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CI/SfB (13.9) Uniclass L681August 2013

GROUND FLOOR PROTECTIONGAS and DAMP BARRIERS

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Vertical cavity barriers

Abutment cavity traysand AluFlash flashings

Arch formers and trays

Bullseye window trays

Ground floor gas and damp protection

Horizontal cavity barriers

Insulated cavity closers

Chimney cavity trays

Horizontal cavity traysand AluFlash flashings

Z-Led complete ground floor protectionThe Z-Led range offers complete protectionfor ground floors against both damp andgases from the ground. This double functionavoids the need for a damp-proof membranein addition to a gas-tight membrane.

Purpose-designed accessories make it easy toensure reliable and continuous protectionacross wall cavities and at corners, columns,pipe penetrations etc. The range also includescomponents for ventilation of underfloorspaces where provided.

The Z-Led product rangeThe illustration below shows typicalapplications of Z-Led products.For cavity trays, cavity closers and cavitybarriers please see separate brochures.

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The Z-Led Product Range 2

Introduction 3

Technical requirements 4

Barrier membranes 6Protect GDB10 PLUS, Radon 1200 and Self adhesive gas resistant dpc/membrane

Preformed accessories 8for edges, corners, pipe penetrations etc

Underfloor and cavity 9wall vents

Application details 10

Specification clauses 11

Further Information 12

The requirementHarmful ground gases entering buildingscan pose health risks. Damp can similarlycause health problems and also damage tothe building fabric.

Protective measures are therefore usuallyrequired in ground floors, and theserequirements are enshrined in buildingregulations (see Technical requirements).

Government planning policy requires anincrease in the amount of housing onbrownfield land. This means that muchmore housing will need protection fromground gases.

Current high levels of thermal insulationand modern construction methods requireventilation within the building fabric toprevent the build-up of moisture andcondensation.

The Z-Led complete solutionZ-Led ground floor protection products offera complete solution;

● A continuous impermeable protectivebarrier against gases from the ground anddamp penetration.

● A single barrier avoiding the need for anadditional damp-proof membrane.

● Continuity of protection at edges andpenetrations by means of purpose-designed accessories.

● Ventilation of underfloor spaces and wallcavities to remove gases and moisturevapour where required.

● Easy and reliable installation usingpreformed components.

● Can be used for solid ground floor slabsand for suspended concrete or timberfloors.

● Can be used to meet the requirements ofBuilding Regulations in the UK andIreland (see Technical requirements).

CertificationThe performance of Z-Led Protect GDB10PLUS membrane has been independentlyassessed and certified by BM TRADACertification for use in ground floors ofbuildings as a barrier against harmful gases(radon, methane and carbon dioxide)and damp penetration. Certificate numberCPS-003.

CPS-003

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TECHNICAL REQUIREMENTS

GROUND FLOOR PROTECTION, GAS AND DAMP BARRIERS

Harmful soil gasesHarmful soil gases such as methane, carbondioxide and radon can enter properties byname different routes: through cracks infloors and walls, construction joints, wallcavities, and around services pipes.

Methane is a colourless, odourless, explosive and asphyxiating gas.

Carbon dioxide (CO2) is a colourless, odourless, non-flammable,asphyxiating and toxic gas.

Methane and carbon dioxide can arise from landfill sites, mineworkings, and organic-rich soils such as peat or river silt.

Radon is a naturally-occurring colourless, odourless radioactive gas;some parts of the country have higher levels than elsewhere.Exposure to high levels of radon for long periods increases the risk ofdeveloping lung cancer.

Building Regulations (England and Wales)Protection against ground contaminants andmoisture are specific requirements of theBuilding Regulations Part C for England andWales. The relevant requirements are:

Approved Document CSite preparation and resistance tocontaminants and moisture

‘Preparation of site and resistance tocontaminants C1 (2) Reasonable precautionsshall be taken to avoid danger to health andsafety caused by contaminants on or in theground covered, or to be covered by thebuilding and any land associated with thebuilding.’

