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1 000 000 m³: Stora Enso produces record quantity of CLT in Austria

Stora Enso just recently broke the one million m³ mark of CLT (Cross Laminated Timber) produced at its two Austrian sites in Ybbs an der Donau and Bad St. Leonhard. As a construction material, wood is bang on trend at the moment, thanks to urbanization and growing environmental awareness. It is a significant contributor in the fight against climate change and to protect our environment.

1 million m³ CLT sounds like an awful lot, but what exactly does that mean? This amount is roughly the same volume as 1 000 four-storey buildings each containing 50 units – that’s 50 000 apartments! Stora Enso’s two Austrian plants in Ybbs an der Donau and Bad St. Leonhard have done the honors in producing this vast amount of CLT since they were set up in 2012 and 2008 respectively. Global demand for CLT is now so huge that Stora Enso Wood Products will be topping up its annual capacity of 100 000 cubic meters to 12 000 cubic meters at the Ybbs/Donau site. Europe’s largest supplier of timber products also opened a new CLT plant in Gruvön, Sweden, earlier this year. The new plant is Stora Enso’s third CLT production site and has a capacity of approx. 100 000 m³ per year – that’s equivalent to material for around 4 500 standard 75m² three-room apartments. “The construction industry is currently experiencing a peak. Wood is extremely popular: it grows steadily, can be used in all sorts of applications, and helps to protect the climate – we are responsible for the generations that will come after us,” says Gernot Weiß, CLT business line manager at Stora Enso. Cities are facing plenty of challenges as a result of growing urbanization: for every floor in concrete, there could be three storeys added to the building.

Positive impact for all stakeholders
“CLT enables us to build more quickly than by using other construction materials; this has many advantages for building companies in terms of shortening funding periods and five times less transportation necessary. Plus, neighbors have something to be happy about as building with CLT means less noise and dust pollution. Of course, using wood is also good for the inhabitants themselves, as the indoor climate and room atmosphere is much healthier thanks to the use of this natural product,” Weiß goes on.

Building with wood reaching public consciousness
People in society are becoming more and more aware of the importance of saving resources. Alongside the latest state-of-the-art technological advances, the world’s oldest building material is evolving into a material of the future. By upping their wood usage, towns and villages are saving masses amounts of carbon, easing the strain on the environment.

Wood is the No. 1 CO2 storer
To produce one million cubic meters of the engineered wood product CLT, numerous trees were required as raw materials – which will regrow in Austrian forests in just four weeks. Another advantage of this renewable material is that it stores a hefty amount of CO²: during the growth phase, 730 000 tons of CO² can be filtered; even the processed CLT can store 200 000 tons of carbon in the building.

Knowing the origin
Stora Enso is absolutely committed to sustainable forest management, and that is why it knows exactly where every single tree comes from. Being PEFC™ certified means that the entire processing chain is obliged to commit to ecologically, economically and socially sustainable forestry management. And for every tree harvested, it has to be ensured that new trees grow back. This enables the forest owner to maintain a healthy forest through continual reforestation. Stora Enso is Europe’s largest producer of wood products and to date has supplied CLT for over 15 000 projects all across the globe. Enhanced CLT production capacity, investment in new technologies, the development of new digital services and tools as well as building concepts for offices, residences and schools make Stora Enso a leading provider of innovative solutions for building with wood.

Update CLT by Stora Enso: The new ETA 2019 certificate is here!

On the occasion of opening the new production site in Gruvön/Sweden, the ETA (European Technical Assessment) has been updated. Changes are mainly focused in correlation with the new manufacturing site, that have to be included into the appendix of the ETA or the ETA itself. A prerequisite is, however, having executed tests on the material that is produced at the new site.
At the below link, you will find a detailed comparison of the amendments made. The currently applicable ETA for CLT by Stora Enso is therefore “ETA-14/0349” (06/2019).
Click here for further information.

