Monarflex RAC Radon Barrier Membrane

Monarflex RAC - Radon Barrier Membrane

Monarflex RAC radon barrier is a high performance, loose-laid membrane developed specifically for use in the foundations of new buildings on contaminated sites where Volatile Organic Compounds (VOCs), Hydrocarbons (HCs) and landfill gases exist e.g. methane and CO2 (please contact Necoflex for specific application guidance).

Monarflex RAC radon barrier membrane comprises 6 individual layers. These include 4 layers of virgin low density polyethylene (LDPE) film, a 12 x 12mm multi-filament polyester (1670 dtex) reinforcing grid and a 12µm aluminium foil layer. The all-important aluminium layer is what gives RAC its exceptionally high gas resisting properties. It is sandwiched carefully between two layers of polyethylene for extra protection. Monarflex RAC radon barrier membrane should be used in conjunction with Alumite Gas DPC

Features & Benefits

  • Heavy-duty, multi-layer barrier membrane: 0.8mm thick with reinforcement, can handle heavy foot traffic and certain site machinery.
  • Suitable for use under heavily reinforced concrete slabs, ground beams and pile-caps where an increased risk of damage exists.
  • Exceptional gas resistance properties. Suitable for radon and the range of gases associated with landfill sites.
  • High performance moisture vapour barrier.
  • Enhances the overall air-tightness performance of a building

Product Availability

Product Code Description Roll Size Roll Weight
3003381 Monarflex RAC 2m x 25m 41kg


Product Data and Performance

Performance Data:
Colour: Grey
Thickness: 0.8mm
Weight: 813g/m²
Tensile Strength: >830N/50mm
Tear Resistance: > 712N
Monarflex Extrusion Weld Strength: 320N
Monobond Tape Strength: 57N
Elongation: <29%
Moisture Vapour Transmission: <0.03 g/m²/day
Water Vapour Resistance: >20520MNsg-1
Radon Gas Transmittance: 1x10-9 m/s-1
Radon Gas Permeability: 0.4x10-12 m2/s
Methane Transmittance: <0.001cm3 /hm2 /atm


    Necoflex - Ireland's most complete range of radon barrier membrane systems, scaffold sheeting,  temporary roof covers, debris netting and acoustic systems