by Web Editor | Oct 31, 2018 | News
Prescriptive requirements for wood structures up to 18 stories were among the additions preliminarily approved for the International Building Code following the work of the International Code Council’s ad-hoc Tall Wood Buildings Committee.
Wood is widely recognized as a carbon-neutral building material, but its use as a structural material has been mostly limited to residential and low-rise buildings due to its combustible nature. Through recent advances in manufacturing and engineering, wood in the form of mass timber products is increasingly attracting interest as a structural system for tall buildings.
Portland, Ore., recently saw the completion of the eight-story Carbon12, currently the tallest wood building in the United States. Still, progress has been slow in this country as compared to Europe or Canada, where the 18-story-tall Brock Commons, in Vancouver, stands as the tallest timber structure in the world. One significant issue inhibiting widespread adoption in the U.S. is prescriptive building codes, which currently limit the height of wood buildings to 85 feet, or six stories. In December 2015, the International Code Council (ICC) formed an ad-hoc committee to study the impact of tall wood buildings on the building code with the membership voting on the adoption of proposed changes on Oct. 24.
The ICC’s International Building Code (IBC) classifies a high-rise building as any building with an occupied floor 75 feet above the lowest level at which fire department vehicles can access. The 2018 IBC defines heavy timber structural members as Type IV construction, which also includes a range of wood products, such as solid sawn timber, glue-laminated members, and composite wood members. The term mass timber, however, comprises both heavy timber as well as engineered products, many of which the IBC does not reference, such as cross-laminated timber (CLT).
Heavy timber construction is currently limited to a height of 85 feet. Architects can design taller wood structures, but they must demonstrate that the design meets the prescribed code and performs as well or better than a similar concrete or steel structure. This can be a costly and time-consuming process, requiring extensive testing and documentation on the part of the design team and building owner.
Read more on this from Architect Magazine at https://www.architectmagazine.com/technology/support-for-tall-timber-reaches-new-heights-in-the-building-code_o.
by Web Editor | Aug 17, 2018 | News
Thanks to a recent addendum to Oregon’s building code, the state is the first in the country to allow timber buildings to rise higher than six stories without special consideration.
Portland has become something of a hotbed for timber innovation as of late. Carbon12, PATH Architecture’s eight-story glulam and cross-laminated timber (CLT) tower with a steel core, recently became the country’s tallest timber building and was set to be surpassed by LEVER Architecture’s 12-story Framework. Alas, that project was put on hold due to mounting financial difficulties last month, but it seems the precedent that the project achieved in securing a building permit from the State of Oregon and City of Portland will live on.
The timber allowance comes courtesy of Oregon’s statewide alternate method (SAM), a state-specific program that allows for alternate building techniques to be used after an advisory council has approved the “technical and scientific facts of the proposed alternate method.” The allowance comes after the International Code Council (ICC)–the nonprofit group that Oregon models its building codes after–established the ICC Ad Hoc Committee on Tall Wood Buildings in 2015 to explore the benefits and challenges of using timber in tall buildings.
A Committee Action Hearing was held in April of this year, where the Ad Hoc Committee, made up of code experts, stakeholders, and industry members presented their findings. All 14 of the committee’s suggestions were adopted, introducing standards and best practices for fireproofing, the load-bearing potential of CLT and heavy timber, water resistance, sealing, seismic ratings, and more.
Three new building classifications were introduced as a result: Type IV A, timber buildings permitted up to 18 stories and 270 feet tall, Type IV B, timber buildings with a maximum height of 12 stories and 180 feet, and Type IV C, which is permitted to rise nine stories and 85 feet tall at maximum. The shortest of the timber typologies is allowed to use exposed structural timber as an interior finish, whereas the tallest, type A, must enclose all exposed surfaces and include a three-hour fire-resistance rating for the structural elements.
Read more on this from The Architects Newspaper at https://archpaper.com/2018/08/oregon-legalize-mass-timber-high-rises/.
by Web Editor | Aug 8, 2018 | News
A burgeoning industry based on a relatively new type of material may be coming to Minnesota. Known as mass timber, the material is an alternative to steel in building construction. While dozens of buildings constructed with the product are dotted around the country, the majority stand in the Pacific Northwest.
