by Web Editor | Jan 13, 2016 | News
The American Wood Council says the International Code Council (ICC) Board of Directors approval of the formation of a Tall Wood Building Ad Hoc Committee.
The committee will be made up of stakeholders, code officials and other interested parties. The committee will study tall wood construction and may develop code changes to be submitted for the 2021 International Building Code. Tall wood is an industry term to identify the use of cross laminated timber (CLT) and other heavy timber manufactured wood products in building heights greater than six stories.
“Other nations have already seen the benefits of tall wood construction – from the low carbon footprint, ease of construction and reduced construction time.
“Wood products are made from renewable resources found abundantly in North America. AWC petitioned ICC for creation of the committee to research the building science of tall wood buildings, and are pleased that it is moving forward. This is an important step toward the advancement of tall wood in the United States, a carbon-sequestering alternative in construction.”
From Woodworking Network: https://www.woodworkingnetwork.com/news/woodworking-industry-news/tall-wood-building-committee-will-work-2021-global-building-codes
by Web Editor | Nov 30, 2015 | News
We get so excited about Cross-Laminated Timber (CLT), the fancy plywood on steroids that we talk so much about on TreeHugger. But in fact, there is a much older technology for building with wood, that warehouses and factories were built out of 150 years ago with a fancy new name: Nail-Laminated Timber, or NLT. It used to be known as heavy timber or mill decking and is drop-dead simple: you just nail a pile of lumber together and voila.
Lucas Epp of Structurecraft stunned the audience in a presentation at the Wood Solutions Fair in Toronto, showing extraordinary projects built out of the stuff. Because while CLT is great stuff, it’s pretty new in North America, it’s expensive, and it’s not fully understood by the building inspectors. Whereas if you are doing a simple span, NLT does the job just fine, it’s a lot cheaper, can be made by anyone with a hammer and has been in the building codes forever.
It’s now being used in a 210,000 square foot, seven story office building in Minneapolis, where the developer, Hines, wanted “the warmth of wood and the embrace of green construction techniques and materials” to attract the tech and creative sector of the market. It also goes together much faster than a conventional steel or concrete building.
Heavy timber office and warehouse construction fell out of favor early in the 20th century after major fires in a number of cities caused the switch to concrete and steel noncombustible construction. The development of effective sprinklers has reduced that risk, and concerns about the carbon footprint of concrete have made renewable wood look a lot more attractive.
From TreeHugger.com: https://www.treehugger.com/green-architecture/old-new-again-nail-laminated-timber.html?utm_source=WIT112715&utm_medium=Email&utm_campaign=WeekInTrees
by Web Editor | Nov 20, 2015 | News
Portland is growing up—adding high-rises, increasing density, and pricing many people out. But two local firms are exploring a state-of-the-art building material that could help solve the city’s affordability problem, create living-wage jobs in rural communities, and help save the planet. It’s wood.
Right now, Portland-based LEVER Architecture and real estate development firm Project^ are designing a 12-story mixed-use wood building in the Pearl District that will be made primarily of a material called cross-laminated timber (CLT).
That’s an unheard of height for wood structures, which top out at six stories in most of the US. And it’s not the project’s only unique attribute. Five of those stories will be affordable housing, something Portland desperately needs.
LEVER and Project^ have partnered with Beneficial State Bank (which owns the property at 430 NW 10th), Albina Community Bank, and the housing agency Home Forward on the development, which they’re calling Framework.
The team’s ideas received national attention: In September, the US Department of Agriculture awarded the project a $1.5 million grant—money that will help alleviate the cost of proving to state and local building authorities that tall wooden buildings can meet safety requirements for earthquakes, fires, and other perils.
From The Portland Mercury: https://www.portlandmercury.com/portland/the-worlds-most-sustainable-high-rise-construction-material-is-wood/Content?utm_source=WIT112015&utm_medium=Email&utm_campaign=WeekInTrees&oid=16991973
by Web Editor | Oct 19, 2015 | News
CLT Creates New Opportunities For Hardwoods
The latest UNECE Forest Products Annual Market Review highlights the rapid growth in the market for cross laminated timber (CLT) and the new opportunities the product creates for wood, including hardwood, to compete in high-end structural applications. Although the first CLT production facilities were constructed in the DACH countries (Germany, Austria and Switzerland) in 1994, the full potential is only now being realized following a long period of technical and market development.
CLT first entered the building market during the 2005 to 2010 period, transforming from a small-scale niche product into large-scale industrial production. CLT panels consist of several layers of structural lumber boards stacked crosswise (typically at 90 degrees) and glued together on their wide faces and, sometimes, on the narrow faces as well. In special configurations, consecutive layers may be placed in the same direction to obtain specific structural characteristics. CLT products are usually fabricated with three to seven layers, but with additional layers in some cases.
Thickness of individual lumber pieces typically varies from 16 mm to 51 mm and width varies from 60 mm to 240 mm. Boards are finger-jointed using structural adhesive. Lumber is visually-graded or machine stress rated and is kiln dried. Panel sizes vary by manufacturer; typical widths are 0.6m, 1.2m, and3 m, while length can be up to 18m and thickness up to 508 mm.
The dimensions and lay-up of CLT production are now internationally standardized and recognized, and production techniques are optimized in modern manufacturing facilities. CLT is designed to maximize yield, utilize lower grades of lumber, and it can be made in a high volume of very large sections.
The result is a light but very strong panel product that can be made off-site and erected quickly to form structural walls, floors and ceilings. CLT is used in a wide range of applications in single-family houses, multi-story towers, public buildings and specialty construction.
From FORDAQ: fordaq.com.
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by Web Editor | Oct 16, 2015 | News
Cross-Laminated Timber (CLT) is one of our favorite 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? In most of the CLT projects so far its use has been downplayed, thanks to the effectiveness of the concrete and steel people who try and convince people that it is not as good as concrete. That’s why this new project in Montreal is so interesting: It accentuates the positive, the virtues of wood construction. Even its name, Arbora, alludes to wood.
It’s also big. The Arbora project in Montreal is claimed to be the largest residential CLT project in the world, made up of 434 condo, townhouse and rental units in three eight story buildings, all made from sustainably harvested wood turned into panels by Nordic CLT. It’s designed by Lemay+CHA.
But what I really like is the fact that they are really building on the strengths of wood instead of trying to hide it. The developers, in their marketing, discuss the renewable aspects of wood construction, the strength and weight advantages, the thermal and fire resistance, the accuracy.
Prefabricated panels cut to the required dimensions are delivered to the site, and the openings for doors and windows are cut to an accuracy of one tenth of a millimeter using computer numerical control (CNC) precision machinery. Everything is planned and organized so the building can be erected quickly.
From TreeHugger.com: https://www.treehugger.com/green-architecture/worlds-largest-cross-laminated-timber-apartment-complex-being-built-montreal.html?utm_source=WIT101615&utm_medium=Email&utm_campaign=WeekInTrees
