by Web Editor | Aug 6, 2018 | News
The state legislature earlier this year called on the Washington State Building Code Council (WSBCC) to adopt rules for cross-laminated timber (CLT) use when building residential and commercial buildings. The move represents ongoing efforts to bring CLT into mainstream use for residential and commercial construction, which would create commercial value for the small-diameter trees that are contributing to poor forestland health in Washington state.
For state and federal officials, as well as private stakeholders, that change could hasten restoration work by making tree thinning a profitable endeavor rather than a costly project requiring government funding.
The potential CLT offers was articulated by U.S. Forest Service (USFS) Chief Vicki Christiansen at the 2018 Pacific NorthWest Economic Region Summit in Spokane on July 24. “We can use new opportunities for forest product delivery to help us to improve forest conditions, while also creating jobs and sustaining rural communities. We can implement these new practices by working together and being a good neighbor.”
Forest Service Region 6 covers Washington and Oregon and includes 28 percent of all forestland across Washington. In recent years the federal agency has struggled to conduct forest health work due to “fire borrowing” in which those portions of its budget are used to pay for the high cost of firefighting. During last year’s wildfire season USFS spent $2 billion on wildfire fighting, more than half its budget. There were 50 large fires on USFS land and over 411,000 acres burned, costing the agency $130 million. Over 90 percent of those fires were human-caused. In April, federal legislation sought to end the practice of fire-borrowing by allocating additional long-term funding to USFS to the tune of $2 billion starting in 2020.
A 2014 analysis by The Nature Conservancy and USFS concluded that half a million acres of forestland managed by the federal agency in Eastern Washington were in need of thinning and prescribed burns. Along with the new funding, Christiansen said that they can also “align our best practice policies and guidance with the changing markets that are certainly emerging in the Pacific Northwest.”
Read more on this from The Lens at https://thelens.news/2018/07/31/cross-laminated-timber-as-forest-management-strategy/.
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 | Apr 20, 2018 | News
First Full CLT Building In California Opens
The ribbon cutting ceremony by the Plumas County Health and Humans Services Department for its new Biomass Boiler Building in Quincy, CA on April 6, marked the opening of the first building in California made entirely of cross-laminated timber (CLT). CLT is establishing itself as a sustainable building material with a reduced carbon footprint and an inviting, natural aesthetic. Whereas limited uses of CLT were previously implemented across the state of California in buildings as a roof or floor system, the Biomass Boiler Building was constructed using CLT panels for the complete structural system to resist gravity and lateral forces, such as wind or a seismic event.
Owned by Plumas County, the industrial Biomass Boiler Building located adjacent to the Health and Human Services Department in Quincy, CA, includes approximately 2,000 SF of space. It houses an innovative biomass system using organic and sustainable waste material to generate heat for the Health and Human Services Building as an alternative to fossil fuels. The boiler is only the second of its kind in the U.S.; it is a community-scale, biomass boiler unit that runs on hog fuel, a coarse woody material generated as a byproduct directly from forest restoration and management activities.
Camille Swezy, Wood Utilization Program Lead of Sierra Institute, remarked, “The community of Quincy and Plumas County officials are very pleased with the new Biomass Boiler Building constructed entirely of CLT, now housing an innovative biomass heating system. Timber and wood products development is deeply engrained in Quincy’s roots, and the community is now thrilled to have a demonstration of wood utilization in a practical small-scale application.”
Originally, the Biomass Boiler Building structure was planned to be constructed with a prefabricated metal building system. Plumas County officials and the Sierra Institute decided to take the project in another direction to demonstrate the strengths and benefits of building with timber while also incorporating Plumas County’s most abundant natural timber resources. Plumas County officials worked with the design team to integrate mass timber into the building’s design.
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by Web Editor | Mar 26, 2018 | News
From: Panel World Editors
Officials with Oregon State University are investigating a construction incident when a CLT panel failed in mid March at a campus building project. A 4×20 ft. panel, part of the sub flooring between the building’s second and third floors, gave way after delaminating on one end. No construction personnel were in the area and no one was injured. The panel was replaced, other sections of CLT sub flooring were shored up, and work was halted on other CLT sections.
Steve Clark, OSU vice president of marketing and university relations, said the university is bringing in an outside engineering firm to determine cause of the failure and whether any other CLT portions of construction were at risk of failure, and CLT work will resume once any issues are addressed. Ironically, the new Peavy Hall building is home to OSU’s renowned College of Forestry, and the building is designed to showcase Oregon’s forest industry and the relatively new (in North America) mass timber construction movement. However, Clark says project managers “have the utmost confidence in CLT” and plan to finish the project as designed using CLT. The project’s CLT panels are being supplied by D.R. Johnson Lumber of Riddle, Ore., which was the first U.S. producer to gain CLT certification in 2016.
by Web Editor | Nov 8, 2017 | News
WoodWorks, in cooperation with the USDA Forest Service Forest Products Lab and Softwood Lumber Board, conducted a second series of blast tests on three existing two-story, single-bay cross-laminated timber (CLT) structures at Tyndall Air Force Base—the same structures involved in a series of initial blast tests performed in 2016. While a full analysis will be published early next year, on-site observations are decidedly positive. All structures remained intact under significant explosive loading well beyond their design capacity.
“Last year, we tested the structures under their own self-weight,” said Bill Parsons, VP of Operations for WoodWorks. “Those tests were successful and, this year, we built on that effort by testing whether the design methods established as a result of those initial tests needed to be adjusted when the buildings carried typical gravity loads and included different connection configurations, increased panel thickness, and alternate mass timber wall systems.”
Four tests were performed covering a spectrum of blast loads. For tests one and two, the size of the blast load and configuration of the structures were the same as prior testing, except the structures had axially-loaded front panels. The loads applied were intended to simulate conditions associated with a 5-story residential or office building. For tests three and four, different variables were altered on each of the buildings. One building used 5-ply CLT front wall panels, the second used off-the-shelf prefabricated angle brackets, and the third included nail-laminated timber (NLT) front panels. Reflected pressure, peak deflections, and panel acceleration were recorded at front and side faces in order to compare results to previous testing.
As with the tests performed in 2016, peak recorded deflections were consistent with pre-test predictions indicating the effectiveness of design assumptions and methodology in predicting elastic response of CLT to dynamic loads. The second test also indicated a controlled response in which localized panel rupture was observed but connection integrity and load carrying ability were not compromised for any of the loaded structures. Of particular note, all three structures remained standing following the fourth and largest blast, intended to take the structures well beyond their design intent. While panel rupture was expected and observed on all front and side wall panels, the buildings maintained enough residual capacity to remain intact and safe to enter.
From The Construction Specifier: https://www.constructionspecifier.com/woodworks-leads-successful-blast-testing-loaded-mass-timber-structures/