Stora Enso evaluates expansion in Wood Products

Stora Enso has initiated feasibility studies for a possible CLT unit in connection with its Ždírec mill in the Czech Republic and a new construction beam unit to be located at the Ybbs mill in Austria. Stora Enso also plans to consolidate production to increase focus on efficiency and to streamline the asset base.
Stora Enso continues its transformation into a leading provider of innovative wood-based solutions. The transformation in Wood Products includes both selected growth in added-value businesses and consolidation of production to increase focus on efficient integrated production.
The proposed expansion in Ždírec would add a total annual capacity of approximately 120 000 m3 of CLT. It would be Stora Enso’s fourth CLT unit, following the inauguration of the Gruvön CLT unit in Sweden earlier this year. The study is expected to be completed by the end of 2019.
In Ybbs, the planned expansion would add a total annual capacity of 60 000 m3 of construction beams. The new beam product would be offered to Building Solutions’ customers and sold as a solution together with CLT and LVL. The feasibility study is expected to be completed by the end of the first quarter of 2020.
If the investments are approved following the feasibility studies, the capital expenditure is estimated to be approximately EUR 90 million. The transformation in Wood Products also includes the earlier announced plans to close the Kitee sawmill with a possible consolidation of spruce production to Varkaus, as well as the divestment of assets related to Thermowood production at Uimaharju sawmill in Finland. Stora Enso will consolidate the Thermowood production to Launkalne mill in Latvia.
“We see extensive potential for our engineered wooden materials in the market, and an opportunity for further growth in the multi-storey building segment. Our products substitute fossil-based materials and demand for our premium, renewable products, our proven massive wood components as well as our building concepts is constantly increasing. Consolidation would enhance cost efficiency, optimised raw material usage, efficient automatised production, synergies between mills and a strong market driven portfolio of products and services,” says Jari Suominen, Executive Vice President of Stora Enso’s Wood Products division.

Stora Enso will bring renewable materials to Seefeld Nordic World Ski Championships 2019

The renewable materials company Stora Enso will be the Presenting Sponsor for FIS Nordic World Ski Championships from 19 February to 3 March 2019 in Seefeld (Austria). The sponsorship provides Stora Enso with the opportunity to contribute to a sustainable sports event and showcase its renewable solutions in various applications. For more information about the event, click here.

Photo: Austria Ski WM- und Grossveranstaltungs GmbH

Stora Enso takes part in Bau Munich 2019

BAU Munich is the world’s leading trade fair for architecture, materials and systems and will be taking place from 14 to 19 January 2019 in Munich (Germany). Every two years, the construction fair is the meeting place for the entire construction industry. Over 250,000 participants from more than 45 countries meet together at this event — and Stora Enso is part of it. We will be showcasing our wood products and online DigiTools for timber design and structures on our dedicated stand.

Photo: Messe München GmbH

New CLT mill taking shape in Gruvön

Stora Enso’s investment in production unit for CLT in Gruvön, Sweden, is proceeding according to investment schedule. The construction of the new CLT mill located alongside the Gruvön sawmill started with groundworks in October 2017. “We want to be role models in using wood in construction. Other than the groundwork and reinforced concrete columns, we are building the whole new mill out of CLT by Stora Enso,” says Pär Larsson, the Mill Manager for Gruvön. “I think this is a unique opportunity we have here to build our premises sustainably,” he continues. The production is scheduled to begin during the first quarter of 2019. Stora Enso announced in July 2017 that it will invest EUR 45 million in a new production unit for cross laminated timber (CLT) in connection with its Gruvön Mill in Sweden. The investment will further enhance Stora Enso’s position as a global provider of high quality engineered wooden elements and as a market leader in CLT.

Stora Enso participates at the URBAN FUTURE global conference 2018

Europe’s largest event for sustainable cities — the URBAN FUTURE global conference — takes place from February 28th to March 2nd, 2018 in Vienna. The world’s most passionate city changers — over 3,000 participants from more than 50 countries — meet at this event and Stora Enso is part of it. We are showcasing our wood products at a dedicated stand and participate in a speaker’s session about how to enable innovative buildings.

