weber renders and decorative finishes

Cover

To the best of our knowledge and belief, this information istrue and accurate, but as conditions of use and any labourinvolved are beyond our control, the end user must satisfythemselves by prior testing that the product is suitable fortheir specific application, and no responsibility can beaccepted, or any warranty given by our Representatives,Agents or Distributors. Products are sold subject to ourStandard Conditions of Sale and the end user should ensurethat they have consulted our latest literature.

EDITION FOUR© Copyright Saint-Gobain Weber Ltd

Back Cover

Saint-GobainWeber LimitedDickens House,Enterprise Way, Flitwick,Bedford, MK45 5BY, UK.Tel: 08703 330070Fax: 01525 [email protected]

Customer Services GBTel: 08703 [email protected]

TechnicalTel: 01525 722137Fax: 01525 [email protected]

Customer Service IrelandTel: 028 9335 2999

RendersandDecorativeFinishes

1

ContentsWeber is a leading player in the construction industry and is arecognised manufacturer and innovator of easy to applyproducts in the facades, tile fixing and construction mortarsmarkets.

Weber does not sell only products but the complete solutionswhich includes the services that go with the products;technical support and training. Based on its strong knowledgeand experience of the market, the Weber training programmesmeet the needs of its customers. Weber provides specifiers,developers and contractors across the board with substantialtechnical support, both before, during and after contractperiods.

Manufacturing Flitwick – BedfordshireTelford – ShropshireBallyclare – Northern Ireland

Technical offices Glasgow – Scotland

Weber is part of an international group employing 4,300people in 57 factories across 25 countries worldwide.

Weber is incorporated as Saint-Gobain Weber Ltd and is asubsidiary of Saint-Gobain. Established in France in 1665,Saint-Gobain is one of the world’s largest industrial groups,with an annual turnover of £35 billion and 206,000 employees.

The Group has been operating in the UK and Ireland since 1985.Saint-Gobain operates across five sectors; BuildingDistribution, Construction Products, Flat Glass, Packaging, HighPerformance Materials. Weber currently employs over 180people throughout Great Britain and Ireland.

www.netweber.co.ukWeber’s website offers extensive up to date and immediateinformation on the whole Weber product portfolio.

The new site is broken down into the 5 main Weber activities,External Wall Insulation, Renders and Decorative Finishes, TileFixing Products, Construction Mortars and Flooring. Eachactivity has its own dedicated home page allowing easynavigation to data sheets, case studies, material safety datasheets and problem solutions. Information is easilydownloaded via PDF links.

Literature, training, CPD presentations and even samplerequests can be ordered online - simply complete theregistration information and these items will be sent onto you.

We appreciate your feedback on our website - please email usat [email protected] with your comments.

WorldWideWeber

Inside Front Cover

The Guide to Renders Below

Product Range -3

Product/System Selector Page 4-5

Product Finish Selector Page 6-7

Monocouche Renders Page 8-13

Render Systems Page 14-15

Decorative Finishes Page 16-24

Ancillary Products Page 25-29

Good Site Practice Page 30-31

Movement Control Page 32-33

Machine Rendering Page 34-35

Training Page 36

Health and Safety Page 37

Projects Page 38-41

This render and decorative finishes guide serves as a quickreference to the Weber product range and the key issues forconsideration when selecting a render finish. Also availablefrom Weber is a comprehensive guide called Weber RenderSolutions.

Weber Render Solutions is specifically designed to meet theneeds of the specifier and professional tradesman. Thepublication provides good practice advice and solutions forfacade renders in many situations.

Weber Render Solutions is one of a series of three specifierhandbooks which cover the primary Weber business activities.

The handbook is designed to direct specifiers around theWeber render portfolio, narrowing selections and guidingthem to the most suitable solution that will fit the need of thecorrect project.

For your copy, order on-line from www.netweber.co.uk. Click onliterature request, then Weber literature tab, log in and put thenumber of handbooks you require or contact Weber CustomerServices staff on 08703 330070 for information on products.

The Guide to Renders

1

ContentsWeber is a leading player in the construction industry and is arecognised manufacturer and innovator of easy to applyproducts in the facades, tile fixing and construction mortarsmarkets.

Weber does not sell only products but the complete solutionswhich includes the services that go with the products;technical support and training. Based on its strong knowledgeand experience of the market, the Weber training programmesmeet the needs of its customers. Weber provides specifiers,developers and contractors across the board with substantialtechnical support, both before, during and after contractperiods.

Manufacturing Flitwick – BedfordshireTelford – ShropshireBallyclare – Northern Ireland

Technical offices Glasgow – Scotland

Weber is part of an international group employing 4,300people in 57 factories across 25 countries worldwide.

Weber is incorporated as Saint-Gobain Weber Ltd and is asubsidiary of Saint-Gobain. Established in France in 1665,Saint-Gobain is one of the world’s largest industrial groups,with an annual turnover of £35 billion and 206,000 employees.

The Group has been operating in the UK and Ireland since 1985.Saint-Gobain operates across five sectors; BuildingDistribution, Construction Products, Flat Glass, Packaging, HighPerformance Materials. Weber currently employs over 180people throughout Great Britain and Ireland.

www.netweber.co.ukWeber’s website offers extensive up to date and immediateinformation on the whole Weber product portfolio.