‘Resistance to moisture C2 The floors, wallsand roof of the building shall adequatelyprotect the building and people who use thebuilding from harmful effects caused by:(a) ground moisture(c) interstitial and surface condensation.’

Gases from the groundInformation on methane and other gases isgiven in paragraphs 2.25 - 2.35.Gas control measures are given in 2.36 -2.38. For dwellings these should consist of agas resistant barrier across the wholebuilding footprint, above an extraction orventilation layer from which gases can bedispersed and vented to the atmosphere.

HydrocarbonsGround contaminated with hydrocarbonssuch as diesel or motor oils may alsogenerate harmful emissions (not specificallycovered by Approved Document C). Testingfor these is extremely difficult, therefore Z-Led recommend that in such cases aventilated sub-floor void is provided inaddition to a barrier membrane.

Gas entry routesinto buildings

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Building (Scotland) Regulations

Site preparation3.1 Every building must be designed andconstructed in such a way that there will notbe a threat to the building or the health ofpeople in or around the building due to thepresence of harmful or dangeroussubstances.

Harmful or dangerous substancesHarmful or dangerous substances includedeposits of faecal or animal matter and anysubstance, or mixture of substances, whichis, or could become, corrosive, explosive,flammable, radioactive or toxic or whichproduces, or could produce, any gas likely tohave any such characteristic.

Moisture from the ground3.4 Every building must be designed andconstructed in such a way that there will notbe a threat to the building or the health ofthe occupants as a result of moisturepenetration from the ground.

3.1.6 Risk management techniquesThere are a range of options for managingthe risk of land that is contaminated. Thiscan include removal or treatment of thecontaminant source or breaking the pathwayby which contaminants can present a risk toreceptors:…

Sealing means that an impermeable barrieris laid between the contaminant and thebuilding and sealed at the joints, around theedges and at the service entries.

Detailed guidance is given inBRE/Environment Agency Report BR 414Protective measures for housing on gas-contaminated land.

Radon protectionAll new buildings, extensions andconversions in areas where there may beelevated radon emissions may need toincorporate precautions.

3.2 Every building must be designed andconstructed in such a way that there will notbe a threat to the health of people in oraround the building due to the emission andcontainment of radon gas.

Radon protective measures should beprovided in accordance with the guidancecontained in BRE publications BR 211Radon: guidance on protective measures fornew dwellings, and BR 376 Radon: guidanceon protective measures for new dwellings inScotland.

CIRIA C665 and NHBC Traffic LightsProtect GDB10 PLUS complies with theNHBC Traffic Lights* and CIRIA C665, wheninstalled as prescribed in BRE 414. (*ForAmber 2 or worse the membrane shouldalways be fitted by a specialist contractor)

Building Regulations (Northern Ireland)Protection against ground contaminants andmoisture are specific requirements of theBuilding Regulations Part C for NorthernIreland. The relevant requirements are:

‘Preparation of site and resistance todangerous and harmful substances C2 (1)The site of a building and the groundadjacent to it shall be prepared and treated,and measures shall be taken, so as toprevent, as far as reasonably practicable, anyharmful effect on the building or the healthor safety of the occupants caused by:b) dangerous or harmful substances.

2) Without prejudice to the generality ofparagraph (1) measures shall be taken toprevent or limit the ingress of radon fromthe ground into any dwelling.’

‘Resistance to ground moisture and weatherC4 Every wall, floor and roof shall beconstructed so as to prevent any harmfuleffect on the building or the health of theoccupants caused by the passage of moistureto any part of the building from:a) the ground.’

Building Regulations Republic of IrelandProtection against ground contaminants andmoisture are specific requirements of theBuilding Regulations Part C. The relevantrequirements are:

‘Dangerous Substances C3 Reasonableprecautions shall be taken to avoid danger tohealth and safety caused by substances(including contaminants) found on or in theground to be covered by a building.’