“This type of building product is new to the U.S.,” said Brian Brashaw, a program manager with the U.S. Forest Service. “It’s geared at taller buildings; it’s building more along the lines of four, five and six stories. That product is seeing a lot of growth in the United States.”
Now, local groups and governmental agencies are working on a plan to bring that industry to the Midwest. But before a production facility can set up shop in Minnesota, officials need to know if the right kind of raw materials can be produced in the region.
“This is a feasibility study where we’re taking a closer look at if the Midwest has the lumber production capacity and softwood lumber supply chain in place,” wrote Kristen Bergstrand, of the Minnesota Department of Natural Resources, in an email.
A survey is being sent to 11 sawmills in the region that will help gauge if the state can sustain a mass timber industry. APEX, the local business and economic development organization which is sending out the survey, wants to learn the grade and board footage that mills have produced for trees such as red pine, jack pine, spruce and balsam — all considered viable materials for mass timber.
Read more on this from the Duluth News Tribune at https://duluthnewstribune.com/business/manufacturing/4482202-minnesota-looking-attract-mass-timber-producers.
by Web Editor | Jul 16, 2018 | News
OSU Gets Grant For Cross-Laminated Timber Research
Oregon Senators Jeff Merkley, the top Democrat on the Senate Appropriations Agriculture subcommittee, and Ron Wyden announced Thursday that a nearly half-million dollar U.S. Department of Agriculture grant was awarded to Oregon State University for research on the durability of cross-laminated timber, an innovative product that is helping to advance wood as a construction material for tall buildings.
“We have been working to establish Oregon as a hub for mass timber products, using local timber and bolstering our forest products economy,” said Merkley, who each year on the Appropriations Committee has fought to fund this important grants program.
“This research at OSU supports the innovative manufacturing that helps to create jobs in the rural part of the state, and lays the groundwork for tall wood building construction in urban parts of the state. I will continue to use my seat on the appropriations committee to get this important research and development funded.”
“Oregon is leading the way in developing state-of-the-art timber products that are revolutionizing our nation’s construction industry,” Wyden said. “This funding supports the ongoing research and innovative work Oregon State University is doing to ensure timber products can continue to spark economic growth and create good-paying jobs across Oregon.”
“Oregon State University is at the forefront of research to inform engineering design guidelines for cross-laminated timber structural systems,” said Anthony S. Davis, Acting Dean of the Oregon State University College of Forestry. “This grant award is another example of the excellent research done by scientists affiliated with OSU and the TallWood Design Institute.
Read more on this from KTVZ 21 News at ktvz.com
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by Web Editor | Sep 22, 2017 | News
The production of cross-laminated timber, or CLT, has the potential to create significant job growth in the Pacific Northwest, according to a study published in July 2017 by Oregon BEST, a Portland-based nonprofit.
CLT is made of layers of glued 2-inch-thick dimensional wood crossing over each other at a 90-degree angle, creating a strong panel that can be used in tall buildings.
The 110-page study, “Advanced Wood Product Manufacturing Study for Cross-Laminated Timber Acceleration in Oregon and SW Washington,” was funded by $120,000 from the U.S. Economic Development Administration. The study included wood products companies from across the region, including D.R. Johnson in Riddle, the first structurally certified CLT producer in the U.S.
Valerie Johnson, president of D.R. Johnson, said she agrees with the study that cross-laminated timber will increase employment for rural areas in Oregon like Douglas County. D.R. Johnson started its first glue-laminated timber, or glulam, plant in 1967 in Riddle, and began producing cross-laminated timber in fall 2015.
“The community is part of the fabric of this company. It’s not only where our employees live it’s where our families have grown up and continue to live, and making this a successful venture is really important to us,” Johnson said. “We’re giving it all we can because we really want it to be successful.”
From Treesource: https://treesource.org/news/goods-and-services/cross-laminated-timber-jobs/
