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					     Outside                                                                                            Gillian Allder,chairman of
                                                                                                        the Insulated Render and
                                                                                                        Cladding      Association,
     interest                                                                                           explains how insulated
                                                                                                        render and cladding
                                                                                                        meet the demands of
                                                                                                        tighter energy efficiency
                                                                                                        requirements
                                                                                                        THE government has recently
                                                                                                        announced that a major revision of
                                                                                                        Building Regulations is to be brought
                                                                                                        into effect in April 2005. The revision
                                                                                                        will encompass a shift towards far
                                                                                                        greater energy efficiency and will cre-
                                                                                                        ate an opportunity for sustainable con-
                                                                                                        struction and for builders to maximise
                                                                                                        the potential that energy efficiency
                                                                                                        technologies can play in the new build
                                                                                                        market.

                                                                                                        Tighter Building Regulations will encour-
                                                                                                        age the construction industry to use low car-
                                                                                                        bon solutions and to be more aggressive and
                                                                                                        forward thinking. Builders will need to focus
                                                                                                        on new and innovative building methods
                                                                                                        that will economically meet the new energy
                                                                                                        efficiency criteria that constantly changing
                                                                                                        Building Regulations demand.
                                                                                                           The insulated render and cladding indus-
                                                                                                        try is in a strong position to meet future
                                                                                                        energy efficiency demands of all types of

      Wall to wall solutions                                                                            buildings.Advances in technology and inno-
                                                                                                        vative design have opened up a completely
                                                                                                        new market for insulated render and
     IN a world full of restrictions, rules           not limited to cavity walls. For example, in      cladding and this is illustrated by the dra-
     and regulations it is natural to seek            a typical timber framed wall, the depth of        matic impact it has made on both the new
     the simplest and most direct way of              mineral fibre insulation needed between           build and re-modelling market. Specifiers
     complying, preferably without invest-            studs to achieve the required U-value of          and architects are now appreciating the tech-
     ing too much time and money, writes              0.35 W/m2.K in walls would be 110-                nology of external wall insulation and recog-
     Phil Heath, technical manager of                 120mm in England and Wales.This would             nising its various qualities in both the
     Kingspan Insulation Limited.                     lead to at least 110-120mm stud depths. In        domestic and industrial/commercial field. It
                                                      practice a standard 140mm nominal stud            can be successfully used for all size of build-
     Such is the world of construction, where         would probably be used. Mineral fibre             ing – from the smallest extension to a luxu-
     revisions to legislation have often led to       relies on friction to prevent slumping, so        rious apartment block or prestigious office
     changes in building practice.This has meant      150mm of mineral fibre quilt with the             building.
     rethinking traditional methods and materi-       140mm stud would be needed. Only                     In addition to meeting increasing energy
     als and looking at creative solutions.           65mm of a modern material such as rigid           efficiency standards, the building industry
        Take for example the area of insulation;      urethane insulation would be needed to            now has to respond to dramatic variations in
     the arrival of Approved Documents L1 and         achieve the same U-value in between               climate, such as wetter and warmer weather,
     L2 in England and Wales and Technical            89mm timber studs in a timber frame.              and the way in which buildings are con-
     Standard J in Scotland has brought about a          The same rules apply as for masonry cav-       structed to accommodate these changes.The
     revolution in the standards to which our         ity wall structures, and there are similar cost   external wall insulation industry is poised to
     homes and places of work are insulated,          implications to consider.                         meet this challenge, particularly in the new
     leading to energy savings and environmen-           Rigid urethane boards are easy to handle       build sector, both with masonry construc-
     tal benefits.The issue is not the legislation,   and install, needing no specialist equip-         tion and an increasing amount of framed
     but how best to comply with it.                  ment. They are unaffected by air move-            construction, such as timber and steel.
        The solution is partial fill cavity wall      ment, are resistant to water penetration             Applying insulated render and cladding
     insulation, using high performance rigid         and, when properly installed, maintain their      externally to solid walled or framed building
     urethane insulation materials.As little as 25-   superior performance over the lifetime of         structures is one of the fastest growing build-
     45mm is required depending on the ther-          the building. They do not suffer from the         ing techniques. Indeed, it could be said that
     mal performance of the blocks used. This         problems of voids and areas of low density        today’s innovative designs using external wall
     solution maintains the gap between the           that are common with injected full fill sys-      insulation are set to become tomorrow’s
     inner and outer leafs, improving the overall     tems. Most importantly, they easily achieve       standard options.
     thermal effectiveness of the structure and       the U-values required with minimal thick-            The process offers a way of achieving low
     avoiding problems with water penetration.        ness, within existing footprint and standard      U-values, while protecting the structure by
        The effects of the new Regulations are        construction details.                             keeping it warm and dry.Thus the structure
                                                                                                        does not have to withstand the rigours of

