External Wall

Insulation Systems

Refurbishment

The external appearance of a building is trulyan important aspect, especially to itsresidents, yet increasingly, with the rapid

depletion of the world's energy resources, highprofile environmental issues, such as climatechange, are beginning to take precedence overaesthetic preferences and stringent legislationdemands that the thermal performance of anybuilding is strictly governed.

External wall insulation was introduced to Britainin the 1960's, yet it would be fair to say that it hastaken time to establish itself. However, over thelast ten years, the Decent Homes Standards andPart 'L' of the Building Regulations havesignificantly increased insulation standards andthe demand for more innovative solutions forrenovating properties, helping to increasethermal performance and reducing carbonemissions.

What is EWI ?

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Did you know that over a third of the energyrequired to heat a property escapesthrough the external walls? External Wall

Insulation is the perfect solution to this problem.

The system involves the mechanical and / oradhesive fixing of insulation boards to the outsideof a building, which is covered with a meshreinforcement, a base coat and a final decorativefinish. This layered method encases the propertyand helps prevent heat from escapingunnecessarily and allows it to be contained withinthe property.

All of the WBS systems allow architects toconfidently specify a range of flexible buildingsolutions that not only conform to currentregulations and energy standards, but whichoffers a wide choice of final finishes to fully meetthe clients aesthetic expectations.

The logical choice for energy efficiency

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A cost effective alternative to demolition

& rebuilding

Reduces unnecessary heat loss &

condensation

Protects and prolongs the external fabric

of the property

Offers high impact and weather

resistance

Low maintenance

Minimises inhabitant disruption

Does not reduce living space

30 year life expectancy

Environmentally friendly

BBAcertified

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What are the benefits?

External Wall Insulation Systems notonly improve insulation values, butalso help to reduce heating bills and

carbon emissions.

For properties in need of refurbishment, theyand are a flexible, cost-effective alternative todemolition. In addition, because all WBSsystems are designed to be strong andweatherproof, water ingress and dampnessare eradicated.

'Creating sustainable communities for tomorrow doesn't meanwe have to clear away decent neighbourhoods today.'

WBS EWI Systems

Before After

Insulant Types

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The current building regulations require insulated buildings to have a 'U' value below 0.35 W/m²K, this will beimproved upon again during 2006. Below, you will find the most currently specified insulants along with theircurrent 'K' values.

INSULANT THICKNESS K VALUE

Polystyrene SD/FRA Grade 10mm - 160mm 0.036 - 0.038 W/m²K

Polyisocyanurate (PIR) 20mm - 90mm 0.027 W/m²K

Mineral Wool 20mm - 180mm 0.036 W/m²K

Lamella 20mm - 140mm 0.036 W/m²K

Phenolic 0mm - 24mm 0.024 W/m²K

Phenolic 25mm - 44mm 0.023 W/m²K

Phenolic 45mm - 120mm 0.021 W/m²K

EPS

PHENOLIC

MINERAL FIBRE

PIR

All values correct at time of printing. Please contact WBS TECHNICAL SUPPORT for further details.

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In simple terms, a U-Value is the measurement of the rate of heat loss through a structure by calculatingthe thermal properties of each component of the building. Therefore, in all aspects of property design itmakes perfect sense that the lower the U-value achieved - the less energy is required to keep thebuilding warm and dry.

Take the following calculations as an example:

U-Values explained

Twenty years ago, the use of externalinsulation and render on buildings in the UKwas almost non-existent. Thousands of

homes and commercial buildings, of bothtraditional and non-traditional construction, werebuilt in the last century with no regard given totheir insulation value, now making them difficultand expensive to heat.

The gradual onset of damp and condensation hassince lead to internal and external deteriorationand has had a direct affect on various healthissues affecting residents.

Today, more and more local authorities, housingassociations and private customers are choosingExternal Wall Insulation as a cost-effective andflexible method of renovating social housing thatis in desperate need of thermal and aesthetical

Domestic & Commercial Refurbishment

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upgrading, with an aim to cutting CO emissionsand unnecessarily wasted energy in an attempt toreduce adverse affects these issues are havingon the environment.

