles, and any international orders please get in touch with the BaseTec team directly by email or phone for a custom delivery price. Standard delivery timescales do not apply to these areas and will be advised on request.

Additional charges, including customs fees, duties, or taxes may apply for international orders.

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