Click here for our Press Release.

NEW: Study: The future of Timber Construction – CLT (Cross Laminated Timber)

This study serves to identify present and future trends relevant to the future of timber construction. If the terms naturalness, comfort and ecology are considered in the context of using materials for building future-oriented architecture, then it becomes apparent relatively quickly that this must concern the raw material wood. Wood is trending: it is renewable, can be used in many ways and makes a contribution to climate protection as part of our responsibility to the generations after us. It seeks to widen the perspective of issues already known to the industry and raise awareness of social and technological developments and trends. This study develops an exciting perspective, highlights prospective opportunities and potential. A “Must read” for everyone who wishes to be actively involved in shaping the future of the timber construction industry.

Click here for the study.

Stora Enso sponsors the 2017 FIS Nordic World Ski Championships

As Finland prepares to celebrate 100 years of independence, Stora Enso is engaged as the presenting sponsor of the Nordic World Ski Championships from 22nd February to 5th March in the Finnish town of Lahti. We lead the way towards an ecological future with our innovative and high-quality building material, CLT, produced at Ybbs an der Donau (Austria).

Having built the administration building for the World Championships in the Swedish town of Falun in 2015, Stora Enso, the leading provider of renewable solutions in wood, paper, biomaterials and packaging, once again points the way towards greater sustainability at the Nordic World Ski Championships. Austria also plays a critical role at the championships where a wooden shelter or “Laavu” has been built with CLT produced in Austria. The shelter is an example of best practices in using CLT to meet strict architectural demands. “It is particularly important to raise public awareness of sustainable building, and the Nordic World Ski Championships in Lahti provide a great opportunity to present Austrian expertise to a wide international audience”, says Herbert Jöbstl, SVP of Stora Enso Wood Products in Central Europe. 700 athletes from 60 countries competing for medals and around 500 million television viewers from all over the world will see the Stora Enso logo displayed throughout the entire competition as well as on the race bibs and the banners running along the side of the race tracks.

Novità: Stora Enso lancia nuovo software di calcolo «Calculatis»

Nel novembre 2016 è uscito il nuovo software di calcolo della Stora Enso. Tutti i moduli già presenti nel programma precedente «CLTengineer» sono stati ripresi, con l’aggiunta di moduli di progettazione integrativi. D’ora innanzi, per esempio, si potranno calcolare anche le tipologie di connessioni più comuni utilizzate con il CLT. Fra le caratteristiche antincendio figurano ora anche i criteri E (integrità) e I (isolamento). Inoltre, d’ora in poi sarà possibile effettuare calcoli di fisica delle costruzioni. Come primo passo si è integrato un calcolatore del valore U. Oltre alle migliorie tecniche si è ampliata la gamma di materiali considerati. Il nuovo software permette, per esempio, di operare calcoli anche sul microlamellare (LVL). In termini di standard di calcolo strutturale il pacchetto aggiunge il catalogo delle norme SIA svizzere.

Clicca qui per accedere al software di calcolo.

Stora Enso at the World Conference on Timber Engineering (WCTE) 2016

The World Conference on Timber Engineering is set to take place in Vienna from 22 to 25 August 2016. The organiser, Vienna Technical University (TU), is expecting 1,300 participants at the world’s largest timber construction event. This is the most prestigious venue for presentations and discussions around the latest technical and architectural developments and innovations in the timber construction industry. The renowned international event attracts researchers, architects, engineers, consultants and building contractors, entrepreneurs, project developers, manufacturers and suppliers from all over the world.
At the Stora Enso stand in the Arcade Court of the University of Vienna we will be exhibiting the following products:

- LVL (Laminated Veneer Lumber)
- CLT (Cross Laminated Timber)
- and KVH (solid structural timber)

We look forward to welcoming you at the conference.
For more information about the event, click here.

Nuova composizione pannelli CLT prodotti da Stora Enso.