External Wall Insulation can be applied to a widevar ie ty o f domest ic and commerc ia lrefurbishment types including:

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Single skin brickwork / blockwork

Solid concrete

Steel, concrete or timber frame

(see our system)

Traditional housing

Non traditional housing & PRC Properties

EPSITEC

Non Traditional Housing & PRC Properties

In the early 1980's many defects in designand construction were discovered in anumber of non traditional house types that

were designed and built before the 1960's.

These designs were designated as 'defective'under the housing defects legislation andalthough they only form a relatively smallproportion of the UK's non traditional housingstock, Local Authorities and private landlordsare required to bring these property types in linewith current regulations in an aim to sustainlocal communities, improve tenant quality ofliving and reduce the need for potentialdemolition.

WBS systems have successfully been used onmany of these housing types including:

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Airey

BISF

Cornish

Dorran

Dyke

Hawksley BL8

Hawthorne-Leslie

Kenkast Bungalows

Laing Easiform

Orlit

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Reema

Stent

Swedish Timber Frame

Tarran Bungalows

Tarran Newland

Unity

Wates

Wimpey No Fines

Woolaway

Laing Easiform (After)

Laing Easiform (Before)

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Unity (After)Unity (Before)

Airey (After)Airey (Before)

Kenkast Bungalows (After)Kenkast Bungalows (Before)

Unity (After)Unity (Before)

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Many traditional house types were alsoconstructed with little regard given totheir insulation values.

Single skin blockwork or properties constructedwith a cavity too narrow to be insulated, now fail tomeet current building regulations.

External Wall Insulation is the ideal solution forthese property types, resulting in thermalupgrading, a reduction in CO emissions and anaesthetical new lease of life.

Traditional Housing

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High Rise & Multi Storey Refurbishment

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Due to the nature of their construction, withextra stress being placed on the buildingsdue to wind loads etc, great care has to be

taken when designing a system suitable for highrise properties.

In the past, the external maintenance of high riseproperties has proven to be a particularly difficult,expensive and time consuming process, whichhas posed many problems for local authorities,housing associations and private landlords. Thisin turn has led to many of these propertiesdevolving into such a state of disrepair thatdemolition appears to be the only viable solution.

Traditionally constructed from pre-cast concrete,post-war high rise accommodation has thereputation of being cold, damp and difficult toheat, resulting in a reduced quality of living fortenants.

In much the same way as low rise refurbishment,high rise and multi storey properties can alsobenefit from the application of an External WallInsulation System. WBS systems are ideal forthese types of applications and great care andconsideration is taken when assessing the manyadditional technical factors of taller structures,including greater structural movement andincreases in wind loads.

On an individual project basis, WBS carry out adetailed survey to ensure that the structure issuitably sound and that the system specifiedensures that all weight and wind loadingrequirements are met. Pull out tests are carriedout to gauge the effect of increased wind suctionand u-value / dew point calculations are made toensure that the correct type and thickness ofinsulation is specified.

Detailed drawings covering all aspects of thesystem are prepared and every detail of theapplication, including fire resistance and

interfacing the system with new / existingwindows, doors and the roof, are considered.

Colour schemes and texture samples can also beprepared for client and tenant consultations.

In close collaboration with the approved installer,WBS monitor the application very carefully fromstart to finish.

Full guarantee and insurance bonds are alsoavailable to give clients and specifiers addedreassurance that the system is fully coveredagainst any eventuality.

The benefits of adopting these systems arenumerous, yet include an increase in thebuildings thermal performance, a reduction ofCO² emissions, a reduction in condensation anddamp and moreover the revitalisation theexternal fabric of the building. For the tenant thismeans lower heating costs and an increasedquality of living.

For further information, please callon .

WBSTECHNICAL SUPPORT 08458 382380

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Epsitec

Developed by WBS, the Epsitec systemhas been designed to satisfy the need foran insulated render system, incorporating

a drainage cavity.

Initially developed for the new build market, theEpsitec system provides an ideal solution forPRC and system built properties, where fixinginto the existing structure can prove problematic.