‘Resistance to weather and ground moistureC4 The floors, walls and roof of a buildingshall be so designed and constructed as toprevent the passage of moisture to the insideof the building or damage to the fabric of thebuilding.’

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GROUND FLOOR PROTECTION, GAS AND DAMP BARRIERS

RADON 1200 DAMP PROOF MEMBRANE

Radon 1200 is satisfactory for use in concretefloors which are not subjected to a hydrostaticpressure, in accordance with the relevantclauses of CP 102: 1973.

The membrane can be installed either as anoversite membrane, situated between ablinded hard core bed and the base concrete,or as a sandwich membrane in base concreteor between the base concrete and the screed.

The membrane meets the requirements foruse as a gas control membrane against radonor on gas-contaminated land generally inaccordance with the recommendationspublished by the Building ResearchEstablishment (BRE 211) and the nationalBuilding Regulations. The membranes may beused with both unreinforced and reinforcedconcrete ground supported slabs. The use ofreinforced concrete slabs is only necessarywhere, in the opinion of the designer, there isa risk of settlement and cracking of the slaboccurring.

Composition, sizes1200 gauge extruded polyethylene withnominal characteristics of:

Roll weight: 27.6kgStandard roll length: 25mStandard roll width: 4m

Performance and test methods: Protect GDB10 PLUS

MD (along roll) CD (across roll)

Nail tear strength (N) to BS EN 12310-1 modified 441 401

Tensile strength (N/50mm) to BS EN 12311-1 modified 783 670

Elongation (%) to BS EN 12311-1 modified 25 15

CBR Puncture Resistance (N) to BS EN ISO 12236 1684

Methane permeability based on BS EN 374-3 < 1.5 ml/m2/day

Carbon dioxide (CO2) permeability to BS EN 374-3 < 1.0 µg/cm2/min

Radon permeability 4.2 x 10-12m2/s

Radon transmittance 21 x 10-9m/s

Water penetration resistance to BS EN 1928

Method A modified Pass Class W1

PROTECT GDB10 PLUS GAS & DAMPBARRIER MEMBRANE

Z-Led Protect GDB10 PLUS is a universalbarrier membrane for protection of newbuildings against gas and damp penetrationfrom the ground.

Used as an oversite membrane below floorslabs or suspended floors, in conjunctionwith Z-Led Cavity and Slab Edge ProtectionSystem, it provides a complete solutionwhen installed in accordance with BREReport BR 414.

● Excellent resistance to harmful soil gasesand damp penetration.

● Enables Building Regulations Part C to bemet by reference to Approved Document C,see Technical requirements.

● No additional damp-proof membranerequired.

● Tough and durable, excellent tensilestrength, puncture and tear resistance.

● Easily installed: easy to cut, lightweightand clean to handle.

● Each roll supplied with fixing instructions.

● Full range of accessories and underfloorventilation products.

Composition, sizeMulti-layer reinforced polyethylenemembrane with an integral continuousaluminium foil.

Roll length: 40mRoll width: 2.5mBasis weight: 145kg/m2

Roll weight: 17.5kg

Cavity Barrier andcombined Cavity Tray

Protect GDB10 PLUSMembrane

Slab EdgeProtection Tray

Three Z-Led barrier membranes areavailable:

● Protect GDB10 PLUS provides protectionagainst methane, carbon dioxide andradon as well as damp.

● Protect Radon 1200 is also for use againstradon and damp.

● Self adhesive gas resistant dpc / membraneis used for sealing around columns,concrete slabs etc.

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SELF ADHESIVE GAS RESISTANTDPC / MEMBRANE

An adhesive backed gas resistant membranespecifically designed for use with ProtectGDB10 PLUS gas and damp barrier forsealing around columns, concrete slabs, etc.

The very high initial adhesion allows easyand instant lamination to a wide variety ofsubstrates including concrete, steel andmasonry.