The new site is broken down into the 5 main Weber activities,External Wall Insulation, Renders and Decorative Finishes, TileFixing Products, Construction Mortars and Flooring. Eachactivity has its own dedicated home page allowing easynavigation to data sheets, case studies, material safety datasheets and problem solutions. Information is easilydownloaded via PDF links.

Literature, training, CPD presentations and even samplerequests can be ordered online - simply complete theregistration information and these items will be sent onto you.

We appreciate your feedback on our website - please email usat [email protected] with your comments.

WorldWideWeber

Inside Front Cover

The Guide to Renders Below

Product Range Page 2-3

Product/System Selector Page 4-5

Product Finish Selector Page 6-7

Monocouche Renders Page 8-13

Render Systems Page 14-15

Decorative Finishes Page 16-24

Ancillary Products Page 25-29

Good Site Practice 0-31

Movement Control Page 32-33

Machine Rendering Page 34-35

Training Page 36

Health and Safety Page 37

Projects Page 38-41

This render and decorative finishes guide serves as a quickreference to the Weber product range and the key issues forconsideration when selecting a render finish. Also availablefrom Weber is a comprehensive guide called Weber RenderSolutions.

Weber Render Solutions is specifically designed to meet theneeds of the specifier and professional tradesman. Thepublication provides good practice advice and solutions forfacade renders in many situations.

Weber Render Solutions is one of a series of three specifierhandbooks which cover the primary Weber business activities.

The handbook is designed to direct specifiers around theWeber render portfolio, narrowing selections and guidingthem to the most suitable solution that will fit the need of thecorrect project.

For your copy, order on-line from www.netweber.co.uk. Click onliterature request, then Weber literature tab, log in and put thenumber of handbooks you require or contact Weber CustomerServices staff on 08703 330070 for information on products.

The Guide to Renders

alpine finishCement-based mix with travertine finish

2 3

Decorative finishes - pages 16-24

Ancillary products - page 25-29

Preparatory key coat for rendering

• Polymer modified cement/sand mix

• Provides a good key for rendering

Monocouche renders - pages 8-13

weber.pral MOne-coat, premium through-coloured Monocouche rendersuitable for hand and machineapplication

A through coloured monocouche

render

• Through coloured

• Machine or hand applied

• Scraped or spray texture

Render systems - pages 14-15

Pre-blended single coat

application renders

• One coat render

• Factory batched

• Suitable for hand or machine use

Product Range

weber.pral DOne-coat, through-colouredhand applied Monocoucherender manufactured inIreland for the irish market

weber.rend OCRPre-blended single coatapplication renders

weber.rend MTA high performance, multi-coat render system,incorporating glass-fibremeshcloth, a resin-richadhesive coat with a choice oftextured finished in a widerange of colours

weber.tene.SG

White travertine finish

www.n

etwebe

r.co.uk

cullamix tyroleanCement-based mix with tyrolean finish

flexirend highbuildMulti-textured resin based finish

weber.tene SGPolymer-based decorative coating, fine

aggregate finish

weber.sil PA mineral-based, high performancesilicone paint

weber accelerateurmonocoucheA liquid setting accelerator solution forMonocouche

triple strength medusaAdmixture in white powder form. Its addition

to a concrete or mortar mix will improve thewater repellence of the finished work

weber PR310Pigmented Liquid Paint Primer

weber.rend aidPreparatory key coat for rendering

weber CL150Masonry Cleaner

54

How to use the selectorTo find the most suitable render option for your needs, refer tothe primary selector chart below and on the next page Guideto choice of finish for criteria that most closely fit yourrequirements.

Guide to choice of system

Blockwork Brick Concrete

Monocouchethrough colouredrender

Mineral CementBased Finishi.e. alpine,cullamix tyrolean

Synthetic Finishi.e. flexirendhighbuild

Withweber.rend

OCR

� �

�

�

Withweber.rend

OCR

Withweber.rendaid & OCR

Withweber.rend

aid

Withweber.rend

OCR

Withweber.rend

OCR

Withweber.rendaid & OCR

Cement/SandRenders

Substrate

Finish

RenderBoards

Withweber.rend

MT

Product/SystemSelector

76

Guide to choice of finish

Main product selectorSelectors here are designed to narrow your selection down to achoice of either monocouche, mineral or synthetic finishes.Colour and texture can be related to the actual product thatwill provide the finish chosen in the particular system.Substrate and main system features can be related to thesystem itself.

Mineral

Synthetic

Spraytexture

Scrape

finish

AshlarFinish

weber.pral M & weber.pral D24 colours

cullamixtyrolean6 colours

Monocouche

* For further information see handbook and website: (www.netweber.co.uk).

flexirendhighbuild10 colours

Product Finish Selector

Fine

texture

Travertin

e

Smoo

th

Rolle

rtex

ture

Natural

aggreg

ate

weber.plast TF*weber ncscolour range

weber.sil TF*weber ncscolour range

weber.sil Pweber ncscolour range

weber.plast DF*weber ncscolour range

weber.tene SG12 colours


weber.plast P*weber ncscolour range

alpine

76

Guide to choice of finish

Main product selectorSelectors here are designed to narrow your selection down to achoice of either monocouche, mineral or synthetic finishes.Colour and texture can be related to the actual product thatwill provide the finish chosen in the particular system.Substrate and main system features can be related to thesystem itself.

