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Home // Gas Protection Membranes // Ground Gas Membranes (BS8485) // GP®5+
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GP<sup>®</sup>5+ TDS
GP®5+ TDS
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GP<sup>®</sup>5+ BBA
GP®5+ BBA
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JUTA

GP5+

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GP®5+ gas barrier is a multi-layer composite of virgin polyethylene (PE) giving exceptional resistance to the passage of ground gas and organic vapours. It also acts as a high performance DPM.

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Product Benefits

GP®5+ is suitable for the following applications:

  • Carbon dioxide and methane affected sites in accordance with BS 8485:2015 + A1:2019 & NHBC
  • Radon affected sites in accordance with BRE211:2015
  • Damp protection in accordance with Building Regulations Part C
  • VOC contaminated sites (site specific assessment required)
  • Suitable for use on CS2-CS6 sites, and as a class A/B/C membrane to NF94
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GP<sup>®</sup>5+ TDS
GP®5+ TDS
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GP<sup>®</sup>5+ BBA
GP®5+ BBA
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Product Description

GP®5+ gas barrier is a multi-layer composite of virgin polyethylene (PE) giving exceptional resistance to the passage of ground gas and organic vapours. It also acts as a high performance DPM.

GP®5+ is suitable for the following applications:

  • Carbon dioxide and methane affected sites in accordance with BS 8485:2015 + A1:2019 & NHBC
  • Radon affected sites in accordance with BRE211:2015
  • Damp protection in accordance with Building Regulations Part C
  • VOC contaminated sites (site specific assessment required)
  • Suitable for use on CS2-CS6 sites, and as a class A/B/C membrane to NF94
CharacteristicsTest MethodUnit
ThicknessEN 1849-20.5mm
WidthEN 1849-2Various m
Length EN 1849-2Various m
WeightEN 1849-2500 g/m2
CharacteristicsTest methodUnit
Resistance to Water PenetrationEN 1928 (A)PASS
CharacteristicsTest MethodUnit
Resistance to Static LoadEN 12730> 20 Kg
Tensile Strength (MD)EN 12311-2 (A)> 300 N/50mm
Tensile Strength (CMD)EN 12311-2 (A)> 300 N/50mm
Resistance to Tearing (Nail Shank) MDEN 12310-1> 230 N
Resistance to Tearing (Nail Shank) CMDEN 12310-1> 230 N
Impact ResistanceEN 12691-B500 mm
Puncture ResistanceASTM D 4833> 160 N
Puncture ResistanceEN 122361.60 kN
Reaction to FireEN 13501-1E
CharacteristicsTest MethodUnit
Methane PermeabilityBS EN ISO 15105-10.12 ml/m2/day/atm
Carbon Dioxide PermeabilityBS EN ISO 15105-11.53 ml/m2/day/atm
Hydrogen PermeabilityBS EN ISO 15105-168.7 ml/m2/day/atm
Benzene PermeabilityBS EN ISO 15105-20.4 ml/m2/day
Oxygen PermeabilityBS EN ISO 15105-2<3 ml/m2/day
Radon PermeabilityK124/02/951.0 x 10-12 m2/s
Hydrogen Sulphide PermeabilityBE EN ISO 15105-1<0.16 ml/m2/day/atm
CharacteristicsTest MethodUnit
PetrolBS EN ISO 15105-2(ave.) 3.4 x 10-13 /mol/(m2.s.Pa)
DieselBS EN ISO 15105-2(ave.) 3.4 x 10-13 /mol/(m2.s.Pa)
CharacteristicsTest MethodUnit
Durability Watertightness After Artificial AgeingEN 1928Pass
Durability Watertightness Against ChemicalsEN 1928Pass
View Data Sheet

GP®5+ should be installed in accordance with the product installation guidelines, and in accordance with BS 8485:2015.

Jointing and Sealing

It is recommended GP®5+ can be heat welded where possible, with welding carried out by competent personnel with suitable qualifications in accordance with best practice, and guidance contained within BS 8485:2015. GP®5+ should be overlapped by at least 100mm. If taping joints, only suitable tape must be used, ensuring application with a silicone roller to remove trapped air. JUTA pre-formed details, or self adhesive gas membrane are available for sealing around protuberances.

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

Rolls of GP®5+ 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 - EN 13967:2012
NHBC Logo
NHBC Standards Compliant
BSI Kitemark
BS 8485:2015 + A1 2019 Accordant
BBA Certificate 20 5728
BBA Certified - Certificate No. 20/5728
UKCA Logo
UKNI Logo
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 related 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>5+

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>5+

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>5+

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>5+

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

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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 [email protected]

Contact Us
01772 754177 // [email protected]
Melton Grove Works, Blackpool Road, Lytham, FY8 5PL