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 22, 2018 | News
Wood Construction Pushes Forward On Both Sides Of The Border
Mass timber construction is making waves on both sides of the Canada-U.S. border, but factors in each country mean a different pace of progress.
The state of Washington is rapidly moving forward on both green construction and use of advanced wood products, but Washington State Department of Commerce forest products sector lead Brian Hatfield said the state isn’t necessarily ahead of its Canadian neighbor. “In some ways, British Columbia is ahead of us in terms of low carbon building materials,” he said.
In 2017, the Washington State Department of Enterprise Services oversaw a pilot project that built 20 kindergarten through Grade 3 classrooms using cross-laminated timber (CLT) in five school district sites in Washington. “We had a pilot district for five school districts, all single-story schools, and those have gone pretty well. They went up quickly and everyone was impressed,” Hatfield said.
The state’s 2016 supplemental capital budget included $5.5 million for the pilot project, which also measures the efficiencies of using engineered wood products through the construction process.
While Washington is taking steps to increase wood use in construction, the Province of British Columbia has pushed for mass timber and wood-focused design for the previous decade. In 2009, the Province of British Columbia put the Wood First Act into practice, which requires provincially funded projects to use wood as a primary construction material. The B.C. building code was also modified in 2009 to allow for wood buildings of up to six stories.
From Journal Of Commerce: canada.constructconnect.com.
The monthly Panel World Industry Newsletter reaches over 3,000 who represent primary panel production operations.
Panel World is delivered six times per year to North American and international professionals, who represent primary panel production operations. Subscriptions are FREE to qualified individuals.
Complete the online form so we can direct you to the appropriate Sales Representative. Contact us today!
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 | May 4, 2018 | News
The International Code Council’s (ICC) Committee Action Hearings in Columbus, Ohio, have concluded with a clear endorsement of building codes that will enable the use of mass timber technologies in buildings ranging up to 18 stories. Though taller mass timber buildings are currently being built under various local codes, this move by the ICC ensures that model code provisions will be available to many more building officials.
Mass timber structures are generally built with large panels made of cross-laminated timber (CLT), nail-laminated timber (NLT), glue-laminated timber (Glulam) or structural composite lumber (SCL). The greater availability of CLT has provided new options for builders.
“The strength and fire resistance performance of mass timber structures is well understood and supported by substantial testing and data,” said Stephen DiGiovanni, P.E., Chair of the ICC’s Ad Hoc Committee on Tall Wood Buildings and fire protection engineer for the Clark County (NV) Department of Building and Fire Prevention. “As taller mass timber buildings become more widely deployed, it’s important that the International Building Code and the entire family of I-Codes remains at the forefront of emerging construction technologies, and continues to provide building and fire code officials with the tools they need to ensure the safety of the public and first responders.”
All buildings under the International Building Code (IBC) must meet specified fire performance standards, whether built of steel, concrete or mass timber. The 14 code provisions passed out of the ICC Committee Action Hearing established new fire resistance standards and procedures for mass timber that are more rigorous than comparable steel and concrete structures.
From Civil+Structural Engineer: https://csengineermag.com/code-officials-move-update-ibc-tall-mass-timber-buildings/
by Web Editor | Jul 13, 2016 | News
Projects in Springfield and Portland have landed a collected $200,000 as leaders test the viability of cross-laminated timber.
The funding, awarded by the Business Oregon-backed cleantech champions Oregon BEST and the National Center for Advanced Wood Products Manufacturing and Design, will back research that fast-tracks CLT as a green construction material usable throughout the U.S.
Of that money, $155,000 will go to the planned four-story Glenwood Parking Structure in Springfield. The project’s developers will use the money for research, performance testing and code documentation. The team will measure such factors as vibration, moisture, post-tension loss in rocking shear walls and seismic instrumentation. The SRG firm designed the 360-space structure.
The National Center for Advanced Wood Products Manufacturing and Design, a collaboration between Oregon State University and the University of Oregon, will perform the research and testing functions. The Carbon 12 mixed-use condominium complex in Northeast Portland was awarded $45,000 for acoustic and moisture testing.
According to Oregon BEST, U.S. architects and builders wanting to use the new material in construction projects “must negotiate a maze of additional documentation, atypical performance modeling requirements, unfamiliar construction methods and building code hurdles that can delay CLT projects and has slowed adoption of the material.”
From the Portland Business Journal: https://www.bizjournals.com/portland/blog/sbo/2016/07/new-springfield-portland-buildings-get-200k-to.html
