Monarflex NecoSeal

Monarflex NecoSeal

Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type


Radon, air and moisture barrier.

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A single layer membrane manufactured from a virgin blend of polyethylene that’s designed to prevent the ingress of radon gas. It provides an effective barrier to the passage of radon, air and moisture from the underlying soil. Can be used in conjunction with Monarflex Top-Hat units with retention clips, Monarseal Easi-Flash Self-adhesive Radon Flashing and Easi-Pour Liquid Radon Sealant.

Joints should be sealed with Monobond RT Tape.

Necoflex RAM system:

Can be used with other products to form the radon, air and moisture protection system for ground floors in buildings. It is used to seal floors, walls and service penetrations, thereby ensuring the necessary degree of separation between the interior spaces of a building and the underlying soil.

General information


4 x 20 m rolls

Uniclass 2015

Pr_25_57_65_60 Plastics sheetsPrimary


D21/350 Gas-retardant membrane

D21/38 Gas-retardant membrane

J40/140 Loose laid plastics or rubber sheet gas retardant damp proofing

J40/35 Loose laid plastics or rubber gas retardant damp proofing

Specification data - Plastics sheets Enhanced data

Product Reference

Monarflex NecoSeal

Standard product features


4 x 20 m rolls.


0.3 mm (1200g).




End and side laps minimum 150 mm.

Technical properties:

  • Elongation: <780%.
  • Tear resistance: >190 N.
  • Tensile strength: >345 N/ 50 mm.
  • Water vapour transmission: <0.21 gm²24hr.

Third party certifications
  • IAB: Certificate: 09/0328
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