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GAS PROTECTION SYSTEMSVisqueen HYDROCARBONPROTECTION SYSTEM——Low Permeability to Hydrocarbon substances and vapours.——High quality single layer HDPE.——Excellent puncture and tear resistance.——Complies with current codes of practice.——Also acts as a DPM.DESCRIPTIONVisqueen GX Geomembrane is a highquality single layer HDPE membrane andis suitable for use as a barrier membraneon brownfield sites that require protectionfrom dangerous contaminants suchas hydrocarbons and methane. Dueto the membrane's high puncture andimpact resistance the Visqueen GXGeomembrane generally requires noprotective screed or boarding whenlaying reinforced concrete above it. TheVisqueen GX is also suitable as a highperformance damp proof membrane.APPLICATIONVisqueen GX Geomembrane offers a safesolution for the protection of buildings andoccupiers against all levels ofhydrocarbons, methane, carbon dioxideand radon ingress. Typically these are sitespreviously used as petrol stations,coalfields, landfill sites or arecontaminated industrial sites.Technical SupportDue to the wide variety ofhydrocarbon contaminants found, westrongly recommend the use of theVisqueen Building Products TechnicalSupport Team at an early designstage so that the most appropriatedetailing and material specificationsare adopted. A full technicaldatasheet is available onlinewww.visqueenbuiding.co.uk/gasInstallation GuidelinesVisqueen GX and ancillary componentsmust be installed in accordance withthe recommendations of BuildingResearch Establishment BRE 414“Protective measures for housing ongas contaminated land” and CIRIAC665 “Assessing risks posed byhazardous ground gases to buildings”,NHBC guidelines, Chartered Instituteof Environmental Health Ground GasHandbook and CIRIA C682 the VOCHandbook.The Visqueen GX system is suitablewhere hydrostatic pressure is present,however in this application the jointsmust be welded and not taped. Themembrane should be installed on ablinded or smooth surface allowingadequate overlap for jointing betweenthe sheets and avoiding bridging (i.e.areas of unsupported membrane).In areas where high levels ofunsupported membrane occur it isrecommended that Visqueen GX PreApplied Membrane is used. To avoidlinear expansion due to temperaturechange the membrane should NOTbe taken through any masonry wall.In order to provide a continuousbarrier across the cavity VisqueenGX DPC should be taken through theblockwork and incorporated below thedamp proof course cavity tray in theouter leaf.When a welded joint system is beingused, punctures to the membrane canonly be repaired by welding a patchof membrane with identical thicknessand lapped at least 150mm beyondthe limits of the puncture. Wherethis is not possible and the threedimensional shapes are complex itis recommended a preformed unitis used.To avoid high linear expansionwhen installed in hot weather,the membrane should be coveredimmediately after installation withconcrete or screed.VentilationWhen medium to high levels ofground gases are present or whenthe generation of gases still occurs,then an open void beneath theground floor should be constructed asventilation beneath the ground floorwill dilute and disperse the gases toatmosphere. Open voids are normallyrestricted to beam and block floors orother precast concrete floor systems.An alternative for providing ventilationto in situ concrete floor slabs is toinstall a Visqueen Ventilation System.See page 50 for further details.36
CPDP53P20REQUIRED COMPONENTSAVAILABLE AS A DOWNLOAD FROMVISQUEENBUILDING.CO.UK/GASVISQUEEN GX JOINTING SYSTEMVISQUEEN GEOCOMPOSITE VENTING SYSTEMVISQUEEN GX DPCSPECIFICATION SUPPORTTHE FOLLOWING ITEMS ARE AVAILABLETO VIEW ONLINE OR TO DOWNLOAD FROMVISQUEENBUILDING.CO.UK/GASCPDH&STECHNICAL DATASHEETSTYPICAL INSTALLATION CAD DETAILSHEALTH & SAFETY DATACPD H&S NBSH&SH&S NBSMANUFACTUREDIN THE UKDIMENSIONSGX GeomembraneGX GeomembraneGX Jointing SystemGX Geocomposite Venting SystemPreformed Top Hat UnitsGX DPCPreformed DPC Internal & External Corner Units1.0mm x 2.95m x 30m (88.50m 2 ) Standard Roll1.5mm x 2.95m x 25m (73.75m 2 ) Standard RollTwo part jointing system25mm & 50mm venting matsFor sealing around service pipe penetrations645mm / 970mm x 30m Roll A flexible reinforced DPCdesigned to prevent the transmission of hydrocarbon gasesthrough the cavityTo form an effective seal at cornersTECHNICAL DATA1mm1.5mmDensity (ASTM D1505) 941kg/m 3 +/- 1% 941kg/m 3 +/- 1%Thickness (BS2782-630A) +/- 5% +/- 5%Melt Flow Index (ASTM D1238)
Page 4 and 5: THE VISQUEEN Specifier's GUIDEThe V
Page 6 and 7: IMAGE ILLUSTRATES HIGH IMPACT STREN
Page 8: DAMP PROOF COURSESVisqueen Zedex CP
Page 14 and 15: DAMP PROOF COURSESVisqueen Preforme
Page 16 and 17: DAMP PROOF COURSESVisqueen Zedex HO
Page 18 and 19: DAMP PROOF COURSESVisqueen POLYETHY
Page 20 and 21: DAMP PROOF COURSESVisqueen GX HYDRO
Page 23 and 24: 26 Visqueen 100% Recycled Ecomembra
Page 25 and 26: Innovation and Investmentin Recycli
Page 27 and 28: P8REQUIRED COMPONENTSAvailable as a
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Page 32 and 33: What gases andcontaminants are invo
Page 34: The Complete Solution- Visqueen’s
Page 41 and 42: GAS PROTECTION SYSTEMSVisqueen Gas
Page 45 and 46: CPDP53P88P8P60REQUIRED COMPONENTSAV
Page 48 and 49: GAS PROTECTION SYSTEMSVISQUEEN RADO
Page 50 and 51: visqueen Gasventing systemBackgroun
Page 52 and 53: GAS PROTECTION SYSTEMSSystem Design
Page 54 and 55: GAS PROTECTION SYSTEMSGEOCOMPOSITE
Page 56 and 57: IMAGE ILLUSTRATES INSTALLATION OF T
Page 58 and 59: tankingVisqueen Self Adhesivedamp p
Page 62 and 63: tankingVisqueen torchon tanking Mem
Page 64 and 65: tankingVisqueen GX Pre Applied Memb
Page 66 and 67: PROTECTA-DRAINtankingVisqueen Prote
Page 69 and 70: 70 Visqueen Urban Drainage Geomembr
Page 71 and 72: REQUIRED COMPONENTSAVAILABLE AS A D
Page 73: Aquaflow SC Membrane Aquaflow SC Me
Page 76 and 77: VAPOUR CONTROL LAYERSVisqueen VAPOU
Page 83: 84 Lapping & Jointing86 Service Pip
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INSTALLATION ADVICESealing to cavit
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WWW.VISQUEENBUILDING.CO.UK | 0845 3
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mmx50m mmx33m 100mmx33m 150mmx10m 7
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FLOOR PROTECTIONwww.visqueenmegafil
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www.visqueenmegafilm.co.ukMEGABOARD
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EnvironmentalLandscapeSolutions
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Key Sectors;LandscapingUsed widely
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Project:Prendergast CP NewSchool 20
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P70 Visqueen URBANDRAINAGEGEOMEMBRA
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