By fixing the Epsitec rails to the existing soundstructure or columns, it is possible to eliminate therequirement to drill and mechanically fix directlyinto the concrete panels, the method of which canoften prove difficult to achieve adequate fixingstrength or cause damage to the substructure.

Once the rails have been fixed in place, insulationboards span the gap and are fixed securely ontothe columns or alternatively directly into the railitself. The systems allows for a wide range ofinsulants of varying thicknesses to be used tohelp meet or exceed current building regulationsand U-value.

Following full insulation of the elevation, thesystem is finally completed via the use of a wideselection of WBS renders and finishes, whichgives the completed project an attractive, hard-wearing & weatherproof finish.

All in all, the Epsitec system provides an ideallightweight economical solution for low, mediumand high rise construction that eliminates theneed for expensive structural repairs and/orremoval of sheeting or panels which realisticallyassist with the overall insulating properties of thestructure.

EPSITEC ISOMETRIC SYSTEM BUILD UP

The steel & timber frame system incorporating a drainage cavity

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EWI Technical System Build Up

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The base of the system is reinforced by theuse of a full depth bellcast bead in polyestercoated galvanised steel or stainless steeland finished with a plastic nosing availablein a limited range of colours. Line of baselevel is usually set at DPC level.

1.2m polyester coated aluminium vergeaccessory with jointing collars at 2.5mcentres. Range of sizes exist to suit varyinginsulation slab thickness.

Undercill or overcill extenders can besupplied in 1.2 - 3.0mm thick polyestercoated aluminium with matching push fit orwelded end caps.

Cill extenders may also be site measured byWBS technical personnel and factoryfabricated with one piece welded end caps.Cill details are also available in moulded GRPor extruded GRC sections.

At party wall positions, the EWI system maybe terminated using a full depth stop bead oran external angle bead. The render finish isreturned for the full depth of the system.N.B. Where the adjoining property is alsobeing treated, allow for fitting WBS expansionjoint/movement joint bead.

1200mm x 600mm x required thickness ofinsulation slabs are fixed using approvedfixings.N.B. Fixing types are selected subject to sitepull out testing.

Insulation slabs overlap alternately at cornersand are mechanically fixed 150mm in fromarris and every 300mm vertically.

Rainwater pipes are removed during the works and short lengths of temporary pipe are fixed and taken over the scaffold awayfrom the wall. Replacement downpipes are fitted on completion via sleeved fixings through the EWI system.

An extra thickness of insulation board may be fixed around openings to create features.

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Where possible, a reduced thickness ofinsulation slab may be returned at openingreveals and heads dependent on window ordoor frame thickness. External angles arereinforced with polyester coated galvanisedsteel or stainless steel angle beads. Whereframes are too small, mesh and render alonemay be used. A contrasting colour may beused at reveals.

Extra mechanical fixings are used around allwall openings at 300mm centres max.

Alkali resistant reinforcing mesh bedded intoadhesive render coat and allowed to dry for aminimum of 12 hours, but not exceeding 24hours, before render finishing coat is applied.

Additional shaped pieces of mesh arebedded around all wall openings.

All external building corners are reinforcedwith polyester coated galvanised steel orstainless steel angle beads to give maximumimpact resistance.

WBS dashing mortar is through coloured andcan be trowel applied and dashed with a widerange of mineral aggregates, or alternativelyfinished with a alternative finish (such assilicone, acrylic, brick rend or brick slip).

The chimney may be treated to match thefinish on the main walls.

Plinth below DPC level of the existing wallmay be painted with WBS masonry paint.

Place first insulation board onto base railand secure with approved WBSmechanical fixings. Continue withadditional boards ensuring that astaggered laying pattern is adhered to.

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Application Guide

Applied to existing blockwork, incorporating EPS insulation & a spar dash finish

Attach base rails & surface profiles.

Install all beads and trims using approved WBSfixings at a maximum of 300mm centres(depending on the substrate - please consultWBS technical department for assistance).

Pull out tests must firstly be carried out todetermine appropriate fixings.

If required, substrate must be brushed down toremove any friable material, algae or lichen andfungicidal wash applied.