Features

● Excellent resistance to harmful soil gasesand damp penetration

● High adhesive properties

● Versatile, can be used to form columncloaks

● Easily shaped to form a gas proof cavitybarrier

● Tough and durable

● Excellent tensile strength

● Puncture and tear resistant

Composition, sizesTriple ply construction including a toughpolywoven core layer with a bright highpurity aluminium foil which is bonded witha 0.8mm pressure sensitive modified acrylictransfer tape with siliconised paper releaseliner.

Weight: 309g/m2

Roll sizes: 20m roll lengths in 150mm,300mm, 450mm and 600mm widths

ApplicationThe surface to be bonded must be clean, iefree of dust, release agents, processing oilsand grease. The temperature of theapplication should not be below the dewpoint of the surrounding air. The warmer thetape the better the immediate adhesion willbe. A dedicated primer is also available forfibrous or very porous applications.

Property Test description Declared Limiting Unaged

Thickness EN 1848 -2 0.17m

Mass per unit area EN 1849-2 309g/m2 302g/m2 307g/m2

Tensile strength EN 12311-2

MD (N/50mm) >550 >500 (Mean) 783

CD (N/50mm) >550 >500 (Mean) 670

Tensile elongation EN 12311-2

MD (%) <20 <25 24

CD (%) <20 <25 14

Resistance to tearing (nail shank) in: EN 12310-1MD (N) >500 >480 >480

CD (N) >500 >480 >480

Water vapour resistance EN 1931 >589MNs/g

Water vapour diffusion equ. air layerthickness EN 1931 Sd>117m Sd>117m

Water penetration resistance EN 1928 Unaged W1 W1 W1 pass

Aged W1 W1 W1 pass

Radon permeability (K) 4.2 x 10-12m2/s

Radon transmittance (P) 21 x 10-9m/s

Methane permeation BS 903: Part A30

Modified by INSPEC <1.5ml/m2/day

Low temperature flexibility of EN 1109 No cracking at -40°C No cracking at -40°Cmembrane on unrolling

Performance and test methods: Self-adhesive gas-resistant DPC/membrane

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GROUND FLOOR PROTECTION, GAS AND DAMP BARRIERS

A comprehensive range of preformedaccessories is available for use withmembranes to maintain protection at wallcavities, corners, pipe and service entries etc.

Design of components removes the need toform difficult shapes on site, giving a simplerand more reliable installation.

Radon Cavity Barrier and combined Cavity TrayOne size fits wall cavities from 50 to 100mmwide.Also suits 150mm deep suspended floors.Other sizes available to special order.Sparked finish surface promotes mortaradhesion and prevents the creation of slipplanes in masonry.Supplied in 25m or 50m rolls.

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Self adhesive Periscope CloakMaintains continuity by providing apreformed cloak to seal around the verticalsection of a periscope vent where such a ventpasses through a cavity barrier.1.5mm four-ply construction comprising: a woven polypropylene layer; an LDPE layerwith aluminium foil; a second LDPE layer;and a polypropylene film.

RS Radon SumpInstalled within fill material in underfloorvoids to collect radon gas and vent it byconvection through a vertical pipe.

The Periscope Cloak is supplied flat; folded foruse on site as shown

Jointing tapeGas Jointing Tape and Joint Protection Tapefor making joints in membranes andbetween membranes and other components.Available in roll widths of 12, 30 and 50mm.

Where extra high adhesion is required,Transfer tape with a pressure-sensitivemodified acrylic adhesive is available for useas a general mounting tape.

RS22 Slab Edge Universal CornerPreformed unit which is reversible forexternal or internal corners.For slab thicknesses: RS22/100 for 100mm,RS22/150 for 150mm.

RSE Radon Slab Edge Protection TrayDesigned to accommodate slab thicknessesof 100 or 150mm.Supplied in 25m or 50m rolls.Other sizes available to special order.

Cavity Barrier Universal CornerPreformed unit which is reversible forexternal or internal corners.150mm deep as standard. Other sizesavailable to special order.

RPS1 Universal Pipe SealSeals around service pipes which penetrate the membrane.To fit pipe/sleeve diameters as follows:RPS1/110: 100 to 120mm.RPS1/130: 130 to 140mm.RPS1/160: 150 to 160mm.

