Visqueen Gas Barrier

Brand Visqueen

Search ID VIS11466

Suitable for use in all types of buildings to prevent the ingress of harmful levels of ground gases e.g. methane, carbon dioxide and radon. The barrier can be positioned above or below reinforced cast in situ concrete floor slabs or above precast suspended segmental subfloors, e.g. beam and block floor. The barrier can also be used as a high performance radon membrane and/or damp proof membrane.

BBA certified - third party accreditation
Complies with NHBC Foundation’s NF94 guidance for use in Type A membrane locations
Complies with the methane gas transmission rate, mass per unit area and thickness requirements of BS 8485:2015 + A1:2019 - industry standard for methane and carbon dioxide protection
Flexible - easy to detail and install on site
Multi functional - also acts as a radon and damp proof membrane
Dual jointing methods - lap joints can be taped or heat welded
Not intended for use where there is a risk of hydrostatic pressure

Size

£502.86(incl. VAT)

£419.05(ex. VAT)

Quantity

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Available for Delivery (See Delivery Options Below)

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We make every effort to list all available colours, however we also offer a colour match service which can be accessed by contacting our Technical Team on 0113 245 5450 (option 2) or emailing [email protected]

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Description

Visqueen Gas Barrier is a multi-layer reinforced polyethylene gas barrier with a 20 micron aluminium foil. The barrier is coloured blue on the upper surface and silver on the reverse. The product is supplied in single wound rolls (not folded), 2m x 50m.

Radon, carbon dioxide, and methane protection - NHBC NF94 guidance:

Visqueen Gas Barrier when installed with either taped or welded joints complies with NHBC Foundation’s NF94 publication, Hazardous ground gas - an essential guide for housebuilders, in Type A membrane locations in precast suspended segmental subfloors and reinforced cast in situ concrete floor slabs (ground bearing, suspended or raft). For site or zone characteristic gas situations of CS4 and above, contact Rawlins Technical on 0113 2455450 (option 2) or send a message to [email protected].

Quick Links - Click To Jump To Section:

Approvals and Standards
System Components
Preparation
Installation
Usable Temperature Range
Additional Information

Approvals and Standards

Third party accreditation (BBA 13/5069)
Complies with the methane gas transmission rate, mass per unit area and thickness requirements of BS 8485:2015 + A1:2019
Suitable for all Characteristic Gas Situation (CS) ground gas regimes
Complies with NHBC Foundation’s NF94 guidance for use in Type A membrane locations
Conforms to the specification requirements of NHBC Amber 1 and Amber 2 applications
Conforms to the specification requirements of BR 211:2023
CE Mark EN 13967:2017
Quality Management System ISO 9001:2015
Occupational Health and Safety System ISO 45001:2018
Environmental Management System ISO 14001:2015

System Components

Preparation

Visqueen Gas Barrier should be installed on a smooth continuous surface e.g. grouted beam and block floor, a compacted blinding layer e.g. 50mm thick sand blinding, or smooth concrete blinding. The substrate should be free from irregularities such as voids or protrusions.

The barrier can be cut with a sharp retractable safety knife or robust scissors.

When installing the membrane in demanding site conditions, use Visqueen GR Lap Tape in place of Visqueen Gas Resistant Foil Lap Tape.

Installation

Visqueen Gas Barrier should be loose laid on the substrate with the blue side up so as to avoid sunlight glare.

The barrier should be clean and dry at the time of jointing. It should be overlapped by at least 150mm, bonded with Visqueen Pro Double Sided Jointing Tape and sealed with Visqueen Gas Resistant Foil Lap Tape. Alternatively lap joints can be heat welded to achieve an effective seal. The overlap in the barrier is typically 100mm and when hand welding, a 35mm weld is normally achieved.

When hand welding, a roller must be used.

Airtight seals should be formed around all service entry points. Visqueen Preformed Top Hat Units are recommended for sealing service entry pipes. The base of the top hat and the upstand should be bonded using VisqueenPro Double Sided Jointing Tape and sealed with Visqueen Gas Resistant Foil Lap Tape. The upstand should be secured with the supplied jubilee clip. Alternatively VisqueenPro Detailing Strip can be used to seal service entry points. The upstand should be secured with a jubilee clip.

Forming an effective barrier to gases may give rise to complex three-dimensional detailing where, it is recommended Visqueen Preformed Units are used e.g. corners. Alternatively VisqueenPro Detailing Strip can be used to seal awkward junctions. If the barrier is punctured or perforated a patch of the same material should be lapped at least 150mm beyond the limits of the puncture and bonded with Visqueen Pro Double Sided Jointing Tape and sealed with Visqueen Gas Resistant Foil Lap Tape.

vAlternatively a patch can be formed using VisqueenPro Detailing Strip and lapped at least 150mm beyond the extents of the puncture.

