Stora Enso CLTWood: the world’s oldest and yet most modern building material.

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Stora Enso is the global rethinker of the paper, biomaterials, wood product and packaging industry. We always rethink the old and expand to the new to offer our customers inno-vative solutions based on renewable materials.

The company employs around 28,000 people in over 35 countries. Our Building and Living business area is Europe’s largest producer of sawn timber. Approximately 4,400 people are employed in over 20 production units and worldwide distribution networks.

Rethink is our change engine, serving as a promise that we shall always rethink the old and expand to the new in all that we do.

Our Values – Lead and Do what’s right – are the lights for our journey, anywhere we operate. Our values must always be aligned with the local laws and rules, but also take us beyond local practices to bring the people and communi-ties forward.

Our Purpose – Do good for the people and the planet – is why we do all this. Why we set a strategy and then execute it, including but not limited to the financial, market and other metrics. How we want to change the world, the communities and lives of all people who come in contact with us, be it through our products, our operations or our supply chain. Change for better.

Do good for thepeople and the planet.

Stora Enso

Our mills in Ybbs an der Donau and Bad St. LeonhardCLT is produced in our Austrian mills in Ybbs an der Donau and Bad St. Leonhard before being distributed around the globe. The two mills have an annual produc-tion capacity of approx. 120,000 m³ which corresponds to roughly 2,500 detached houses, thus providing a continuous supply to meet current demand.

Our mills in Hartola and PälkäneOur two Finnish mills in Hartola and Pälkäne produce pre-fabricated CLT modules. The modular concept is exceptionally well-suited to buildings with identical accommodation units such as halls of residence or hotel rooms, and can reduce construction times by up to 70%. As the modules are produced in our mills, they are not exposed to the weather which also brings added benefits.

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recycling(re-used as raw material)

forest

solar energy and CO2

oxygen

saw milltimber shavingstimber materials

energy

house constructiontimber materials

heat and power station

Wood is becoming increasingly important. Growing social awareness of resource conservation and new technical developments are bringing mankind’s oldest building material back into the spotlight.

Partnering with the forest.

The starting point is the forest as the main supplier of materials. Through the intensi-fied use of wood, “new forests” are emerg-ing in our towns and villages, providing a substantial store of carbon which eases the burden on the environment. At Stora Enso,

we believe in a sustainable and energy-efficient construc-tion method for the public and private sectors. We always endeavour to use domestic roundwood. The PEFC certifi-cate guarantees that our wood is derived from sustainably managed forests. This means that less wood is taken from the forests than grows back.

Natural cycle: wood can be used again and again.

Wood is an excellent reusable material.Timber products can be recycled again and again.

Durable, sustainable and flexible: CLT — the solid wood construction system.

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Cross Laminated Timber.CLT

CLT is a solid wood construction product consisting of bonded single-layer panels arranged at right angles to each another. It can measure up to 2,95 × 16,00 m. CLT solid wood panels are made up of several layers and are available in different panel thicknesses. The layers are bonded using environmentally-friendly formaldehyde-free adhesives. CLT offers virtually boundless possibilities in terms of construc-tion concept, style and architecture. It is suitable for internal and external walls and for ceilings and roofs.

Universal applicationsCLT is extremely versatile and can be fully combined with other building materials. Thanks to its load distribution prop-erties in two directions, CLT presents no limitations to archi-tectural, residential or utility building projects. For this rea-

son, it is becoming increasingly used for the construction of houses and apartment buildings, as well as for industrial and commercial buildings. As a high-quality structural material with an enormous load-bearing capacity, CLT is becoming increasingly popular for the construction of carports, small structures and wood composite ceilings, and is also being widely used in many other areas.

More room for livingAnother advantage of CLT is its space-saving dimensions. External and internal walls are much thinner than brick walls, for example. On average, this means 6% to 10% more living space* in a house made from CLT.

* based on a house with a living space of 100 m²

Technical specificationsUse wall, ceiling and roof panels

Maximum width 2.95 m (on request up to 4.00 m)

Maximum length 16.00 m

Maximum thickness 400 mm

Panel design 3, 5, 7 or 8 layers

Machining any cut required

Wood species spruce, pine

Wood moisture 12% ± 2%

Visual quality non-visible, industrial visible and visible quality

Surface sanded on both faces

Weight approx. 470 kg/m³ CLT

Water vapour transmission resistance 20–50 µ

Thermal conductivity 0.11 W/(mK)

Specific heat capacity cp 1,600 J/(kgK)

Usage class 1 and 2

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Entirely prefabricated.

For projects with many identical units, such as halls of resi-dence or hotels, we have developed a modular system whereby most of the work — tiles, paint, technical installa-

tions, etc. — is performed at the factory.

Ready-to-fit wall panels.

The pre-cut CLT panels are delivered by truck directly to your construction site, ready for fitting by a construction company. Even the openings for windows, doors and installations are already machined in the factory. Above all, this particularly high level of prefabrication saves time and money.

