Las páginas de Stora Enso utilizan cookies para ofrecer a los usuarios la mejor experiencia posible. Al continuar usando este sitio web, está aceptando el empleo de estas cookies. Puede cambiar en cualquier momento los ajustes del navegador. Para obtener más información sobre las cookies, puede consultar nuestra política de privacidad y cookies.




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.

Nuevo: Stora Enso lanza su nuevo software de medición Calculatis

En noviembre del 2016 Stora Enso ha lanzado un nuevo software de medición. Todos los módulos de CLTengineer, el software predecesor, se mantienen. El nuevo paquete de software se ha completado con nuevos módulos de medición. A partir de ahora se pueden medir con él también los tipos más corrientes de unión. A la medición de combustión se le han añadido los criterios de integridad (E) y aislamiento (I). Ahora, además, son posibles las mediciones físico técnicas. Se ha incorporado en primera instancia una calculadora del valor U. A todas estas mejoras técnicas hay que sumar además las ampliaciones relativas a los materiales. La madera laminada estructural (MLE) puede también crearse y medirse. Con respecto a los estándares de medición en ingeniería estructural, al paquete de software se le ha incorporado la normativa suiza SIA.

Pinche aquí para ir al software de medición.

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.

Nueva combinación de capas de CLT de Stora Enso

A partir de 1 de junio 2016 vamos a cambiar la combinación de capas individuales en los paneles de CLT de tres capas y 80 mm de espesor (80 C3s y 80 L3s). La nueva combinación estándar será 20 / 40 / 20 mm. Mantendremos la combinación anterior (30 / 20 / 30 mm) en nuestro sistema, pero hay que mencionarlo explicitamente en el pedido.
Por favor, hagad un clic aquí para encontrar nuestros paneles y combinaciones estándar.

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 lanza su nuevo software de medición CLTengineer

Una herramienta online gratuita para ayudarle a planificar y medir la estática de los proyectos de edificación con madera contralaminada (CLT). La madera CLT de Stora Enso lleva años demostrando en proyectos eminentes que es el material de construcción sostenible del futuro. Para que los arquitectos e ingenieros expertos en estática, pero también los carpinteros, puedan aprovechar todas las posibilidades de este innovador material, Stora Enso les ofrece a partir de ahora la herramienta en línea CLTengineer, gratuita y para múltiples plataformas, que les servirá para dimensionar correctamente los forjados, tejados, apoyos, vigas, superposiciones, soportes, vigas continuas o tableros de CLT. Los últimos resultados de la investigación de materiales, así como los exámenes exhaustivos sobre el comportamiento estructural de la madera contralaminada han sido esenciales a la hora de convertir a CLTengineer en una herramienta imprescindible de planificación para los técnicos en edificaciones de madera.

CLTengineer viene a sustituir con funcionalidades ampliadas a la herramienta anterior «Medición de CLT»
Hasta el momento, Stora Enso ofrecía con el programa «Medición de CLT» una herramienta de medición para la madera contralaminada que los ingenieros han utilizado intensamente para los más diversos proyectos. Ahora los usuarios pueden realizar esos mismos cálculos con CLTengineer. Pero, además, se han añadido módulos con anexos nacionales de la serie de normalización de Eurocódigos, así como nuevas funciones.
CLTengineer destaca no solo por su funcionalidad, sino también por su atractivo diseño y facilidad de uso. Los resultados de todos los cálculos se pueden visualizar, por ejemplo, de forma abreviada o completa y, si se desea, se pueden descargar e imprimir en un archivo PDF.

Pulse aquí para ir a 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”.

Estructura hermética al aire con solo tres capas

Los elementos de madera maciza CLT de Stora Enso vuelven a convencer en términos de hermeticidad. La universidad politécnica de Graz lo ha constatado en un ensayo realizado recientemente.

Ya en el año 2008 se sometió a una prueba de hermeticidad un elemento de madera maciza CLT de Stora Enso: “Las juntas examinadas y el elemento en sí presentan una elevada estanqueidad. Debido a la elevada hermeticidad, no se encontraron flujos volumétricos mensurables a través de las dos variantes de juntas y por la superficie no interrumpida”. Actualmente la universidad politécnica de Graz ha aclarado los efectos que ejercen en la hermeticidad las grietas que pueden producirse al secarse la madera y el trabajo mecánico profundo de los elementos de CLT. De hecho, en la prueba pudo demostrarse conforme a las normas europeas en un elemento de tan solo tres capas que no se producen corrientes de aire mensurables a pesar de las grietas y procesamientos.
Todo ello confirma la enorme ventaja de los elementos de madera maciza CLT de Stora Enso, que no solo son herméticos con una estructura de 5 o más capas, sino que ya presentan esta propiedad con 3 estratos. CLT demuestra aquí claramente su primacía.

En Medios de comunicación y descargas encontrará más información.