A partire dal 01. Giugno 2016 verrà cambiato la composizione del pannello CLT da 80 mm con 3 strati (sia L che C) da 30 / 20 / 30 a 20 / 40 / 20.La composizione realizzata fino ad oggi (30/20/30) sarà ancora possibile da ordinare ma questo dovrebbe essere comunicato in modo esplicito al momento dell’ordine.
Cliccate qui per vedere tutte le composizioni standard dei pannelli CLT

Stora Enso to sponsor the Lahti 2017 FIS Nordic World Ski Championships

The renewable materials company Stora Enso will be the presenting sponsor of the FIS Nordic World Ski Championships in Lahti in 2017. Stora Enso and Lahti2017 together aim to lead the way in promoting and supporting sustainable events. The Finnish city of Lahti will host the Nordic World Ski Championships in 2017 for a record seventh time. The Championships will take place between 22 February and 5 March 2017. The pre-World Championships, World Cup games in cross country skiing, ski jumping and Nordic combined will be held on 19-21 February 2016, also in Lahti.
“This collaboration is especially important to Stora Enso because we have a long history in Finland even before the country’s independence in 1917,” says Karl-Henrik Sundström, CEO of Stora Enso. “We are honored to have a role in creating a successful international sports event in the year that Finland celebrates 100 years of independence.”
“Sponsoring the Nordic World Championships in Lahti is a great match for us because our roots are in the Nordic forests where cross country skiing takes place. We can contribute greatly to a sustainable event with our renewable materials: packaging, biomaterials, wood products and paper.”

Stora Enso lancia nuovo software di calcolo «CLTengineer»

Uno strumento online gratuito coadiuva la progettazione e la misurazione dei valori statici di fabbricati in legno lamellare a strati incrociati (CLT). Da anni il CLT di Stora Enso trova impiego in progetti d’eccellenza e per la sua sostenibilità si è affermato come materiale edile del futuro. Per permettere agli architetti e agli ingegneri statici, oltre che ai carpentieri di trarre il massimo dall’innovativo materiale, Stora Enso mette a disposizione da subito «CLTengineer», lo strumento online gratuito e multipiattforma per calcolare esattamente solai, tetti, pilastri, travi, architravi, appoggi, travi continue e pannelli in CLT. Grazie alle più recenti scoperte nell’ambito della ricerca sui materiali e ai risultati di approfonditi test sulle caratteristiche statiche del legno lamellare a strati incrociati, «CLTengineer» diventa uno strumento di progettazione irrinunciabile per gli addetti ai lavori del settore dell’edilizia in legno.

«CLTengineer» sostituisce il software finora in uso con l’aggiunta di nuove funzionalità
Già in passato Stora Enso aveva messo a disposizione un software di calcolo del CLT che ha finora trovato largo impiego fra gli ingegneri per una vastissima gamma di progetti. Da subito gli utenti potranno effettuare gli stessi calcoli in «CLTengineer». In aggiunta, i moduli sono stati ampliati con documentazioni nazionali sugli eurocodici e dotati di nuove funzionalità.
Oltre ad imporsi per l’utilità, «CLTengineer» conquista anche per il suo ammiccante design e la facilità d’uso. I risultati delle operazioni di calcolo, per esempio, possono essere visualizzati in forma breve o lunga e, volendo, si possono anche scaricare e stampare in formato pdf.

Clicca qui per aprire «CLTengineer»!

Puukuokka awarded with the Finlandia Prize for Architecture – constructed with Stora Enso CLT

The Finnish Association of Architects (SAFA) has awarded Puukuokka with the Finlandia Prize for Architecture in 2015. This eight-storey wooden building located in the city of Jyväskylä has been jointly realized by Stora Enso and Lakea. The architectural design is made by OOPEAA Architects. The award-winner was selected by the Finnish composer Kaija Saariaho.
”Puukuokka unites the aspects that I value in architecture as well as in life. Puukuokka is a bold and ambitious work including new construction technology, but it is also humane and aims toward ecological choices and improvement of quality of life,” comments Kaija Saariaho on her motivation for the selection.
”The Finlandia Prize for Architecture is a great honor for wooden construction. We are extremely proud to participate in the realization of Puukuokka and at the same time promoting modern wooden construction,” Jari Suominen, Head of Stora Enso Wood Products says.

