Innovation in exterior cladding and its planned maintenance
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Innovation in exterior cladding and its planned maintenance. 22 November 2007 Ed Suttie, BRE Geoff Taylor, Sikkens. Introduction. Exterior timber cladding Durability Innovations to improve durability System durability Planned maintenance Conclude. UK Cladding market : materials.

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Innovation in exterior cladding and its planned maintenance l.jpg

Innovation in exterior cladding and its planned maintenance

22 November 2007

Ed Suttie, BRE

Geoff Taylor, Sikkens

Introduction l.jpg

  • Exterior timber cladding

  • Durability

  • Innovations to improve durability

  • System durability

  • Planned maintenance

  • Conclude

Uk cladding market materials l.jpg
UK Cladding market : materials

  • No direct information on volumes of material used in UK market

Sustainability and life cycle l.jpg
Sustainability and Life Cycle











Second life...

In service



End of life

Energy recovery

Slide5 l.jpg

Raw materials

Design and specification

Manufacture and quality control

Build/install phase

Use phase

  • The performance of timber cladding and thus whether service life is met is influenced at all stages

  • Need to objectively assess the importance of each component of a system and its contribution to delivery of service life

Durability l.jpg

  • Capability of a building or its parts to perform its required function over a specified period of time under the influence of the agents anticipated in service

  • Material of biological origin - need for protection

  • Biological durability

  • Prevent moisture ingress

Delivering durability l.jpg
Delivering durability

  • Timber species

  • Substrate selection

  • Cladding design

  • Pre-treatment

  • End grain protection

  • Primer or base stain

  • Top coat

  • Finishing of the product

  • Storage, transport

  • Installation

  • Planned Maintenance

Cladding design then l.jpg
Cladding design then…..

  • Poor substrate selection

  • Poor design

  • Non specific fixings

  • Poor finishing on site

  • Adequately or poorly maintained

    Met service life??

Cladding design now l.jpg
Cladding design now….

  • Substrate selection

  • Best practice design

  • Fully factory finished

  • Just in time delivery

  • Fitted by qualified installers

  • Planned maintenance and care package

    Extended service life

Iso15686 service life prediction l.jpg
ISO15686 Service Life Prediction

Factor method ISO 15686

ESL = RSL x A x B x C x D x E x F x G

A quality of components (durability)

B design level

C work execution level

D indoor environment

E outdoor environment

F usage conditions

G maintenance level

Natural durability sufficient l.jpg
Natural durability sufficient?

EN335 Use Class

EN350 Natural durability


BS8417 Preservation

(EN599 and EN351)

Durability enhancement l.jpg
Durability enhancement

  • Upgrade to DC1

    • Costly, market acceptance?

  • Accept that for the chosen design and for timber species of low durability, to maintain the desired appearance, to deliver an acceptable service life then the durability will require enhancing

    Enhancing durability

    Permanence of characteristic

    Planned maintenance

Enhance durability and test l.jpg
Enhance durability and test

  • Wood preservation

  • Wood modification

  • Wood coatings

  • Combinations of the above

Challenges l.jpg

Wood preservation

  • Restrictions on traditional products (CCA alternatives)

  • Registration under Biocidal Products Directive

  • Penetration and retention

    Exterior wood coatings

  • Low maintenance

  • Full factory finishing

  • Low VOC coatings and processes

    Wood modification

  • Lack of fit with standards

  • Track record?