Mineral

Synthetic

Spraytexture

Scrape

finish

AshlarFinish

weber.pral M & weber.pral D24 colours

cullamixtyrolean6 colours

Monocouche

* For further information see handbook and website: (www.netweber.co.uk).


Product Finish SelectorFine

texture

Travertin

e

Smoo

th

Rolle

rtex

ture

Natural

aggreg

ate

weber.plast TF*weber ncscolour range

weber.sil TF*weber ncscolour range

weber.sil Pweber ncscolour range

weber.plast DF*weber ncscolour range

weber.tene SG12 colours


weber.plast P*weber ncscolour range

alpine

98

weber.pral monocouche renders create an external, decorative,through-coloured finish suitable for most types of brick orblockwork.

The factory production process for weber.pral renders ensuresquality materials are used in a controlled and accurate method,using proven engineered formulations which result in highperformance in practice.

Colour and Texture - A wide rangeof colours and textures are possiblecreating a wide range of options forthe designer. Colour charts areshown on the following pages.

Fast Track Construction - The use ofadvanced technology enables theweber.pral range to be applied inone application. In additionweber.pral M can be applied bymachine creating even fasterapplication.

Low Maintenanceweber.pral renders are throughcoloured in nature and therefore donot require further decoration.Should the need arise the rendercan be easily cleaned with a“hobby” style pressure washer andsuitable detergent.

Stonework design such as ashlarcan be replicated by cuttingrecessed joints into the finishedrender using specialist tools.

Changes in colour or thicknesscan be employed to produceraised features such bands, plinthsand stones.

Alternatively the render can be finished as a traditionalroughcast spray finish which is particularly effective in areas ofhigh exposure.

Monocouche Renders

11

� One-coat for fast application and shortprogramme periods

� Through-coloured for lowmaintenance – decorationnot required

� weber.pral D is available in24 colours

� A+ Green Guide rated

10

weber.pralD (only available in Ireland)

About this productweber.pral D is a one coat through coloured external rendermanufactured in Ireland for the Irish Market suitable formachine or hand application. weber.pral D is available in 24colours. NSAI approved certificate number 03/0180.

Cement basedSupplied in 25kg bagsCoverage: 25kg/m2 for 15mm finish thickness

Mweber

.pral

weber.pralM

About this productweber.pral M is a one coat through coloured external renderwhich offers a weather resistant, low maintenance and highlydurable finish.weber.pral M is suitable either for machine or handapplication onto brick or block walls. Available in a range of24 colours weber.pral M has achieved an A+ green guiderating. BBA approved certificate no 05/4268

Cement basedSupplied in 25kgCoverage: 25kg/m2 for 15 mm finish thickness

� One-coat for fast application and shortprogramme periods

� Through-coloured for low maintenance– decoration not required

� Formulated to be sprayapplied by render pump forfaster application

� weber.pral M offers a varietyof ways to achieve distinctarchitectural features

� Available in a range of24 colours

� A+ Green Guide rated

Dweber

.pral

Monocouche Renders

2500 Chalk

1312

weber.pral M and weber.pral Dcolours: non-standard range

These colour representations are as close as printing techniques permit. Final selection against an actualsample is strongly recommended.

weber.pral M and weber.pral Dcolours: standard range


Colour Chart

041 Cream

016 Ivory

674 Silver pearl

012 Earth

041 Cream

009 Beige 019 Sand 101 Parchment

086 Ocre Rose 232 Buff 632 Limestone

091 Pearl Grey 207 Light Beige 655 Mushroom

210 Granite Grey 276 Stone Grey 2502 Graphite

208 Light Blue 200 Azure Blue 038 Sage Green

057 Rose 080 Brick Red 055 Earth Red


application renders

• One coat render

• Factory batched


weber.rendOCR

About this productweber.rend OCR is a range of proprietary renders based onPortland cement, lime and sand. They are supplied as pre-blended dry powders, which require only the addition ofclean water to provide a comprehensive range of renderswhich comply with the mix designations and specificationsof BS 5262 and BS EN 13914.

Cement basedSupplied in 25kg bagsCoverage: 25kg/m2 for 16mm thickness

� Formulated to comply with British Standard mixdesignations (see technical data)

� Excellent weather resistance quality anddurability, whilst allowingthe structure to breathe

� Factory controlled productionto give a consistently highquality product

� Provide an appearance of atraditional cement and sandrender but in significantlyless time

� Non-combustible (Class 0 firerating when applied tonon-combustible substrates)

weber.rend MT

About this productweber.rend MT is a high-performance, multi-coat rendersystem, incorporating glass-fibre meshcloth, a resin-richadhesive coat with a choice of textured finishes in a widerange of colours.The image above shows a typical build up of the system.Further details can be found on www.netweber.co.uk or inthe render guide.