Wooden housing is pleasant for all senses
Kaija Saariaho was pleased by the comprehensiveness of Puukuokka: ”I chose a building that pleased me intuitively and corresponds to my aims and values. Visiting the home of one resident, its coziness and outstanding acoustics confirmed this for me. Puukuokka is a building where I enjoyed myself with all my senses.” The 8-storey Puukuokka is constructed with modular CLT (Cross Laminated Timber) elements produced by Stora Enso Wood Products Hartola unit. The building includes 58 apartments that provide a pleasant living environment utilizing renewable building materials.
“Wood is the building material of the future for sustainable living,” Jari Suominen concludes.
The Finlandia Prize for Architecture was established in 2011 by SAFA, the Finnish Association of Architects. The Finlandia Prize for Architecture is awarded to a design or renovation design for an outstanding new building or building complex that has been completed within the past three years. The Prize promotes the appreciation of high-quality architecture and highlights the importance of architecture in producing cultural value and increasing well-being.

Click here for more information!

Five CLT multi-storeys rising in Trondheim, Norway

Five buildings, each nine storey high are soon to be raised with CLT in Trondheim, Norway. “Moholt 50/50 is already the third location where we are building wooden multi-storey houses for students in Norway,” says Bernd Troppmann responsible for the Norwegian market at Stora Enso Building Solutions. The first deliveries arrived Trondheim beginning July and in total 75 truckloads full of wall elements and 50 train wagons of floors and roofs resulting in 6,500 m³ of Stora Enso CLT. These five nine storey student houses will be accompanied by a library building and a kindergarten. According to the plan, it will take only three quarters of a year to finalize. Trondheim is the third Norwegian University city after Haugesund and Remmen where Stora Enso Building Solutions is providing CLT for student houses. Norway has a long tradition of building with wood.

Click here for more information.

Statement on Sustainability – CLT at Expo in Milan

“Feeding the Planet, Energy for Life” – that’s the theme of this year’s World Expo in Milan. Some 20 million visitors are expected. From 1 May to 31 October 2015, 145 nations and five international organisations will be presenting new technologies and pioneering ideas in their pavilions, each covering an area between 500 and 4,500 m² in size.

Slovenian pavilion built with Stora Enso’s CLT
Particularly eye-catching is the Slovenian pavilion with its theme “I feel sLOVEnia, Green. Active. Healthy,” which has been constructed primarily from wood and glass. The architects have combined a wood frame construction with load-bearing CLT elements produced by Stora Enso. It is no coincidence that CLT (Cross Laminated Timber) was chosen: The building material is considered a true all-rounder in the timber industry. And with its wooden pavilion Slovenia is consciously positioning itself as a country with a rich “wooden heritage.” On the one hand, Slovenia is one of the most densely wooded countries in Europe. On the other hand, wood as a material looks back on an ancient tradition here.
The world’s oldest wooden wheel, for example, was made around 5,200 years ago in Slovenia. CLT as a product, however, represents the most innovative technology in wood construction.

