Cross Laminated Timber CLT

1. FUTURE
TECHNOLOGY
CROSS
LAMINATED
TIMBER
CEN4015
Reinforced Concrete

2. AGENDA
Introduction​
history Cross laminated timber
​Manufacture
ecologically
Examples
​Summary​

3. INTRODUCTION
The article quotes British architect Andrew Waugh with the words
"This is the beginning of the timber age." Waugh has recognised the
advantages of timber construction and goes on to say: "that building in
wood is super fast, super accurate, and also makes the most amazingly
beautiful spaces", and "These are buildings that feel very good to be
in, very robust and very solid."
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4. HISTORY
OF Cross laminated timber

5. CROSS LAMINATED TIMBER WAS FIRST MENTIONED IN SPECIALIST
LITERATURE ALMOST 30 YEARS AGO.
IN 1998, THIS NEW TYPE OF PRODUCT WAS GRANTED ITS FIRST
NATIONAL TECHNICAL APPROVALS IN THE GERMAN-SPEAKING
COUNTRIES OF EUROPE.
SIMILAR PRODUCTS WERE ALREADY KNOWN TO THE MARKET UNDER
NAMES SUCH AS BLOCKBOARD, PLYWOOD AND LAMINATED VENEER
LUMBER (LVL), BUT THE HUGE INNOVATION HERE WAS THE SIZES IN
WHICH CROSS LAMINATED TIMBER (CLT) COULD BE MANUFACTURED.
ONE OF THE POSSIBLE BENEFITS ARISING FROM THIS IS ITS USE AS A
LOADBEARING ELEMENT IN STRUCTURES THEREBY OPENING UP NEW
PERSPECTIVES AND POSSIBLE APPLICATIONS TO THE WHOLE INDUSTRY.
OVER THE YEARS, THE USE OF SOLID TIMBER COMPONENTS HAS
BECOME VERY POPULAR AND REPRESENTS AN IMPORTANT ADDITION
TO THE TECHNIQUES OF TRADITIONAL TIMBER CONSTRUCTION.
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6. MANUFACTURE
OF Cross laminated timber

7. 7
• Cross laminated timber normally
consists of 3 to 7 layers of
softwood boards bonded together
crosswise. The individual boards
are connected to one another
longitudinally by finger joints and
the layers are glued together. The
product is offered in various
qualities and grades.
• Depending on the method of
production, the first step is usually
to produce single-layer panels by
gluing the individual boards
together along their narrow edges.
These layers of boards are then
stacked to form multiple layer
panels. The process is highly
automated and can provide ready-
to-use CLT elements with lengths
up to 16 m and widths up to 3.5 m.

8. ECOLOGICALLY

9. One of the most important ecological advantages of the processing of wood
into CLT is that a wide range of quality of tree trunks can be used, in turn
fostering a sustainable forestry industry. By harvesting mature trees and then
replacing them with saplings, it can be argued that sustainable forestry actually
reverses CO2 emissions.
Healthy, growing trees have a negative CO2 balance. To maintain a negative
carbon balance, old or mature trees have to be harvested and new trees must
be planted. The use of trees of differing quality for manufacturing wood
products locks CO2 into the wood. In short, using wood creates a positive effect
for the environment which is called a carbon sink.
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10. EXAMPLE
OF Cross laminated timber building

11. MURRAY GROVE
IN LONDON
Their first pilot project was Murray Grove (see above), a
nine-storey, 30-metre-tall, timber building in Hackney,
London. Made entirely out of wood – from the structure,
walls and floors to the lift cores and staircases. It was
completed in 2008, and at the time was the tallest timber
structure in the world. Currently, the company is at working
on a ten-storey, 123-unit timber structure in London.
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12. HOHO
IN VIENNA
Last but not least, HoHo Vienna will be built according to the
criteria of the new TQB assessment system (total quality
building) developed by the Austrian Sustainable Building
Council (ÖGNB). The energy concept will include measures for
the prevention of energy loss such as lifts equipped with
energy recovery technology, photovoltaic systems, air/water
collectors for the pool, fundament absorbers as well as a
decentralised ventilation system with air- conditioning.
Other key projects that are leading the way with wood
promotion include Zumtobel’s LifeCycle Tower ONE in
Dornbirn, Austria (see above), which claims to be the world’s
first unencapsulated timber hybrid high-rise building and to
set new standards in respect of sustainability, efficient use of
resources and quality of life.
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13. SUMMARY
Presentation title 13
Wood as the Material of the Future
• Sustainable
• Quick to build
• Efficient
• Climate-positive
* CLT's cost for materials and labor may be lower than traditional steel or
concrete. Though variable, material cost savings may be as much as 15%
compared to concrete, steel, and masonry for mid-rise residential
buildings. Why? CLT is lighter, so requires a smaller foundation.
* CLT really is a dream material. It is one of our favourite materials; it's
made from a renewable resource, it sequesters carbon dioxide, it's lighter
than concrete and it's lovely to look at. What's not to love?

14. THANK YOU
Zouhir Bichry
31801448
zouhirbichry@gmail.com