� Larges areas can be rendered on render substrateboards without the needs for expressed joints

� Allows previously uneven masonry substrates tobe rendered and gives a high level of crackresistance

� Established track record in varying climaticconditions

� Ideal for timber/metal frame applications

� Wide choice of colours and textures available

Can be used in conjuction with the weber.sil,weber.plast, flexirend highbuild and weber.tene SGfinishes

1514

Render substrate board

weber.rend LAC

Meshcloth

weber.rend LAC

weber PR310, weber PR320 orweber PR330 as appropriate

Synthetic finishweber.plast TF, weber.plast DF,weber.sil TF, weber.plast P,flexirend highbuild orweber.tene SG

Render SystemsOCR

weber

.rend

MT

weber

.rend


application renders

• One coat render

• Factory batched


weber.rendOCR

About this productweber.rend OCR is a range of proprietary renders based onPortland cement, lime and sand. They are supplied as pre-blended dry powders, which require only the addition ofclean water to provide a comprehensive range of renderswhich comply with the mix designations and specificationsof BS 5262 and BS EN 13914.

Cement basedSupplied in 25kg bagsCoverage: 25kg/m2 for 16mm thickness

� Formulated to comply with British Standard mixdesignations (see technical data)

� Excellent weather resistance quality anddurability, whilst allowingthe structure to breathe

� Factory controlled productionto give a consistently highquality product

� Provide an appearance of atraditional cement and sandrender but in significantlyless time

� Non-combustible (Class 0 firerating when applied tonon-combustible substrates)

weber.rend MT

About this productweber.rend MT is a high-performance, multi-coat rendersystem, incorporating glass-fibre meshcloth, a resin-richadhesive coat with a choice of textured finishes in a widerange of colours.The image above shows a typical build up of the system.Further details can be found on www.netweber.co.uk or inthe render guide.

� Larges areas can be rendered on render substrateboards without the needs for expressed joints

� Allows previously uneven masonry substrates tobe rendered and gives a high level of crackresistance


� Ideal for timber/metal frame applications

� Wide choice of colours and textures available

Can be used in conjuction with the weber.sil,weber.plast, flexirend highbuild and weber.tene SGfinishes

1514

Render substrate board

weber.rend LAC

Meshcloth

weber.rend LAC

weber PR310, weber PR320 orweber PR330 as appropriate

Synthetic finishweber.plast TF, weber.plast DF,weber.sil TF, weber.plast P,flexirend highbuild orweber.tene SG

Render Systems

OCR

weber

.rend

MT

weber

.rend

1716

� Excellent weather resistance and durability

� Low maintenance white finish

� May be over-painted when drywith a suitable masonrypaint if required

� Easy and quick to apply

� Simple to finish

� Contains an effective biocideto inhibit mould, algal andfungal growth

finish

alpine

alpine finish

About this productalpine finish is a white cement based mix containingaggregates that provides a decorative travertine finish.When used, alpine enhances the protection of a traditionalrendering system, and is suitable for coastal, town,suburban & rural environment.

Cement basedSupplied in 25kg bagsCoverage: 5-6m2 per 25kg bag

Complementing the Monocouche range Weber offer a choice ofmineral and synthetic decorative finishes which can rejuvenateexisting substrates and provide a high quality finish for newbuild applications. The low maintenance finishes not onlycreate an attractive appearance but also protect with a durableand weather resistant surface. These products can be used ona variety of substrates and range in nature from traditionalfinishes to advanced flexible coatings.

Colour and textureA wide colour choice is availableand a variety of surface finishesare possible ranging fromsmooth to textured.

High performanceSpecialist paints such asweber.sil P are silicone basedwhich provides a finish withhigh water sheddingcharacteristics whilst remainingvapour permeable.

Finishes such as flexirend highbuild have a degree of flexibility,making them able to accommodate relatively higher naturalmovement that is associated with framed, timber or sheathingboard substrates

Support SystemsFor dense masonry substrates weber.rend OCR is a suitablebacking render for Weber decorative finishes. For framedconstruction the weber.rend MT system can be used inconjunction with a render backing board such as Bluclad andfinished with a synthetic texture. Decorative finishes aresuitable for use with insulated systems which are covered inthe Weber render solutions brochure.

Decorative Finishes

1918

� Pre-blended – requires only the addition ofclean water on site

� Durable and weather resistant

� Through coloured – requiresminimal maintenance andno subsequent painting

� Suitable for most environments:coastal, suburban and rural

� Can be used as an attractive,sound-absorbing texturedfinish on internal render

tyrolean

cullamix

cullamix tyrolean

About this productcullamix tyrolean is a white orcoloured cement based mix,which provides a decorative andprotective rendering. It is applied byhand or power operated machines and provides an openhoneycomb textured (Tyrolean) finish.

Cement basedSupplied in 25kg bagsCoverage: 5m2 per 25kg bag fl

exirendhighbuild

flexirendhighbuild

About this productflexirend highbuild is a decorative and protective resinbased surface coating for application to exterior andinterior surfaces. It is a high quality, weather resistant finish,which may be textured to a variety of designs. It is availablein a range of colours and provides a superior qualityappearance to cement rendering, concrete and many otherbacking materials.