CLT inspires audiences at Expo 2015
The wooden pavilion, which covers an area of 800 m² was constructed by the Slovenian architectural practice “Sono Architects”. Sono Architects unites a new generation of young architects, who are committed to the construction of modern, high-quality buildings. The basis of these buildings is a mix of architectural theory, including research studies, the search for suitable locations as well as constant testing of modern materials and new construction methods. The pavilion’s pyramidal design with its geometric shapes evokes the landscape of Slovenia, where alpine mountains, Pannonian plains and Mediterranean hills combine to create fertile farmlands. This rich cultural landscape is represented by five prismatic gables.
Stora Enso’s CLT was chosen because: “It is a building material that is perfect for quick and clean constructions. The high degree of prefabrication shortens the construction period, reduces dust and noise pollution while also saving on costs,” says Herbert Jöbstl, SVP of Stora Enso Wood Products GmbH in Central Europe. Furthermore, the Expo’s theme is almost an obligation to adopt ecological values and sustainability. The country pavilions should create harmony between nature and progress as well as innovation and tradition. Slovenia’s contribution represents an intact ecosystem, in which natural resources are key for sustainable nutrition and quality of life.
In addition to the generous amount of space created inside the pavilion, there is another crucial advantage: The healthy climate in wooden buildings has been shown to have positive affects on human well-being. CLT creates a good ecological balance because wood is a renewable resource, which stores CO2 long-term. The timber used by Stora Enso in the production of CLT comes from certified sources. The pavilion’s building safety was also an important consideration and one that is fully addressed by the use of CLT elements in the construction.

Photo: Sono Architects

The Finnish Nature Centre Haltia, constructed with Stora Enso CLT awarded in the European Museum of the Year Award 2015 ceremony

Finnish Nature Centre Haltia, built using Stora Enso’s cross-laminated timber (CLT) boards was one of the six winners in European Museum of the Year Award 2015 ceremony. It is also the first meseum awarded with Special Commendation for Sustainability. The first prize, European Museum of the Year Award 2015 went to Rijksmuseum, Amsterdam, The Netherlands. The Finnish Nature Centre Haltia was praised on the role not only of educating young people about nature, but also addressing the question of man’s capability to cope on this planet, and carries a message for the future about the possibility of long term sustainability. From its building materials to its energy-saving green technology, Haltia has been planned as an exemplar for the relationship between man and nature. The construction method and material choice are important aspects of the eco-friendliness of the nature centre. Thanks to Stora Enso’s CLT, the building is air-tight and protected against moisture, and it has good thermal and acoustic properties. Heating, cooling and lightning are also implemented with minimal energy usage. The round shape of the building, for example, diminished the heating waste in winter and the positioning of the terrace reduced cooling in the summer.

More business in Varkaus mill site

For 33 years, the hall was equipped with Paper Machine 4 (PM4) producing newsprint. Today, it is a quiet and dusty place. The echo fades away before reaching the other end of the 300 metre long building. But that will change. The premises will soon be brought back to life when Stora Enso invests in a new LVL production line creating new job opportunities for the region. Varkaus is a location where transformation is clearly visible for Stora Enso and the forestry industry. In the former PM4 building, Stora Enso Wood Product’s will start a production line for wooden building elements during the second quarter 2016. The line will produce LVL panels based on peeling technology. ”LVL is a mature and well-known technique, but Stora Enso’s innovation enables cost-efficient wooden building elements as a complement to CLT in non-visual applications. LVL will expand our product portfolio and strengthen our market position in building elements,” explains Jari Suominen, Head of Stora Enso Wood Products.


Beneficial location

Varkaus has been at the heart of the Finnish forest industry for decades, and was chosen for the new production line for numerous reasons. “Varkaus is an ideal location for this kind of production.  Besides utilising the available premises and the industrial infrastructure and efficient logistics, we see a clear benefit in terms of raw material availability and wood sourcing optimisation. The panel production will be using spruce and birch, partly also in sizes that we have not been able to utilise to the fullest before,” describes Mill Director Jarkko Tehomaa from Varkaus. In terms of logistics, on top of good road and rail connections the in-site harbour at Varkaus will enable efficient exports. The estimated total employment impact for the region is 150 full-time jobs, out of which approximately 80 will be directly employed by Stora Enso. “I’m very pleased to announce this investment which opens up new opportunities to Varkaus region and our employees,” says Tehomaa.