For wet fix and render only applications,stabilising solution may also be applied if requiredto help improve adhesion and offer uniformsuction.

Mix basecoat to a pliable consistency and trowel apply initial coat to insulation boards ata thickness of 4-5mm.

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Application Guide

Bed in alkali resistant reinforcingmesh into top third of basecoat,ensuring that an overlap of 75mm isachieved. Apply additional stresspatches and corner reinforcementsacross all window and dooropenings at 45° angles.

Apply corner beads, stop beads andmovement joints where required,using appropriate fixings.

Tidy up base rails and profiles with a damp paintbrush or similar to ensure a professional finish.

Apply WBS dashing mortar, available in a variety of colours, to a depth to suit the depth of the finishingaggregate (generally 8-10mm).

Note: Please note that these images are provided for illustrative purposes only. Health & Safety Regulations must always beadhered to and PPE should be worn in accordance with product data requirements and site conditions.

Whilst still wet, throw a complimentary coloured aggregate into the mortar, in an upward motion,ensuring an even distribution of chippings.

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Typical Standard Details

2. Expansion Joint Detail

3. Undercill Detail

Complete sets of the WBS standard details drawings can be found on our website.Project specific detailed drawings can be produced on request.

1. Detail at Base of System

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Typical Standard Details

4. Detail at Window Head 5. Detail at Building Corner

6. Fixing Arrangement

Please Note: These drawings are shown for example purposes only. WBS accept no liability arising from a third party acting onany information contained within these drawings and would advise that assistance is sought from persons within our technical

department on an individual project basis.

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System Finishes

For further information on the full range of WBS External Renders & Specialist Finishes please refer to ourbrochure.External Renders & Specialist Finishes

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Beads, trims & flashings

Mechanical fixings

Fungicidal treatments

Stabilising solutions

Bonding agents

Sealers & water-proofers

Anti-grafitti treatments

GRP canopies & architectural features

Hand & power tools

Safety equipment

Ancillary Products & Components

In addition, WBS supply a comprehensive range ofancillary products. Full technical details areavailable on request.

WBS Roughcast(Wet Dash)

WBS Ashlar EffectRender

WBS Silicone/Acrylic 'K’ WBS Silicone/Acrylic 'R’

WBS SiliconeScratch Render

WBS Smooth Render WBS Spar Dash Finish WBS Brick Effect Render

WBS Alpine Render WBS Brick Slip System WBS Tyrolean

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Project Type:Location:Client:Consulting Engineers:System Installer:System Used:

Finish:

Residential RefurbishmentAshton Park, Woolton Views & The Fairways Halewood, MerseysideKnowsley Housing TrustArcus Consulting LLP, LiverpoolSERS (Northern) LtdFull adhesive and mechanically fixed EWI systemusing 40mm Phenolic InsulationWBS Dry Dash Finish using a mixture of three contrastingdashing mortars and aggregates.

Details:

Three x 9 storey blocks.

U-value reduced from 1.12 W/m²K to 0.32 W/m²K.

Tenants kept involved with the scheme before, during and after the works.

A 'completion' celebration was held on 8 October 2004.

Project took 45 weeks. Completed on time to the immense satisfaction of the client, tenants andall other parties involved.

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Case Studies

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Case Studies

Project Type:Location:Client:System InstallerSystem Used:Finish:

Residential Refurbishment - Woolaway PRC PropertiesGarden Street, Llanbradach, CaerphillyCaerphilly County Borough CouncilJoyner PA (Cymru) LtdWBS EWI System using 50mm Phenolic InsulationWBS Brick Effect Render & WBS Dry Dash Finish

Project part of a totalrefurbishment scheme toinclude new windows, doors,roofs and external wallinsulation.

U-value reduced from 2.13W/m²K to 0.35 W/m²K.

Details:

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Case Studies

Project Type:Location:Client:Consulting Engineers:System Installer:System Used:Finish:

Residential Refurbishment - Wates PRC PropertiesNursery Crescent, Rhymney, GwentCaerphilly County Borough CouncilMichael Dyson AssociatesJoyner PA (Cymru) LtdWBS EWI System incorporating 50mm PIR InsulationWBS Brick Slip System, WBS Dry Dash Finish &'Woodstock' GRP canopies

65 houses in this phase.