Cement basedSupplied in 15kg pailsCoverage: 6m2 per 15kg pail

� Factory controlled to give a consistently highquality product

� Highly durable

� Remains slightly flexible after curing and willaccommodate a degree of building movement

� High performance weather proof coating whilstallowing the substrate to breathe

� Excellent weather resistance

� Available in a range of10 colours

Decorative Finishes

2120

674 Silver

632 Limestone

633 Butter

643 Oyster (Not available in cullamix)

652 Terracotta (Not available in cullamix)

These colour representations are as close as printing techniques permit. Final selection against anactual sample is strongly recommended.

flexirend highbuild & cullamix colours

675 White

635 Ivory (Light Magnolia in flexirend)

637 Bathstone (Not available in cullamix)

655 Mushroom (Not available in cullamix)

672 Grey

Colour Chart

2322

weber.teneSGcolours

H A101 H A211

H A207 H A402

H A105 H B464

H A354 H A451

H A157 H A302

H A209 H A306


weber.tene.SG

� Natural marble aggregates provide long lasting,hard wearing, durable finish

� factory batched for consistency

� Available in a range of 12 colours

� Practical benefits of ease ofapplication, speed,economy and long shelf-life

� Established track record invarying climatic conditions

� Made to order

weber.teneSG

weber.teneSG

About this productweber.tene SG is a polymer-based decorative coating with afine aggregate finish.

It is an external finish comprising natural aggregates boundin a clear resin binder.

Essentially non-hazardousSupplied in 25kg plastic containersCoverage: 5.5 - 6.5 kg/m2 for a nominal thickness of 3mm

Decorative Finishes

2524

webera

ccele

rateur

mono

couche

weber accelerateur monocouche

About this productweber accelerateur monocouche is an initial set acceleratorsolution for Monocouche through-coloured renders to speedup the time to scrape during colder application periods.

Essentially non-hazardousSupplied in 20 litre plastic containersyield: 0.1 litre of product per 25kg bag of monocouche

� As a liquid component it can directlyreplace a proportion of the productgauging water

� If added at the correct dose itwill achieve 20˚C scrape timeswhen working at 5˚C

� Colourless liquid has no effecton the appearance of thefinished product

� A high quality mineral paint for new buildmasonry substrates

� A low-maintenance finish on to externalwall insulation

� Rejuvenates existing rendered substrates

� Resistant to algae andfungi growth

� Highly hydophobic - waterbeading effect (see imageinsert) helps maintain aclean surface

� Resistant to blisteringand peeling

weber.sil P

About this productweber.sil P is a solvent-free, water-based silicone resinemulsion paint (SREP) for masonry substrates.

weber.sil P is available in a wide range of colours. Specifiersshould consult the NCS Colour Chart on the Weber websitewww.netweber.co.uk.

Essentially non-hazardousSupplied in 10 litre plastic bucketsCoverage: 2 coats 0.5 litre/m2

Decorative Finishes Ancillary ProductsP

weber

.sil

2524

webera

ccele

rateur

mono

couche

weber accelerateur monocouche

About this productweber accelerateur monocouche is an initial set acceleratorsolution for Monocouche through-coloured renders to speedup the time to scrape during colder application periods.

Essentially non-hazardousSupplied in 20 litre plastic containersyield: 0.1 litre of product per 25kg bag of monocouche

� As a liquid component it can directlyreplace a proportion of the productgauging water

� If added at the correct dose itwill achieve 20˚C scrape timeswhen working at 5˚C

� Colourless liquid has no effecton the appearance of thefinished product

� A high quality mineral paint for new buildmasonry substrates

� A low-maintenance finish on to externalwall insulation

� Rejuvenates existing rendered substrates

� Resistant to algae andfungi growth

� Highly hydophobic - waterbeading effect (see imageinsert) helps maintain aclean surface

� Resistant to blisteringand peeling

weber.sil P

About this productweber.sil P is a solvent-free, water-based silicone resinemulsion paint (SREP) for masonry substrates.

weber.sil P is available in a wide range of colours. Specifiersshould consult the NCS Colour Chart on the Weber websitewww.netweber.co.uk.

Essentially non-hazardousSupplied in 10 litre plastic bucketsCoverage: 2 coats 0.5 litre/m2

Decorative Finishes Ancillary Products

Pweber

.sil

2726

weber.rend aid

About this productweber.rend aid is a preparatory key coat for renderingconsisting of a polymer modified cement and sand mix. Thepowder blend includes an integral bonding agent so that itrequires only the addition of clean water on site.

Cement basedSupplied in 25kg bagsCoverage: 7.5m2 per 25kg bag

� Provides a good key for rendering onto smooth orotherwise unsuitable but sound substrates

� Equalises suction on mixed backgrounds� Provides excellent suction control

across both high and lowsuction substrates

� Resists the penetration ofexternal water to improve theweather resistance ofrendering systems

� Quality controlled and factoryblended to give consistentlyhigh quality product

� Easy to apply by hawkand trowel and/or roller

� Provides increased water repellence

� Assists in providing even suctionin undercoats

� Reduces water permeability

� Reduces the risk of surfacecrazing of in-situ andprecast concrete

� Reduces surface waterabsorption

triple

streng

thtriple strengthmedusa

About this producttriple strength medusa is an admixture in white powderform. Its addition to a concrete or mortar mix will improvethe water repellence of the finished work.