Con CLT de Stora Enso se puede construir todo el año

El uso de CLT amplía la temporada de obras y abre nuevas perspectivas en el sector de la construcción.
Es un hecho conocido que el sector de la construcción en Austria está sometido a grandes fluctuaciones estacionales, ya que el índice de empleo y el valor generado dependen directamente de la climatología. Una mano de obra en torno a 70.000 personas pasa a engrosar las cifras del paro estacional durante los meses del invierno porque los pedidos en cartera descienden en picado cuando la temporada estival toca a su fin. En los pasados años, un comienzo temprano de los rigores invernales y periodos prolongados de frío han hecho mella en la construcción, acortando aún más la época de obras.
Una forma muy valorada en la práctica de aprovechar el semestre invernal para proyectos de edificación es construir con elementos de madera maciza CLT. Stora Enso lidera este sector y suministra madera CLT proveniente de sus propias factorías también para diversos proyectos de gran prestigio internacional. CLT permite un alto grado de prefabricación y ofrece unas posibilidades casi ilimitadas en términos de filosofía constructiva, estilo y arquitectura. El tiempo de edificación en la obra se puede abreviar hasta un 40% gracias a la preproducción en las fábricas. Además, estos elementos prefabricados se pueden montar fuera de la temporada de obras tradicional. CLT es el material de construcción más prometedor porque representa para las empresas y trabajadores del sector de construcción una alternativa de futuro cuando se trata de adaptarse a los cambios de la climatología.
El potencial existente es enorme. Un sondeo realizado en el 2012 por el organismo de estudios de mercado market muestra un crecimiento continuo de la preferencia por la madera como material de construcción. El 80% de los encuestados ya tiene, de por sí, un buen concepto de este material. En el apartado de los constructores particulares se ha registrado un aumento del 10% en casas de madera desde el año 2009. También en las edificaciones municipales se observa una tendencia en pro de la madera. Especialmente en los proyectos de obras de mediana envergadura, también en zonas urbanas, el CLT despliega todas sus ventajas. Ya sea en la rehabilitación de buhardillas o para edificaciones de varias alturas en zonas urbanas: la decisión final recae cada vez con mayor frecuencia en favor del CLT. Esta buena disposición es una gran noticia para el sector de la construcción. Porque una mayor frecuencia de uso del CLT — un material para todas las estaciones — ejerce una repercusión positiva directa sobre las fluctuaciones estacionales en las cifras de paro y de negocio.

Simulación sísmica

Un edificio de tres plantas construido de CLT fue sometido a distintas simulaciones de seísmos utilizando una mesa de vibraciones. Este objeto de ensayo ha pasado sin problemas las 32 pruebas.

En febrero del 2013, en una prueba sin igual en Lisboa, se sometió a prueba la «resistencia» de una casa de edificación de muros portantes a partir de madera contralaminada, conocida por su abreviatura CLT. Una mesa de vibraciones puso a prueba en varios seísmos simulados una casa de madera maciza de tres pisos y casi ocho metros de altura. Se dedicó especial atención en las uniones de los elementos de madera, porque en un terremoto son las que más sufren. El edificio objeto del ensayo alcanzaba casi ocho metros y tenía una superficie de unos 90 metros cuadrados repartidos en tres habitaciones de tres plantas. En total se provocaron 32°seísmos. 15 de ellos superaron 0,2 g y en uno de ellos, incluso, pudo alcanzarse una aceleración puntual de 0,8 g. Después de todas las pruebas realizadas no se pudo constatar ningún daño significativo en el edificio, lo que demuestra que CLT es el material ideal especialmente en las zonas con riesgo sísmico.

Proyecto de CLT en Graz, Austria

En el mismo centro de la ciudad de Graz se están erigiendo 12 edificios de CLT con una estructura de madera y adobe y forjados vistos de CLT. Estas edificaciones de tres, cuatro y cinco alturas requieren un total de 4 400 m³ de CLT, de los que 2 000 m³ tienen calidad industrial vista. La promoción prevé 143 apartamentos, muchos de ellos con jardín o terraza. El proyecto ha obtenido la distinción de ORO del programa klima:aktiv y su concepto energético alternativo incluye el intercambio térmico con un supermercado anejo. También se ha realizado un estudio sobre movilidad con energía eléctrica.

Library at the Dock en Melbourne, Australia

El primer edificio público de CLT, la Library at the Dock, se está construyendo en Melbourne, Australia. Esta biblioteca en el barrio de Victoria Harbour destaca por su excelente valor arquitectónico y cumple todos los criterios exigibles en términos de sostenibilidad. Por todo ello se ha hecho merecedora del codiciado galardón «Five Star Green Rating» del Green Building Council of Australia. La conclusión de las obras está prevista para diciembre del 2013 y la biblioteca abrirá al público a comienzos del 2014. Esta biblioteca forma parte de un amplio proyecto de infraestructuras.