Tall timber stacks up in commercial terms
Last week, well-known property investor Sir Bob Jones announced his company’s plan to build a tall timber building in
Wellington. Jones has done his homework on the advantages of wood for large commercial buildings. Australian and
Canadian developers and building companies are well ahead of their New Zealand counterparts in using engineered wood to
commercial advantage.
In a recent announcement for another large building – a multi-family residential building, in at the University of BC,
in Vancouver Canada (see http://adera.com), the development company set out to clarify why they chose wood for this large project. They said new engineered wood
components like cross-laminated timber (CLT) meet or exceed the structural properties of concrete. Wood components are
seismically superior as they don’t crack or shatter like concrete.
Mass timber components are resistant to fire because the material self-chars, meaning oxygen can’t get at it. It’s more
sustainably produced, requires less energy to recycle, and since the panels are pre-assembled offsite, there’s virtually
no on-site waste.
Quick construction is a highlight of CLT. Cross-laminated timber panels weigh much less than concrete equivalents and
are easily transported to their site for craning quickly into position. Only two construction workers are needed to
guide panels into place onto the building frame. A typical floor for a multi-residential mid-rise building consists of
160 to 200 CLT panels. They are lifted at a rate of one every 12 minutes. The onsite crews erecting CLT panels can work
at high rates - installing 400 m2 of floor space in less than three hours.
Brock Commons, currently the world's tallest CLT building at 18 stories, was erected in nine weeks, at an average rate
of two floors per week. A national conference in Rotorua next month features as its keynote speaker the project manager
from that building – Karla Fraser from Urban One Builders in Vancouver.
The on-site assembly of engineered wood structures is also virtually silent — a definite bonus for the neighbours say
experienced managers like Karla Fraser. CLT construction is predicted to continue to make inroads as a viable,
environmentally superior alternative to traditional “stick-on-stick” construction or concrete and steel design in the
multi-family and high-rise market.
“One of the primary benefits of engineered wood structures is the way they influence design and scheduling. Unlike
conventional construction, where you build the shear walls and then frame with plywood, CLT panels are tilted up and
connect directly to the columns — a accurate method that’s simple, fast and very precise.”
As the market becomes more educated about the benefits of this product, demand will only continue to increase. There are
so many benefits to using these materials for construction. It offers superior acoustic, fiber, seismic and thermal
performance, not to mention a reduced carbon footprint."
The upcoming national building industry conference, entitled “Changing Perceptions of Engineered Timber in Construction”
runs on 28 September in Rotorua. It's the second annual conference for Innovatek in commercial wood building. The
diverse programme attracts building owners, developers, architects, engineers, specifiers and key engineered wood
suppliers. The conference theme is “Advantages of Timber in Mid Rise Construction”. For more details see: www.cpetc2017.com
The conference is set to be part of a wood technology week of events coming to the city in September, including the
Forest Industry Engineering Association’s (FIEA) WoodTECH 2017 two-day conference and trade expo. Rotorua Lakes Council
are event partners promoting their successful “Wood-First” policy.
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