Building the future

In about a year from now, the empty premises of the old PM4 as well as the nearby storage and thermo-mechanical pulp plant premises will be filled with new equipment. It will not be quiet anymore. After a three-year ramp-up phase, the production line will have a yearly capacity of 100 000 m³. “The panel production line, together with the newly invested container board machine will bring Varkaus production close to the high peak years back in the ‘old days’. We will use mainly the same raw material, but the big difference is that we are producing something else. The end product is different,” Jarkko Tehomaa says. The total investment to the new wooden building element production line will be EUR 43 million. With this, Stora Enso strengthens its position as a global provider of high quality engineered wooden elements. “We believe in wood as the building material of the future. Wood is energy efficient, renewable and carbon-neutral. Engineered wood products are key in tomorrow’s wood products offering. As the population continues to grow and non-renewable raw material resources decrease, wood offers a sustainable solution to fulfil the needs of construction industry,” concludes Suominen.


New Varkaus integrate in figures:

Saw Mill white wood timber 260 000 m³
Pulp Mill unbleached kraft pulp 310 000 t/a *)
Paper Mill containerboards 390 000 t/a *)
LVL Mill LVL 100 000 m³/a (start-up 2016)
Personnel current 350 (including Efora maintenance operations)
LVL 80
Wood Usage spruce, pine, birch approx. 2,1 million m³ (after investments)

*) after mill conversion to containerboards Q4/2015

Australia Timber Design Awards 2014

Store Enso Wood Products received at the “Australia Timber Design Awards 2014″ for the project “Library at the Dock” two awards in the categories “Public or Commercial Building” and “Sustainability”.

A tenuta d’aria già con tre strati

Nuova conferma per gli elementi in legno massiccio CLT della Stora Enso in tema di tenuta d’aria. Lo attesta un recente esperimento condotto presso il politecnico di Graz.

Già nel 2008 un test di tenuta eseguito su un elemento in legno massiccio CLT della Stora Enso faceva riscontrare che: «le giunzioni esaminate come anche l’elemento in sé presentano un alto grado di ermeticità all’aria. A seguito dell’elevata densità, le correnti d’aria passanti per le due varianti di giunto considerate e attraverso la superficie ininterrotta del pannello sono risultate essere al di sotto del valore misurabile.» Nell’ultimo test il politecnico di Graz ha verificato quali conseguenze sulla tenuta d’aria possano avere l’eventuale formazione di fenditure a seguito di fenomeni di essiccazione del legno o la lavorazione meccanica profonda di elementi CLT. Al banco di prova, condotto secondo le normative europee su di un elemento a soli tre strati, si è nuovamente confermato che, nonostante la presenza di fenditure e solchi di lavorazione, l’aria passante per l’elemento era inferiore al valore misurabile!
Il risultato ribadisce l’enorme vantaggio degli elementi in legno massiccio CLT della Stora Enso, che non sono ermetici all’aria soltanto con strutture a 5 o più strati, ma che possiedono questa proprietà già a partire dai tre strati! E questo è un vantaggio decisivo del CLT.

Per ulteriore materiale informativo consultare la rubrica Media & Downloads.