Bespoke fabrications available to specialorder.

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The Z-Led range of underfloor and cavitywall ventilation products enable theregulatory requirements for ventilation to bemet.

● Adaptable to a wide range of situationsincluding different floor depths andremote voids.

● Also provides protection against the entryof driving rain, birds, rodents and largeinsects.

ZLAB AirbrickVentilation area 6000mm2

Standard brick face dimensions.Can be stacked in multiples.Driving rain resistant.Can be used with ZLPS Periscope and ZLPAVent Pipe Adaptor.Colours: terracotta, buff, anthracite.

ZLPS PeriscopeProvides ventilation beneath suspendedfloors.Vertical adjustment for 3-4 brick courses.Suitable for cavity widths from 50mm to100mm.Can be used with ZLAB Airbrick, ZLVSVertical Sleeve and ZLPA Vent Pipe Adaptor.

ZLPA Vent Pipe AdaptorEnables remote voids to be ventilated viaconnection to 100mm internal diameterpipe.Can be attached to ZLAB Airbrick and ZLPSPeriscope.

ZLVS Vertical SleeveFits between two halves of ZLPS Periscope toincrease overall depth adjustment up to 5-6brick courses.Modular design allows additional units to beadded for even greater depths.

HT Airbrick Cavity TrayInstalled above an airbrick to protect thewall cavity against damp penetration inaccordance with BS 8215: 1991.Short length for ease of installation whilstproviding 100mm extension on each side ofairbrick.

MV650 WeepventCavity wall ventilator and weep unit in oneinnovative product.Fits into a single perpend joint.Ventilation area 220mm2.Driving rain resistant and protects againstlarge insect ingress.Colours: terracotta, buff, grey.Can be used in brickwork, blockwork,timber-framed and rendered walls.

InstallationUnderfloor vent spacingLocate underfloor vents on opposite sides ofthe building to achieve the most effectivemix and distribution of air flow.

Installed at 4.0m centres they will provide1500mm2 ventilation area per metre ofexternal wall to comply with BuildingRegulations Approved Document C.

However Z-Led recommend spacing at 2.0mcentres to avoid the risk of stagnant airpockets and consequent risk ofaccumulation of gases.

Cavity traysBS 8215: 1991 recommends use of cavitytrays above any point where a wall cavity isbridged. Z-Led HT or HTR cavity trays withstopends and weepvents should be usedabove ZLAB Airbricks and ZLPS Periscopes.

WeepventsWeepvents should be installed on all cavitytrays at 450mm centres.

For timber frame wall cavity ventilation,install at a horizontal spacing of 450mmcentres, at low and high level and above andbelow fire stops in a staggered layout.

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Exposed edge protected by Z-Led 50mmfoil-faced Joint Protection Tape

Protect GDB10 PLUSmembrane

Z-Led 50mm double-sided Gas Jointing Tape

Z-Led 50mm foil-facedJoint Protection Tape

Z-Led polypropylene Slab Edge Protection Tray

Alternatively the joint canbe formed using 150mm gasresistant tape

Service pipe penetration of membrane

Wall ventilation

MV650 used as weep or ventilator

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Slab and edge protection

Radon ventilation

Slab edge and cavity wall

Protect GDB10 PLUS membrane jointing

Blinded substrate

12 x 2mm butyl strip

Z-Led 50mm foil-facedJoint Protection Tape

Jubilee clamp

Z-Led RPS1 UniversalPipe Seal

Ventilation of underfloor void with porous fill

Radon laden air escapingnaturally by convection

Z-Led RPS1 Universal Pipe Seal

Protect GDB10 PLUSmembrane

RS Radon Sump

Porous fillmaterial

12 x 2mm butyl strip

Z-Led MV650 Universal Weep Vent at maximum 450mm centres

Z-Led polypropylene Cavity Barrier and combined Cavity Tray

Z-Led 50mm double-sidedGas Jointing Tape

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Specification clausesGas/damp protectionProvide combined gas anddamp protection to groundfloors to comply withBuilding RegulationsApproved Document C bymeans of :Z-Led Protect GDB10PLUS membrane(methane, carbon dioxide,radon) / Protect RadonShield membrane (radononly)Z-Led Edge and CavityProtection SystemZ-Led Underfloor andcavity wall vents allsupplied by Z-Led Ltd, 2 Brooklands Road, Sale,Cheshire, M33 3SS.Tel: 0161-905 5700,Fax: 0161-905 2085, Email: info@z-led.com.