E x t e r n a l r e s i d e n t i a lrefurbishment scheme on aproblem estate that was leftalmost derelict prior to theworks commencing.

U-value reduced to 0.21W/m²K.

Outcome of scheme sosuccessful a waiting list isnow in place for tenants.

Details:

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Case Studies

Project Type:

Location:Client:System Installer:System Used:Finish:

Residential Refurbishment & Energy ConservationProgrammeCarter Street & St. John's Drive, HydeNew Charter Housing Trust GroupHamilton (Building Contractors) LtdWBS EWI System incorporating 50mm Phenolic InsulationWBS Brick Effect Render

Certification and Accreditation

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The WBS EPSICON External Wall Insulation System is coveredby B.B.A. Certificate No 03/4058, onto a variety of insulations for aminimum life expectancy of 30 years.

WBS Silicone & Acrylic systems have received certification forEuropean Technical Approval from the DIBT, Germany which is anEEC wide accepted equivalent to B.B.A. standard.

Certificate Nos:14-8.04.04-10/0214-8.04.04-12/02

14-8.04.04-105/04

NBS Specifications can be obtained on request in NBS format.

The WBS THERMALOC External Wall Insulation System iscertified from manufacture and carries B.B.A. Certification coveringstandard dash receivers, flat renders and brick effect renders for aminimum life expectancy of 30 years.

WBS renders and cementitious products are manufactured andcertified to ISO9002, Certificates No 2478 and ISO9001/ISO-14001, Certificate No 12 100/1004 16976/2.

WBS are recognised as BBA approved system designers & are fullmembers of the Insulated Render and Cladding Association.

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Comprehensive specifications

(including NBS format)

Thermal calculations

Full colour technical drawings in CAD orPDF format

On site inspections and professional advice

Tenant awareness presentations

and regular liaison meetings

Physical product samples

Accurate budget costs supplied via

our network of approved contractors

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WBS Design & Specifications Advisory Service

In addition to our continuing success in supplyinghigh quality materials at cost effective rates, WBSoffer a complete

, enabling you to gain soundtechnical advice based on years of practical on-site experience and provided by qualified buildingprofessionals.

Located across the UK, our technical personnelcan advise on all aspects of the suitability ofmaterials and systems, provide details, designsand specifications for the application of theproducts and also supply U-value calculations,condensation risk calculations and physicaldisplay samples for client consultation purposes.

Design & SpecificationsAdvisory Service

Warranties

Approved Contractors

All WBS systems are guaranteed to perform topre-determined standards and are supplied witha standard 10 year materials and labour warranty.

For clients who require additional or extendedprotection, longer periods of latent defectsinsurance can be arranged, with time periods,terms and conditions determined at the designstage.

WBS are product distributors and do not directlycarry out any installation works. However, toenable us to enforce and maintain the higheststandards in the use of our products and systems,we have developed a substantial UK wide networkof contractors, who have been trained, assessedand approved in the application of our products andsystems.

To obtain a list of contractors in your area, pleasecall on

.WBS TECHNICAL SUPPORT

08458 382380

FOR TECHNICAL SUPPORTPLEASE CALL: 08458 382380

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Wetherby Building Systems Ltd1 Kidglove RoadGolborne Enterprise ParkGolborneWA3 3GS

Tel: 01942 717100Fax:01942 717101

Wetherby Building Systems LtdBlock 14, Unit A11 Coltness LaneQueenslie Industrial EstateGlasgowG33 4DR

Tel: 0141 766 1767Fax:0141 766 1768

E-mail: info@wbs-ltd.co.ukWeb: www.wbs-ltd.co.uk

External WallInsulationSystems

Refurbishment

External WallInsulationSystems

New Build

FlexibleSilicone &AcrylicFinishes

ExternalRenders &SpecialistFinishes

Brick SlipCladdingSystems

GRP Canopies &ArchitecturalMouldings