Innovation wood preservation l.jpg
INNOVATION: Wood preservation

  • Water-borne

  • Multi functional

    • Water repellent

    • Colour

  • Improved specification

  • Improved quality of treated products

Innovation wood modification l.jpg
INNOVATION: Wood modification

  • The action on wood by chemical, biological or physical means creating a new material - “modified wood” - with a desired property enhancement for the service life of the wood product

  • >50 years of wood science

  • Numerous technologies

  • Stimulated by the need to consider alternatives to

    • Conventional wood protection

    • Non-sustainable hardwoods

  • Exciting commercial reality

Wood modification l.jpg
Wood Modification

  • Modified wood technologies can…

    • Resist decay organisms (biological durability)

    • Minimise shrinking and swelling of the wood in changing moisture conditions (dimensional stability)

    • Confer hardness and wear resistance

    • Prolong the life of exterior wood coatings

    • Compete effectively with less sustainable materials

    • Improve end of life options

  • Thermal modification ThermoWood®

  • Acetylation AccoyaTM

  • Densification Indurite*

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Uncoated cladding

  • Typically uncoated cladding with non-uniform colour changes can lead to dissatisfaction

  • Brush applied maintenance coatings

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INNOVATION: Coating system

  • Water-borne

  • Low VOC

  • Extensibility

  • Photostability

  • Improved Environmental Profiles

  • Full factory finish

  • Powder coating

Coating of a rough sawn l.jpg
Coating of a rough sawn

Coating of a smooth surface

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Microscopic view of a rough sawn surface

Microscopic view of a smooth surface

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INNOVATION: Environmental Profiles

  • The Code for Sustainable Homes

  • The Green Guide to Specification

  • Presenting the case for timber

  • Improving product profiles

Code for sustainable homes 2007 l.jpg
Code for Sustainable Homes 2007

  • Single national standard for England

  • EcoHomes in Wales, Scotland, Northern Ireland and for refurbishment

  • Industry guide for design and construction for more sustainable new homes

  • A step change in sustainable building practice for new homes

Innovation fire protection l.jpg
INNOVATION: Fire protection

  • Multi functional

  • Fire Safety Design

  • Fire retardant pre-treatments BS 8414 Part 1 or 2

  • Wood Protection Association’s (WPA) Fire Retardant Manual

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INNOVATION: Construction

  • Off site construction

  • Full factory finished

  • Planned maintenance

  • Site practice and skills

Offsite construction l.jpg
Offsite construction

  • Modern methods of construction

  • Pre-manufacture

  • Less storage area on site

  • Quality of workmanship

  • Improved safety levels

  • Fast assembly

  • Reduced costs

    • Lower labour costs

    • Less waste

    • Less plant hire

    • Dimensional accuracy

    • Less disruption

  • Enhanced durability

Innovation planned maintenance l.jpg
INNOVATION: Planned Maintenance

  • £1 billion pa maintenance of buildings

    • Redecoration and maintenance painting of exterior wood is significant

  • Demands ‘value for money’

    • Reduce unnecessary maintenance activities

    • Reduce costs of incorrect surveys

    • Improve process selection

    • Higher standards of performance and quality

    • Improve site practices

    • Minimise waste

  • Move away from short-term first costs

Origin of maintenance specifications l.jpg
Origin of maintenance specifications

housing stock owners painting contractors

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Partnership and responsibility

  • Coatings manufacturer and contractor led with housing stock owners

  • Improved product performance

  • Raising skill levels

  • Improved maintenance practices

  • Maximise service life

  • Extend maintenance intervals

The integrated system l.jpg

The performance of timber cladding and thus whether service life is met is influenced at all stages

First costs sensitive, quality, consistent

Best practice, control, confidence in supply chain


Skills, partnership, value

Whole life costs sensitive, partnership, planned maintenance

Raw materials

Design and specification

Manufacture & Quality Control

Build/install phase

Use phase

The integrated system?

Conclusions l.jpg
Conclusions life is met is influenced at all stages

  • Design, durability and planned maintenance can deliver

  • Raising standards

  • Robust technologies fostered

  • New partnerships to ensure service life

  • Cladding product accreditation scheme

  • Holistic approach – durable integrated system

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Conclusions life is met is influenced at all stages

  • Great opportunity for exterior timber cladding

    • fully factory finished

    • new substrates

    • offsite construction

  • Move from a material orientated approach to an integrated product approach

  • Use the wood science!

  • Timber cladding delivered in partnership between the technology holder, the manufacturer, the specifier, the coating system company, the maintenance contractor and the building user/owner