Visually appealingManufactured by means of sustainable processes, refined with care, worked with superior skill, this wood construc-tion material meets exceptional quality standards. CLT is available in non-visible, industrial visible and visible qual-ity, and each individual panel is supplied with a sanded surface. The individual lamellas are sorted according to criteria specified by Stora Enso.

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CO2 emissions during manufacture (g/kg) stored carbon (g/kg)Source: Puuinfo, Finnish Forest Industries

1,000

500

0

−500

−1,000

−1,500

−2,000

steel frames lightweight concrete blocks

autoclaved aerated concrete

clay brick concrete timber

Smallest carbon footprintcompared to other building materials

Building responsibly.Wood is an eco-friendly building product and a responsible choice in the fight against climate change. During its growth, a tree absorbs carbon dioxide from the atmosphere which it stores for centuries in buildings made with solid wood. At the same time, new trees grow back and absorb more carbon. One cubic metre of wood stores approximately one ton of CO2 and thus plays an active role in reducing the greenhouse effect. The more wood that is used in build-ings, the better. Therefore not only does it make sense to use CLT for walls, ceilings and roofs, it is also an extremely environmentally friendly way to build.

Wood, the material of the future.Wood is widely available everywhere and is a natural and sustainable raw material which grows back faster than it is used up. In Austria, trees produce enough wood every 40 seconds to build a timber house. A timber house which is disassembled after centuries of use does not leave behind worthless rubbish, but rather utilisable wood. Individual ele-ments can be recycled, while scrap wood can be used as a source of energy.

For future generations.Careful production planning ensures that the raw materi-als for producing CLT are used in the most efficient way. With correct planning, construction and protection against adverse weather conditions and damp, CLT buildings can last for centuries.

Actively protecting the environment.In addition, thanks to its heat storage capacity and mass, CLT can efficiently store heat in the winter, and protect buildings from overheating in the summer. This means that passive house standards are easy to implement and less additional insulation material is required.

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Top marks in all areas.

CLT has outstanding characteristics in all areas including in those that you would least expect.

Comfortable and healthy indoor climateSolid wood is able to absorb moisture from the ambient air which it then releases again when the air becomes drier. That is why solid wood provides an excellent indoor climate and is the ideal choice for people who attach importance to a healthy and pleasant atmosphere.

Fire protectionSolid wood is more fire-resistant than is generally assumed. CLT has a moisture content of approximately 12%. Before wood can catch fire, the water it contains must first evapo-rate. In addition, the carbonised surface protects the internal CLT layers so that the solid wood construction does not collapse in a fire. To support this statement, we asked an

accredited institute — the Holzforschung Austria — to test the fire resistance of CLT. The results speak for themselves, demonstrating CLT’s high level of fire resistance. The corre-sponding classification reports can be found on our website.

Excellent structural propertiesDue to their enormous structural load-bearing capacity, CLT panels now also enable new architectural and design dimensions to be created in timber construction. As the single-layer panels are bonded alternately at right angles to each other, the load is transferred along two axes. Even projecting or point-supported structures can be realised in outstanding quality with CLT. The high inherent stiffness of CLT also has a positive impact on bracing a building.

Safe, even in earthquakesThanks to their high static strength and flexibility, buildings constructed with CLT solid wood panels perform superbly in areas of seismic activity. As solid wood is lighter than concrete, the weight of the building is better able to with-stand tremors.

Advantages at a glance.We know that CLT is the construction material for a sustainable future. CLT offers many advantages over conventional construction materials:

• shortset-uptime,easytoassemble and high level of prefabrication

• upto10%morelivingspacegainedbyusingCLT*

• CLTislighterthanconcreteorbrick

• eco-friendlyandsustainableconstructionmethod

• positiveCO2 balance

• comfortableandhealthyindoorclimate

• excellentfiresafetycharacteristics

• goodinsulatingproperties

• excellentstructuralproperties

• dryconstructionmethod

• earthquake-resistantconstructionmethod

• sustainable,certifiedbuildingmaterial

* based on a house with a living space of 100 m²

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CLTlive.CLT offers almost unlimited possibilities from passive houses and nurseries to industrial buildings. For many years we have also been moving towards urban construction, i.e. multi-storey, urban timber structures such as apartments, offices and hotels.

Detached houses

Sistrans (Austria)

CLT was consistently used as a construction material for the interior work, stairs and furnishings of this duplex house. The master carpenter made steps, washstands and shelves from the cutting waste and built them into the building’s structure. Thanks to its high insulation thickness and con-struction method, the building consumes less than 15 kW hours of electricity per square meter per year, thus fulfilling passive house standards and playing an important role in protecting the climate and the environment.

A word from the customer:“Dwindling sources of energy, high energy costs and, above all, the fragile environment are causing us to rethink how to build houses — for the sake of our children.”

