JUTA

GP2

GP®2 gas barrier is a multi-layer, low-density polyethylene membrane. Reinforced with a polypropylene reinforcing grid. GP®2 is specifically designed and manufactured to perform as a High Performance Damp proof membrane, radon, air and moisture protection system, as well as low level protection to carbon dioxide and methane.

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Product Benefits

  • High quality reinforced polyethylene membranes.
  • Low permeability to hydrocarbon and VOC vapours, carbon dioxide, methane and radon.
  • Complies with latest codes of practice as published by the BRE and CIRIA, BS 8485.
  • Independently tested by third party UKAS accredited bodies.
  • BBA approved and CE marked.
Product Description

GP®2 should be used on any site where low levels of ground gas is present up to and including CIRIA 665 SITUATION 2. The barrier is sufficiently resistant to the ingress of harmful gases into a building. On more heavily contaminated sites a passive or active venting system may be required to dilute the gases down to acceptable levels and specific design advice should be sought.

GP<sup>®</sup>2
MaterialPolyethylene
Size2 x 50 m x 0.5 mm
Uniclass 2015Pr_25_57_65
CAWSD21/38 Gas-retardant membranes
J40/140 Loose laid plastics or rubber sheet gas retardant damp proofing
J40/145 Loose laid weldable polyethylene gas retardant damp proofing
D21/350 Gas-retardant membrane
J40/35 Loose laid plastics or rubber gas retardant damp proofing
MaterialLow density reinforced polyethylene (LDPE).
Performance characteristics
Tensile strength (minimum)MD: 500 N/50 mm; CMD: 470 N/50 mm.
Tear resistance400 N.
Elongation to breakMD: 15%; CMD: 20%.
Physical properties
Thickness (minimum)0.5 mm.
Width (minimum)2 m.
Roll length (minimum)50 m.
Product ReferenceJUTA GP2 Gas Barrier
Accessory productsJUTA GP Primer.
JUTA GP Self-adhesive membrane.
JUTA GP protection fleece.
JUTA GP tape.
JUTA GP top hats and preformed corners.
JUTA GP void vent.
JUTA GP2 starter band.
Radon permeability4.3 x 10ˉ12.
CharacteristicsTest MethodUnit
Water ColumnEN 20811PASS
Resistance to Water PenetrationEN 13967, EN 1928PASS
Water TightnessEN 1296, EN 1367, EN 1928PASS
CharacteristicsTest MethodUnit
Resistance to Static LoadEN 12730-B20 Kg
Tensile Strength (MD)EN 12311-1500 N/50mm
Tensile Strength (CMD)EN 12311-1470 N/50mm
Tensile Elongation (MD)EN 12310-115 %
Tensile Elongation (CMD)EN 12310-120 %
Puncture ResistanceEN 122361.04 kN
Resistance to Tearing (Nail Shank) MDEN 12310-1400 N
Resistance to Tearing (Nail Shank) CMDEN 12310-1350 N
CharacteristicsTest MethodUnit
Methane PermeabilityBS EN ISO 15105-1<514 ml/m2/day/atm
Carbon Dioxide PermeabilityBS EN ISO 15105-1<514 ml/m2/day/atm
Radon PermeabilityK124/02/954.3 x 10-12 m2/s

BBA certified high performance damp proof membrane is specifically designed and manufactured to perform as a high performance damp proof membrane, Radon (BRE 211), air and moisture protection system, as well as low level protection to carbon dioxide and methane (NHBC Amber 1). GP®2 can be used on any site where low levels of ground gas is present. The barrier is sufficiently resistant to the ingress of Radon into a building. On more heavily contaminated sites a passive or active venting system may be required to dilute the gases down to acceptable levels and specific design advice should be sought.

JUTA UK – radon, ground gas, vapour, air and moisture barrier characteristic properties:

  • High Chemical Resistance
  • High resistance to Ground Gasses
  • Long Term Durability (Performance guaranteed for the lifetime of the building)
  • Compatible with all building materials
  • Manufactured to meet the most up to date British Standards and guidance.

GP®2 should be installed in accordance with the product installation guidelines, and in accordance with best practice.