Costruire in tutte le stagioni con il CLT di Stora Enso

Nuove prospettive per il settore edilizio grazie al prolungamento della stagione lavorativa. Merito del CLT.
In Austria, si sa, l’andamento del settore edilizio è soggetto a forti oscillazioni stagionali: il tasso d’impiego e la produzione di ricchezza, infatti, variano direttamente in funzione delle condizioni meteorologiche. Sono ca. 70.000 i lavoratori che ogni anno nei mesi invernali ingrossano le file dei disoccupati stagionali perché con la fine dell’estate calano rapidamente anche le commesse. Negli ultimi anni, in particolare, l’arrivo anticipato dell’inverno e periodi di freddo eccezionalmente lunghi hanno inflitto un duro colpo al settore edile, in quanto hanno abbreviato ulteriormente il periodo lavorativo.
Continuare a lavorare anche nella stagione fredda, tuttavia, si può grazie all’affermato sistema con pannelli in lamellare massiccio a strati incrociati «CLT» di Stora Enso. L’azienda è leader del settore e dai suoi stabilimenti produttivi proviene il CLT utilizzato per la realizzazione di rinomati progetti internazionali. Il CLT consente di avere un alto grado di prefabbricazione che, oltre ad offrire possibilità quasi illimitate in fatto di progettazione, stile e architettura, riduce fino al 40% i tempi di messa in opera in cantiere. In più, gli elementi già predimensionati e sagomati possono essere montati a prescindere dalla stagione edilizia classica. Il CLT è il materiale da costruzione del futuro e rappresenta una promettente alternativa per le aziende e gli addetti del settore edilizio nei periodi in cui le condizioni meteorologiche sono avverse.
Il potenziale del prodotto è grande. Come attesta un’indagine condotta nel 2012 dall’istituto demoscopico market, la popolarità del legno come materiale da costruzione è in continua crescita. Ben l’80% degli intervistati ne apprezza le caratteristiche. Tra i costruttori privati si è registrato un aumento delle case in legno del 10% a partire dal 2009. E anche nell’edilizia pubblica si punta sempre più sul legno. Anzi, è proprio nei grandi cantieri e nel contesto urbano che il CLT fa valere appieno le proprie prerogative. Che si tratti del recupero di un sottotetto o della costruzione di un edificio a più piani collocato in una zona urbana, la scelta ricade sempre più spesso sul CLT. Buone notizie per il settore delle costruzioni, dunque, finalmente in grado di invertire il trend della disoccupazione stagionale e della mancata produzione di ricchezza ricorrendo sempre più spesso al CLT come materiale da costruzioni per tutte le stagioni.

Simulazione di un sisma

Un edificio a tre piani realizzato in CLT è stato poggiato su una piattaforma vibrante e sottoposto a scosse simulanti terremoti di varia grandezza. Il prototipo ha superato brillantemente tutti e 32 i test.

La stabilità di una casa costruita in legno massiccio con lamellare a strati incrociati, alias CLT, è stata testata a Lisbona nel febbraio del 2013 nell’ambito di una prova un po‘ particolare. Simulando terremoti di diversa magnitudo su di una piattaforma vibrante, si è messa alla prova la stabilità di un edificio in legno massiccio a tre piani dell’altezza di pressappoco otto metri. Particolare attenzione è stata rivolta alle giuntature tra gli elementi in legno, che in caso di terremoto sono particolarmente soggette a sollecitazioni. L’edificio testato era alto circa otto metri e aveva una superficie di ca. 90 metri quadri distribuiti su tre piani. In totale si sono simulati 32 eventi sismici, di cui ca. 15 con intensità superiore a 0,2 g ed uno addirittura con un’accelerazione puntuale di 0,8 g. A conclusione dell’intera serie di test l’edificio non presentava danni di rilievo, il che sottolinea come il CLT sia il materiale da costruzioni ideale per le aree a rischio sismico.

Progetto CLT a Graz, Austria

Nel cuore di Graz stanno sorgendo 12 edifici in legno CLT e argilla con solai in CLT a vista. Per la realizzazione degli edifici a tre, quattro e cinque piani si impiegherà un totale di 4.400 m³ di CLT, di cui 2.000 m³ in qualità industriale a vista. Il complesso conterà 143 appartamenti, molti con giardino e/o balcone. Il progetto ha ottenuto la certificazione «klima:aktiv Gold» e spicca per una soluzione alternativa in fatto di energia, dato che prevede lo scambio energetico con un vicino supermercato. Anche in fatto di elettromobilità è stata presentata un’idea.

Library at the Dock – Melbourne, Australia

Il primo edificio pubblico in CLT, la Library at the Dock, è attualmente in fase di costruzione a Melbourne, in Australia. La biblioteca, affacciata sulla Victoria Harbour, è uno straordinario esempio di architettura e soddisfa tutti i requisiti di sostenibilità, motivo per cui riceverà anche l’ambita qualifica «Five Star Green Rating» attribuita dal Green Building Council of Australia. L’ultimazione del progetto è prevista per il dicembre 2013, l’apertura al pubblico per l’inizio del 2014. La biblioteca fa parte di un progetto infrastrutturale di più ampie dimensioni.