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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.

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.

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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.

Specifications

General Information

Material	Polyethylene
Size	2 x 50 m x 0.5 mm
Uniclass 2015	Pr_25_57_65
CAWS	D21/38 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

Specification Data - Plastics Sheets - Enhanced Data

Material	Low density reinforced polyethylene (LDPE).
Performance characteristics
Tensile strength (minimum)	MD: 500 N/50 mm; CMD: 470 N/50 mm.
Tear resistance	400 N.
Elongation to break	MD: 15%; CMD: 20%.
Physical properties
Thickness (minimum)	0.5 mm.
Width (minimum)	2 m.
Roll length (minimum)	50 m.
Product Reference	JUTA GP2 Gas Barrier
Accessory products	JUTA 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 permeability	4.3 x 10ˉ12.

Hydraulic Press

Characteristics	Test Method	Unit
Water Column	EN 20811	PASS
Resistance to Water Penetration	EN 13967, EN 1928	PASS
Water Tightness	EN 1296, EN 1367, EN 1928	PASS

Mechanical Properties

Characteristics	Test Method	Unit
Resistance to Static Load	EN 12730-B	20 Kg
Tensile Strength (MD)	EN 12311-1	500 N/50mm
Tensile Strength (CMD)	EN 12311-1	470 N/50mm
Tensile Elongation (MD)	EN 12310-1	15 %
Tensile Elongation (CMD)	EN 12310-1	20 %
Puncture Resistance	EN 12236	1.04 kN
Resistance to Tearing (Nail Shank) MD	EN 12310-1	400 N
Resistance to Tearing (Nail Shank) CMD	EN 12310-1	350 N

Gas Permeability

Characteristics	Test Method	Unit
Methane Permeability	BS EN ISO 15105-1	<514 ml/m2/day/atm
Carbon Dioxide Permeability	BS EN ISO 15105-1	<514 ml/m2/day/atm
Radon Permeability	K124/02/95	4.3 x 10-12 m2/s

View Data Sheet

Applications

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.

Standard Details

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.

GP^®2
Installation Guidance

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Handling & Storage

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.

Compliance & Certifications

CE Mark - EN13967:2012

NHBC Standards Compliant

BBA Certified - Certificate No. 12/4912 (P2)

Site Investigation

Site Investigation Reports Monitoring Results. We review these reports and advise routes for compliance.

System Design

Full Ground Gas Protection System Design available.

Specification

Wide library of standard details with site specific details on request.

Installation

All our installers are certified NVQ Level 2 qualified installation contractors.

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:

Methane (CH4) and Carbon Dioxide (CO2)

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

Radon (Rn)

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

VOCs & Hydrocarbons

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

General

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

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	BBA Agreement Certificate
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

GP2

Product Benefits

Suspended Slab

Raft Slab

Ground Bearing Slab

Block and Beam Floor

Timber Frame Construction

Existing Slab

Slab At or Above Ground Level

Penetration Details

Pile Cap Seal

GP Sealant

CE Mark - EN13967:2012

NHBC Standards Compliant

BBA Certified - Certificate No. 12/4912 (P2)

Ground Gas Standards

JUTA Solutions & Applications

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