Essentially non-hazardousSupplied in 330g sachets (20 per carton) or 20kg sacksCoverage: one 330g sachet is sufficient for a mixcontaining 50 kg cement

medusa

aid

weber

.rend

Ancillary Products

2726

weber.rend aid

About this productweber.rend aid is a preparatory key coat for renderingconsisting of a polymer modified cement and sand mix. Thepowder blend includes an integral bonding agent so that itrequires only the addition of clean water on site.

Cement basedSupplied in 25kg bagsCoverage: 7.5m2 per 25kg bag

� Provides a good key for rendering onto smooth orotherwise unsuitable but sound substrates

� Equalises suction on mixed backgrounds� Provides excellent suction control

across both high and lowsuction substrates

� Resists the penetration ofexternal water to improve theweather resistance ofrendering systems

� Quality controlled and factoryblended to give consistentlyhigh quality product

� Easy to apply by hawkand trowel and/or roller

� Provides increased water repellence

� Assists in providing even suctionin undercoats

� Reduces water permeability

� Reduces the risk of surfacecrazing of in-situ andprecast concrete

� Reduces surface waterabsorption

triple

streng

th

triple strengthmedusa

About this producttriple strength medusa is an admixture in white powderform. Its addition to a concrete or mortar mix will improvethe water repellence of the finished work.

Essentially non-hazardousSupplied in 330g sachets (20 per carton) or 20kg sacksCoverage: one 330g sachet is sufficient for a mixcontaining 50 kg cement

medusa

aid

weber

.rend

Ancillary Products

2928

weber CL150

About this productweber CL150 is a water-based masonry wash containingcarefully selected biocides effective against a broad range ofbacterial, fungal,algal, yeast and mould species. It is used asa masonry cleaner and steriliser to kill green, black andother organic growths on walls and other masonry,particularly prior to the application of decorative finishes.

Water based (contains biocides)Supplied in 5 and 25 litre bottlesCoverage: 0.1 litre/m2

� Fast acting

� Simple application


� Untinted versions show noresidue after treatment

� Ready for use

� 25-litre tinted version for easyidentification of coated areas

� Low viscosity

� Factory batched for consistency

� Practical benefits of ease of application, speed,economy and long shelf-life

� Established track record in varyingclimatic conditions

� Will assist in ensuring thatthe subsequent finishes willhave a minimum life of10 years

weber PR310

About this productweber PR310 is an effective method of preparing substratesby reducing suction and providing a colour wash prior tothe application of many Weber finishes.

Essentially non-hazardousSupplied in 10 litre plastic bucketsCoverage: 0.25 litre/m2

CL1

50

weber

Ancillary ProductsPR310

weber

2928

weber CL150

About this productweber CL150 is a water-based masonry wash containingcarefully selected biocides effective against a broad range ofbacterial, fungal,algal, yeast and mould species. It is used asa masonry cleaner and steriliser to kill green, black andother organic growths on walls and other masonry,particularly prior to the application of decorative finishes.

Water based (contains biocides)Supplied in 5 and 25 litre bottlesCoverage: 0.1 litre/m2

� Fast acting

� Simple application


� Untinted versions show noresidue after treatment

� Ready for use

� 25-litre tinted version for easyidentification of coated areas

� Low viscosity

� Factory batched for consistency

� Practical benefits of ease of application, speed,economy and long shelf-life

� Established track record in varyingclimatic conditions

� Will assist in ensuring thatthe subsequent finishes willhave a minimum life of10 years

weber PR310

About this productweber PR310 is an effective method of preparing substratesby reducing suction and providing a colour wash prior tothe application of many Weber finishes.

Essentially non-hazardousSupplied in 10 litre plastic bucketsCoverage: 0.25 litre/m2

CL1

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weber

Ancillary Products

PR310

weber

3130

BlockworkGenerally a block is manufactured with an open texture or a designed key for rendering.Relying on the raking of mortar joints is not sufficient to provide the key alone.Smooth dense blocks with little mechanical key should have the key enhanced by anapplication of weber.rend aid stipple coat.The strength and density of the blockwork should be assessed in regard to itscompatibility with the proportion of cement content of the chosen rendering. Lowdensity blockwork such as Aerated Autoclaved in some cases may not be compatiblewith a render mix having a cement:lime:sand ratio stronger than a 1:1:6 for example.Block manufacturers can advise on the recommended mortar/render strengths for thechosen block. Strength or classification of renders is detailed in the individual productliterature in Section 10 of the Weber render solutions handbook.

ConcreteConcrete offers minimal suction and generally insufficient key for the rendering toadhere. The aggregate should be exposed during construction of the concrete, or afterthe concrete has cured by the use of bush hammering or other suitable mechanicalmeans. Alternatively, the concrete should be coated with a weber.rend aid to providekey for the subsequent render application. No-fines concrete will provide a satisfactorykey. Please note that advice should be sought regarding concrete curing agents thatmay interfere with the bond of the weber.rend aid application.