GP<sup>®</sup>2

A selection of standard details for information and education purposes only. Note - it is strongly advised appropriately qualified, and insured personnel undertake gas membrane installs. A gas membrane performs a critical function in the application setting and has an anticipated design service life in excess of 60 years. Do not attempt to install gas membranes from these details alone. Sole rights for use and distribution are owned by JUTA UK LTD.

Roll weights can be in excess of 20kg and hence appropriate care and equipment is required for unloading and handling.

Rolls of GP®2 should be stored on stable/level ground and stacked not more than five rolls high, with no other material stacked on top. The rolls can be stored outdoors when packaged, but should be protected from exposure to UV.

CE Mark
CE Mark - EN13967:2012
NHBC Logo
NHBC Standards Compliant
BBA Logo
BBA Certified - Certificate No. 12/4912 (P2)
Site Investigation
Site Investigation
Site Investigation Reports Monitoring Results. We review these reports and advise routes for compliance.
System Design
System Design
Full Ground Gas Protection System Design available.
Specification
Specification
Wide library of standard details with site specific details on request.
Installation
Installation
All our installers are certified NVQ Level 2 qualified installation contractors.
Validation
Validation
We ensure your project complies with the relevant building regulations.

Ground Gas Standards 

There are many different standards and guidance documents that detail how to understand the risk of ground contamination, and design solutions to mitigate these risks. The different documents relate to different ground contamination. Below are some of the key documents to be aware of and refer to:

BS 8485:2015+A1:2019 – Codes of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings.

  • Ground gases typically found near landfill sites, but can occur from other sources
  • Encourages the use of qualified installers
  • Validation to Ciria C735 is a requirement
  • Additional influences on the system should be considered, such as the hydrostatic conditions, and the likelihood of the source contaminant being in direct contact with the protective measures proposed
GP<sup>®</sup>2

BRE 211:2015 – Guidance on protective measures for new buildings. (RADON)

  • Naturally occurring ground gas. Larger concentrations in the South-West of UK
  • Minimum recommendation is a membrane of 300 micrometre (1200 gauge) polyethylene sheet or equivalent
  • It must be installed with considerable care and protected once installed
  • Taped laps are required
GP<sup>®</sup>2

CIRIA C748:2014 – Guidance on the use of plastic membranes as VOC vapour barriers

CIRIA C682:2009 – VOC Handbook

  • Risk based approach
  • No quantifiable limits on material performance
  • Testing to ISO 15105-2 and EN 14414/EN 14415
  • 9 main VOC types are tested for
  • Welded laps are required as most tapes are made from bitumen/butyl and are affected by VOCs
GP<sup>®</sup>2

CIRIA C735:2014 – Good practice on testing and verification of protection systems to buildings from hazardous gases

  • Good practice on testing and verification of protection systems to buildings from hazardous gases
  • Check design and detailing is in accordance with site requirements
  • Checks the competency of the installer (NVQ LEVEL 2 minimum)
  • Test integrity of the membrane/barrier system
  • Visual inspection
  • Written report on inspection/testing and sign-off

BS8102:2009 – Code of practice for protection of below ground structures against water from the ground

GP<sup>®</sup>2

JUTA Solutions & Applications

Our gas protection membranes suit a variety of applications and situations, with our TITAN® range offering not only gas protection but also having superior waterproofing and invasive weed control qualities.

BRE 211 NHBC (Amber 1) BS8485:2015 + A1 2019 / NHBC (Amber 2) C748 C748 BS8102:2009 RPS178 C753 BBA Agreement Certificate
Radon Bulk Ground Gasses Cardbon Dioxide and Methane VOC Vapour Permeation Hydrocarbons Immersions TYPE-A Bonded Waterproofing Invasive Weed Control SuDs Impermeable Membrane
GP®1
GP®2
GP®4
GP®5
GP®H
GP®L
GP® TITANFLEX
GP® TITANBOND
GP® TITANTANK
GP® LIQUID BARRIER
GP®H 0.6mm

Get In Touch With The Experts

If you feel first class service, premium products direct from source, and bespoke solutions are right for you then don't hesitate to contact our team today on 01772 754177 or email us at info@juta.co.uk

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