Z-Led Protect GDB10PLUS membrane / ProtectRadon Shield membraneLay membrane directly ona suitable blindedsubstrate. Overlap joints bya minimum of 150mm andseal using Z-Led 50mm wide double-sided Gas Jointing Tape.Protect the exposed edge ofthe joint by taping to theunderlying layer using Z-Led 50mm wide foil-faced Joint ProtectionTape. Alternatively thejoint can be formed using150mm gas resistant tape.Sleeve service pipepenetrations using Z-LedRPS1 pipe seals, lapped andsealed to the membrane asabove.

Z-Led Edge and CavityProtection SystemEnsure continuity of gasand damp barrier at allexternal walls by installingZ-Led Slab Edge ProtectionTray sealed to themembrane using Z-Led50mm wide double-sidedGas Jointing Tape.Alternatively the joint canbe formed using 150mmgas resistant tape.Provide continuous gasand damp protection in thewall cavity by installing Z-Led polypropylene CavityBarrier and combinedCavity Tray. Seal Z-LedSlab Edge Protection Trayto the top of the CavityBarrier tray using Z-Led12mm wide double-sidedGas Jointing Tape. Site Z-Led MV650 universalweep ventilators directlyon the Cavity Barrier trayin the external masonryleaf at maximum 450mmcentres around thebuilding perimeter.

Z-Led Underfloor andcavity wall ventsProvide ventilation tounderfloor voids by meansof Z-Led Underfloor andcavity wall vents installedin accordance withmanufacturer’sinstructions.

Z-Led Radon SumpInstall Z-Led Radon Sumpwithin porous underfloorfill material with verticalpipe venting in accordancewith manufacturer’srecommendations.

ZLPS Periscope

ZLAB Airbrick

Membrane

Solid floor with ventilation

Timber Frame detail

Underfloor ventilation

ZLAB Airbrick

MV650

MV650

MV650

ZLPS Periscope

Self adhesive Periscope Cloak

RSE Radon Slab Edge Protection Tray

RSE Radon Slab Edge Protection Tray

Radon/damp proof membrane

Z-Led polypropylene Cavity Barrier and combined Cavity Tray

Membrane

Z-Led polypropylene Cavity Barrier and combined Cavity Tray

RSE Radon Slab Edge Protection Tray

2 Brooklands Road, Sale, Cheshire M33 3SS Tel: 0161-905 5700 Fax: 0161-905 2085

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Environment / Operational InformationAs part of our commitment to minimisingour impact on the environment, and tocontinuous improvement in our methods ofoperation, Z-Led is accredited to ISO14001Environmental Management, OHSAS 18001Health and Safety Management and ISO9001 Quality Management Systems.

Technical supportZ-Led offer a full technical advisory andestimating service. Contact our TechnicalServices Department on 0161-905 5700 forfurther information or to request a completeschedule and quotation covering all productsrequired.

Other Products Z-Led market a range of other productsincluding:

Cavity Trays, Preformed DPCs and AluFlashFlashings

Insulated Cavity Closers

Horizontal and Vertical Cavity Barriers

Z-Led Limited2 Brooklands Road, Sale, Cheshire M33 3SS. Telephone: 0161-905 5700 Fax: 0161-905 2085

Email: info@z-led.com Web: www.z-led.com

Z-Led Limited maintains a policy of continuous development and reserves the right to amend product specifications without notice.

A member of the Building Product Design Group

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