BrickworkTo provide key, new brickwork should be laid with the mortar joint recessed 10 – 12 mmby width and depth squarely.Existing brickwork will require the joints raking back to the above dimensions. If thejoint is too hard, the key should be provided by a stipple coat of weber.rend aid.Some common bricks may contain deleterious sulphate salts. If possible, advice shouldbe sought from the brick manufacturer regarding their use as a substrate for renderingin that location, particularly in high exposure or potentially damp areas.

The substrate should be constructed of durable and moderately strong materialsspecifically designed to receive modern renders.They should be clean, suitably dry, sound and free from anything that mayinterfere with the adhesion, such as oil, grease, organic matters and soluble salts.

StrengthThe substrate should bedesigned andconstructed so that itadequately supports andrestrains the rendering.The substrate, includingany joints in masonry,should be no weakerthan the renderingmaterial used.

SuctionGood adhesion of acement render is greatlyreliant on the suction inthe substrate. Excessivesuction will impair thehydration of the renderingand therefore affect itsbond with the substrate.On the other extreme, lowsuction substrates will notoffer sufficient capillaryaction to gain a goodbond.

KeyFor the background togive support it mustprovide an open orpreformed texturedsurface to allow therender material topenetrate and promoteaggregate interlockbetween the render andthe substrate.

An application of weber.rend aid will deter sulphates from crystallising and impairingthe bond of the render.

Suction controlSuction control, particularly when using lower density block, should be achieved byspraying the wall with an even mist of clean water prior to rendering. If there are acombination of issues, such as varying suction or insufficient key in addition to highsuction, then an application of weber.rend aid is recommended.Please note that mist spraying with water should be done in a controlled manner inorder to avoid saturating the blockwork. Excessive watering will increase dryingshrinkage and can induce cracking in the block. Any such cracking is likely to bereflected in applied materials.

Strong adhesive key to substratebuilt into weber.rend aid keycoat

Section through substrate with suitable key and suction

Zone of key formedthrough suction

Zone of mechanical key

Applied render

Section through substrate requiring mechanical key

weber.rend aid key coatapplied 2 – 3 mm and texturedto produce a deep, heavymechanical coat

Zone of mechanical key

Good Site Practice

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Weber renders are manufactured from carefully selected and graded aggregatesto minimise drying shrinkage of the applied render. Providing that goodpractice, appropriate design and suitable preparation is undertaken, therendering will be fully bonded to the substrate and restrained from movementby that surface and will not crack. It is therefore most important thatstress/crack control is considered prior to construction of the substrate in orderto reduce the likelihood of cracking.When the construction is correctly divided into appropriate panels separated bysuitable movement joints, the stresses caused by drying shrinkage and normalbuilding movement will dissipate to the detailed relief joints. Movement jointsare not a requirement in the render alone as this is fully bonded to thesubstrate. They should however, reflect and follow through from the relief jointsdetailed in the construction.

Movement jointsGuidance on the placement of movement joints should be gained from the specifiedblock manufacturer and used in conjunction with the BS EN 1996-2:2006 Code ofpractice for use of masonry and BS 6093:2006 Code of practice for design of jointsand jointing in building construction.The guidance given in these standards is that joints should usually be included at 6m intervals and 3 m from corners, however, this will vary depending upon the type ofconstruction and the strength of the brick or block.

Mortar bedding joint reinforcementThe exact spacing of joints can be adjusted by the use of mortar bedding jointreinforcement. The amount and positioning of this reinforcement should be detailedby the block manufacturer. In Weber’s experience cracking of the substrate can beconsiderably minimised if mortar bedding joint reinforcement is used, specifically:

The render’s ability to distribute and resiststresses can be enhanced by the inclusionof glass fibre reinforcement mesh cloth atpositions of localised high stress i.e. at thecorners of openings, at junctions ofdiffering materials or around crackinducers such as weep holes. For moredetail regarding the inclusion of meshplease refer to best practicerecommendations in Section 9 of theWeber render solutions handbook.Straight line cracking that can sometimesbe seen in completed render panels isnot typical of render failure, butrather the reflection of a crack in thesubstrate. Stress/crack control mustbe given serious consideration priorto construction.

At weak points inthe construction,such as above andbelow windowand door openings

Meshcloth embeddedin the first pass ofmonocouche render.

1

2

3

To increase thespacing ofmovement jointsbeyond thatrecommended forreinforced masonry

In long panelswhere movementjoints areimpractical

3m 6m

movement joints

Glass fibre mesh reinforcement

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Movement Control

Technology that makescurrent skilled personnelmore productive is a distinctadvantage. A machineapplication does just that.Tradesmen applyingexternal renders must to befree to apply their skills tocompleting wall areas, notlabouring to carry or hoistmixed material to the placeit is needed. Modernmachinery not only mixesand conveys the wetmaterial in just such a waybut also even applies it tothe wall so that tradespeople have the opportunityto use their levelling andfinishing skills to the full.

Sprayed roughcast finishes are made possible only with the machineapplication approach where panels are applied and finished within hours ofstarting - truly the fast track method of modern rendering. The UK and Irishmarket has been very traditional in approach and it has taken many yearsfor a technology that is widely accepted on the continent to be adopted here.The pioneers though have now established the principles and more andmore of Weber’s recommended applicators have made machine applicationthe very core of their businesses.