Location: Sistrans (Austria)Architect: maaars architecture ZT GmbHPartner: DMH Handels GmbHCLT installed: 175 m³

Public buildings

Egglham primary school (Germany)

The school comprises three u-shaped gable roof build-ings, each with two storeys, which are connected together. Virtually all flat structural components are made from CLT and the building, which was constructed in 2010, features a large amount of visible quality CLT elements. Studies have shown that compared to standard classrooms, tim-ber classrooms give pupils a greater ability to concentrate and help to reduce stress and tension.

A word from the Kremsreiter architects:“Right from the start, the customer wanted a future-oriented building that would consume as little energy as possible. Consequently, the plan was to create a school which sets an example of how to respect the environment.”

Location: Egglham (Germany)Architect: Kremsreiter ArchitektenPartner: Grossmann Bau GmbHCLT installed: 600 m³

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Multi storey buildings

Bridport House (London, United Kingdom)

Set in the London Borough of Hackney, Bridport House which is London’s tallest CLT building with eight storeys, took just 12 weeks to build (starting from October 2010). The building comprises 41 apartments, each with its own garden or balcony.

The light weight of CLT was an important consideration for the project, as a sewer runs beneath the building. Bridport House and with it, the use of CLT to build a multi-storey building in an urban environment, marked a milestone for Stora Enso.

Wood City (Helsinki, Finland)

The first two Wood City residential buildings are located in the Jätkäsaari district of Helsinki. These eight-storey build-ings contain 98 apartments, and construction is anticipated to take just four months. Both buildings will be Finland’s

A word from the London Borough of Hackney:“The use of eco-friendly materials was a fundamental choice in achieving our goals for a sustainable and cost-efficient construction.”

A word from the customer:“Short construction periods and flexible planning were deci-sive factors in choosing CLT, not to mention its sustainability and positive CO2 balance.”

Location: London (United Kingdom)Architect: Karakusevic Carson ArchitectsPartner: Eurban Ltd.CLT installed: 1,576 m³

Location: Helsinki (Finland)Architect: Anttinen Oiva ArchitectsPartner: SRVCLT installed: 2,500 m³

tallest wooden buildings and mark the start of building work on the Wood City district.

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CLT wall elements (C panels)The grain direction of the cover layers is always parallel to the panel widths.

widthlength

C3s

C5s

Nominal thickness

[mm]

Designation[—]

Layers[—]

Lamella structure[mm]

C L C L C L C

60 C3s 3 20 20 2080 C3s 3 30 20 3090 C3s 3 30 30 30

100 C3s 3 30 40 30120 C3s 3 40 40 40100 C5s 5 20 20 20 20 20120 C5s 5 30 20 20 20 30140 C5s 5 40 20 20 20 40160 C5s 5 40 20 40 20 40

CLT ceiling elements (L panels)The grain direction of the cover layers is always at right angles to the panel widths.

widthlength

L3s

L5s

L5s-2*

L7s

L7s-2*

L8s-2**

Nominal thickness

[mm]

Designation[—]

Layers[—]

Lamella structure[mm]

C L C L C L C

60 L3s 3 20 20 2080 L3s 3 30 20 3090 L3s 3 30 30 30100 L3s 3 30 40 30120 L3s 3 40 40 40100 L5s 5 20 20 20 20 20120 L5s 5 30 20 20 20 30140 L5s 5 40 20 20 20 40160 L5s 5 40 20 40 20 40180 L5s 5 40 30 40 30 40200 L5s 5 40 40 40 40 40160 L5s-2* 7 60 40 60180 L7s 7 30 20 30 20 30 20 30200 L7s 7 20 40 20 40 20 40 20240 L7s 7 30 40 30 40 30 40 30220 L7s-2* 7 60 30 40 30 60240 L7s-2* 7 80 20 40 20 80260 L7s-2* 7 80 30 40 30 80280 L7s-2* 7 80 40 40 40 80300 L8s-2** 8 80 30 80 30 80320 L8s-2** 8 80 40 80 40 80

* cover layers consisting of two lengthwise layers** cover layers and inner layer consisting of two lengthwise layers

Width (charged widths): 245 cm, 275 cm, 295 cmLength (production lengths): from minimum production length of 8.00 m per charged width up to max. 16.00 m

(in 10 cm increments)

Product informationCLT standard designs

Industrial and commercial buildings

LignoAlp office building (Bressanone, Italy)

Even from the outside, LignoAlp’s office building has an extremely innovative and impressive appearance, evocative of an over-sized wooden cube. The staircase, elevator shaft and entrance area were made with CLT, demonstrating the flexible functionality of this building material. The fascinating interior design invites visitors on a journey of discovery into the world of wood as a natural building material.

A word from LignoAlp:“A love of wood and the understanding that healthy, energy-efficient living best serves the needs of people are part of our day-to-day business.”

Location: Bressanone (Italy)Architect: Sandy Attia and Arch. Matteo ScagnolPartner: Damiani Holz & Co S.p.a.CLT installed: 90 m³

Stora Enso Building and LivingBuilding SolutionsE-mail: buildingsolutions@storaenso.comwww.storaenso.com/buildingandlivingwww.clt.infofacebook.com/storaensolivingroom P

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