Long periods of exposure to ultraviolet light will reduce the effectiveness of the membrane. The membrane should be covered by a protective layer immediately after installation to prevent damage from following trades, ultraviolet light, etc. Care should be taken to ensure that the membrane is not punctured, stretched or displaced when applying a screed or final floor covering. A minimum thickness of 50mm screed is recommended. When reinforced concrete is to be laid over the barrier the wire reinforcements and spacers must be prevented from puncturing the barrier. Where there is a high risk of potential damage, the barrier should be covered with Visqueen TreadGuard protection, screed or other approved protection material before positioning the reinforcement.

See "data sheets" tab further above to download detailed drawings on:

Gas Barrier
- GB-01A Barrier Above Slab, Beam & Block Floor, External Masonry Cavity Wall
- GB-02A Barrier Above Slab, Beam & Block Floor, External Masonry Cavity Wall
- GB-03A Barrier Above Slab, Beam & Block Floor, External Masonry Cavity Wall
- GB-04 Edge Detail Raised Floor
- GB-06 Internal Wall House To Garage
- GB-07 Stepped Slab Gas Protection
- GB-09A Barrier Above Slab, Beam & Block Floor, Masonry Party Wall
- GB-10 Robust Detail Internal Cavity Wall
- GB-12 Mobility Threshold
- GB-13A Barrier Above Slab, Beam & Block Floor, External Light Gauge Steel Frame Wall
- GB-14 Barrier Above Slab, Beam & Block Floor, External Light Gauge Steel Frame Wall
- GB-15 Barrier Above Slab, Beam & Block Floor, Internal Masonry Wall
- GB-16 Barrier Above Slab, Beam & Block Floor, Internal Masonry Wall Built Off Floor
- GB-21A Barrier Below Slab & Insulation, Cast In Situ RC Ground Bearing Slab, External Masonry Cavity Wall
- GB-29B Barrier Below Slab, Cast In Situ RC Slab, External Light Gauge Steel Frame Wall
- GB-51 Service Pipe Top Hat
- GB-61 Barrier Above Slab, Beam & Block Floor, External Masonry Cavity Wall at Telescopic Vent Location
- GB-62 Barrier Below Slab & Insulation, Cast In Situ RC Ground Bearing Slab, External Masonry Cavity Wall
- GB-63 Barrier Above Slab, Beam & Block Floor, External Light Gauge Steel Frame Wall
- GB-81 Service Pipe Detailing Using VisqueenPro Detailing Strip, Step By Step
- GB-82 Steel Column Detailing Using VisqueenPro Detailing S
Membrane Joining
- JD-08 Hand Welded Lap Joint Detail
Tanking Systems
- TGB-05 Rev 0 Typical Lift Pit Detail With Gas Protection
- TGB-06 Rev 0 Typical Lift Pit Detail With Gas Protection
- TGB-52 Rev 0 Typical Edge Detail With Gas Protection - Ring Beam

Usable Temperature Range

It is recommended that Visqueen Gas Barrier and all associated system components should not be installed below 5°C.

Additional Information

When used in accordance BS8485:2015 + A1:2019 a subfloor ventilation system or pressure relief maybe required
Where hydrocarbon or VOC contamination is present use Visqueen Ultimate HC Blok or Ultimate GeoSeal gas protection systems
To assist build sequencing, Visqueen Ultimate Gas DPC is available for gas protection through the wall constructions
For suspended beam and block floor detailing see GB-01
For internal and external corners Visqueen Ultimate Preformed Units should be used see PFU-553
To seal around steel columns use VisqueenPro Detailing Strip see GB-52
For additional detailing information, contact Rawlins Technical 0113 2455450 (option 2) or send a message to [email protected]

Product Details

Reference 11466-1008491

Data sheet

For Use By: Consumer Use
Interior / Exterior Use: Interior Use
For Use On: Concrete Floor Slabs
Above Precast Suspended Segmental Subfloors
Beam and Block Floor System
Min. Application Temperature: 0°C
Suitable For Use On: Beam and Block Floor System
Suitable For Use On: Concrete Floor Slabs
Suitable For Use On: Above Precast Suspended Segmental Subfloors
Usages: Gas Protection Systems
Product Usage Type: Gas Barrier
Industry Approved System: BBA

Attachments

Download

Product Data Sheet

Download

Safety Data Sheet

Download

Declaration of Performance

Download

ISO9001

Download

ISO14001

Download

ISO45001

Download

Gas Barrier Detailed Drawings

Download

Membrane Joining Detailed Drawings

Download

Tanking Systems Detailed Drawings

Download

GB-01 Drawing

Download

PFU-553 Drawing

Download

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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IMPORTANT SHIPPING & DELIVERY INFORMATION

Visqueen Gas Barrier is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT

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Visqueen Gas Barrier

Visqueen Gas Barrier

Quick Links - Click To Jump To Section:

Approvals and Standards

System Components

Preparation

Installation

Usable Temperature Range

Additional Information

Data sheet

Questions

Question about the product

IMPORTANT SHIPPING & DELIVERY INFORMATION