Several types of machine are on the market.

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Advantages• Self-contained diesel driven or Electric 400volt

• Designed for renders & plasters

• Can pump long distances 20 to 50 litres a minute

(up to 60m dependent on height and material)

• 300 to 350m2 of finished work a week

including preparation

• Batch mixers or Continuous mixer

• Accurate water control

• Uniform product consistency

• Material can be used

direct from the pallet

• Easy to clean

Machine Rendering

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The building industry is the most dangerous work environment bar none.Much effort has been put into improving the generally dismal historicalrecord. As a responsible manufacturer Weber is constantly reformulatingproducts to reduce possible risks to users and clearly states what risks areinvolved with all products. These risks only apply during application. Oncecured, the products are non-hazardous in all respects. All materials carryHealth and Safety labelling in a clear easily recognisable format asrecommended by the HSE (Health & Safety Executive).

LiftingEven when labelled as non-hazardous, a practical, common senseapproach to material usage is to be recommended. Weber materialsmanufactured in the UK are kept to weights of 25kg and below wherepossible. Lifting should be carried out with the back straight and uprightwith the load as close to the body as possible. Do not to cut corners byattempting to carry multiple packs above 25kg.

Essentially N0n-hazardousOur pastes, liquids and sealants are generally non-hazardous in use butmay be difficult to remove when dry. The generic Health & Safety labelreproduced here carries commonsense precautions.

Products:weber.pral Mweber.pral Dweber.rend aid

alpine finishcullamix tyrolean

Cement basedThe HSE has identified the small amount of soluble Chromium VI thatnaturally appears in grey ordinary Portland cement as the element thatstimulates an allergic dermatological reaction in some people that resultsin ‘cement burns’. Legislation now requires manufacturers to keep levelsof soluble chromium VI below 2 parts per million of the total dry weightof the cement content.White cement/sulphate-resisting cement and cement fondu all havecontents below this level and are naturally compliant.Ordinary Portland cement however needs to be treated to achieve theselevels. All material supplied by Weber is either naturally compliant or hasbeen treated to be compliant for the stated shelf life. Bags must be storedunopened, in clean dry conditions, off the ground and above 5°C. Use oftreated products after the end of the declared storage period mayincrease the risk of an allergic reaction.Cementitious mixes may contain relatively sharp, often angularaggregates and are therefore generally abrasive when wet. Newly appliedproduct is also very alkaline.

Products:weber.plast TFweber.plast DFweber.sil TFweber.tene SG

flexirend highbuildtriple strength medusaweber.plast Pweber.sil P

* For weber accelerateur monocouchesee label on packaging

Weber, an international leader in the manufacture and application ofinnovative and practical solutions for both Facades and Construction, ispleased to outline its comprehensive training programme forMonocouche Renders, External Wall Insulation, and Concrete Repair &Construction Mortars.The product Training Manager has developed course programmesspecifically to address the current needs of the industry. Scheduled coursesare run monthly and a series of further in- depth specialist courses canbe carried out by arrangement,Weber appreciates the importance oftraining and aims to bridge the skills divide by working closely withapplicators and colleges etc.

MonocoucheAimed primarily at those usingMonocouche materials for the first time,this course explores the fundamentalbasics of good rendering practice alongwith the application and finishingtechniques associated with theseproducts. A one day course, it includesboth theoretical and practical activity.Practical demonstration of machineapplication techniques are included aspart of the course.

Basic Introduction to External Wall InsulationIncreasingly popular as the technically superior method of achieving evermore stringent insulation requirements, External Wall Insulation (EWI) has awide range of possible insulants, systems and finishes. This one day courseprovides an overview of the complete range of render protected EWI systemsalong with a guidance regarding the basic principles involved.

Further weber.therm, system-specific courses are available by arrangement.

Training Health and Safety

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Projects

Product:weber.pral MLocation: Ireland

Product:weber.pral MLocation: Swansea

Product:weber.pral MLocation:Dartford

Product: weber.pral DLocation: Cloughey, Co Down, Ireland

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Inside Back Cover

Projects

System:weber.rend MTLocation: Dundee

Product:weber.pral MLocation: Baldoylr, Co Dublin

Product:weber.pral M - ashlarLocation:Deepcut, Surry

Product: weber.plast TFLocation: London

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Cover

To the best of our knowledge and belief, this information istrue and accurate, but as conditions of use and any labourinvolved are beyond our control, the end user must satisfythemselves by prior testing that the product is suitable fortheir specific application, and no responsibility can beaccepted, or any warranty given by our Representatives,Agents or Distributors. Products are sold subject to ourStandard Conditions of Sale and the end user should ensurethat they have consulted our latest literature.

EDITION FOUR© Copyright Saint-Gobain Weber Ltd

Back Cover

Saint-GobainWeber LimitedDickens House,Enterprise Way, Flitwick,Bedford, MK45 5BY, UK.Tel: 08703 330070Fax: 01525 [email protected]

Customer Services GBTel: 08703 [email protected]

TechnicalTel: 01525 722137Fax: 01525 [email protected]

Customer Service IrelandTel: 028 9335 2999

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