28                                                              Master Builder February 2004
                                                                                                                                   Insulation

drastic temperature changes, as can be expe-          skilled operatives and the depletion of train-      Insulated renders and claddings are com-
rienced with alternative methods of con-              ing programmes is epitomised by figures that      posite systems – established processes that
struction, enabling them to meet the current          show that 54 is the average age of a brick-       have been carefully researched and tested. In
Part L Building Regulations and beyond.               layer in the UK.This undoubtedly highlights       view of the skill needed to apply it, it is
The use of thicker layers of insulation on the        the need for the construction industry to         important to use a system registered with
outside becomes a cost-effective way of               look for alternative methods of construc-         the Association and, to maintain integrity, an
achieving tighter U-values: O.2W/m2K or               tion.                                             INCA specialist installer to apply it. It is also
even less can be achieved.Thus this building             While new build design using insulated         important to employ a system with third
technique can easily meet constantly chang-           renders and claddings may necessitate certain     party accreditation for the construction type
ing thermal insulation requirements.                  changes in basic thinking in relation to con-     on to which it is being installed.
   In the UK the increasing shortage of               struction and the building fabric, the appear-      Specifiers who appoint this team of
skilled labour for conventional construction          ance should not be radically different from       experts, with built-in Association back-up,
and architectural design is now directing the         conventionally constructed buildings.             can be confident they are being offered
construction industry to recognise the                Whatever the method of construction, the          quality products and workmanship by com-
intrinsic benefits of insulated render and            end result is basically the same – a ‘sandwich’   panies abiding by the Codes of Practice of
cladding as a fast new build method that,             effect comprising the structure, the insula-      the Insulated Render and Cladding
added to concrete block to form a solid wall,         tion and decorative finish.                       Association. The Association is then in a
or framed construction,can go up faster than             Systems, which are applied to the exterior     position to assist in looking after the interests
traditional building – yet still retain the tra-      walls of existing or new buildings, comprise      of the specifier.
ditional appearance.The government’s plans            an insulant and weather-protective finish, of       INCA also offers an insurance-backed
to substantially increase the number of new           which there are three main types:                 guarantee scheme covering design, materials
houses that are to be built in a relatively           • Traditional renders and finishes                and workmanship – only available through
short space of time will also create a demand         • Thin coat polymer modified cemen-               INCA installers using INCA BBA and BRE
for building with insulated render and                  tious and reinforced renders and syn-           Wimlas accredited systems. Systems can be
cladding.                                               thetic finishes                                 designed and installed to comply with all
    For example, timber frame is a fast build-        • Preformed cladding materials.                   current fire performance regulations and
ing method, which provides a lightweight              By its nature, the insulated render or            guidance.
structure. It lends itself to off-site partial fac-   cladding places insulation where it will pro-       For further information, please contact
tory construction, which helps to meet the            vide maximum benefit to the building fab-         the Insulated Render and Cladding
Egan Report requirements.                             ric. It does not create an adverse dew point      Association, at PO Box 12, Haslemere,
   Building with insulated render and                 situation and keeps the building in a good        Surrey GU27 3AH:Tel: 01428 654011; fax:
cladding uses specialist subcontractors,              state of health. As long as it is mounted on      01428               651401;              e-mail:
absolving the builder of responsibility for the       the outside of the building, the insulation       incaassociation@aol.com;               website:
outer envelope. Indeed, the shortage of               can be increased almost without limit.            www.inca-ltd.org.uk




                                                               Master Builder February 2004                                                                 29

				
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Description: Outside interest