by Web Editor | Jun 7, 2017 | News
Officials in Oregon have approved construction permits for the first all-wood high-rise building in the nation. Construction on the 12-story building, called Framework, will break ground this fall in Portland’s trendy and rapidly growing Pearl District and is expected to be completed by the following winter.
The decision by state and local authorities to allow construction comes after months of painstaking testing of the emerging technologies that will be used to build it, including a product called cross-laminated timber, or CLT.
To make CLT, lumber manufacturers align 2-by-4 boards in perpendicular layers and then glue them together like a giant sandwich before sliding the resulting panels into a massive press for drying. The resulting panels are stronger than traditional wood because of the cross-hatched layers; CLT can withstand horizontal and vertical pressures similar to those from a significant earthquake with minimal damage. They also are lighter and easier to work with than regular timber, resulting in lower cost and less waste.
For this project, scientists at Portland State University and Oregon State University subjected large panels of CLT to hundreds of thousands of pounds of pressure and experimented with different methods for joining them together. The project materials also underwent extensive fire safety testing and met fire codes.
State officials hope the building will stir greater interest in high-rise construction using mass timber and help revitalize the state’s lagging logging industry. Logging, once a major source of revenue in Oregon, has dropped sharply in the past few decades because of greater environmental protections for salmon and the spotted owl. The loss of the industry has devastated some of the state’s rural communities.
From The Register-Guard: https://registerguard.com/rg/news/local/35651365-75/portland-approves-permit-for-nations-first-all-wood-high-rise.html.csp
by Web Editor | Jan 4, 2017 | News
When the 12-story Framework building planned at Portland’s Northwest 10th Avenue and Glisan Street is complete, it may look to passers-by like any other Pearl District condo tower.
But it will hold a special distinction in the sustainable building world: the nation’s tallest building made primarily from mass timber (long pieces of timber, glue-laminated together).
Designers and engineers across the country are chasing an innovative style of mass timber construction pioneered in Europe, which they believe will go a long way to reduce the carbon footprint of large buildings.
The breakthrough came with the development of cross-laminated timber or CLT: Large, layered flat panels used as floors and walls (rather than just beams as vertical posts).
As Oregon moves on multiple fronts to take the national lead in all-wood construction for tall buildings, Portland State University stepped up early to do basic research. PSU won a three-year, $400,000 National Science Foundation grant to study two aspects of mass timber construction: its sustainability and how well it resists earthquakes.
From Sustainable Life: https://pamplinmedia.com/sl/337694-214716-psu-tests-new-green-woods-seismic-strength
by Web Editor | Mar 7, 2016 | News
DR Johnson Lumber Co., based in the small Oregon town of Riddle, is poised at the forefront of what could be a revolutionary use of wood as a building material in the Northwest.
Don R. Johnson founded the mill in 1951. Following his death in 2010, his daughters Valerie Johnson and Jodi Westbrooks decided they needed to move the millworks company in a new direction. Their father had been quick to jump on laminated beam products early on and the millworks had manufactured them for decades. Following the lead of their father’s eye for innovation, Valerie and Jodi decided to expand the mill’s manufacturing through a division called Riddle Laminators to include a new product they had heard about.
They have since invested millions of dollars in machinery that is allowing DR Johnson to become the first manufacturer in the country certified to produce cross-laminated timber panels – a new take on existing technology and products in the wood construction industry. What makes their product so progressive is the use of new-growth softwoods like Douglas fir to produce lighter, stronger, more flexible panels in sizes able to make the construction process much more efficient. They also offer a replacement to typical steel or concrete framing.
“We’re limited to 10-foot-by-32-foot panels because of transportation issues, but we can go larger if we need to,” said Todd Black, DR Johnson sales manager. “We have computer-controlled router systems that can pre-cut door and window openings, so the panels come prefabricated, labeled (for point of installation) and ready for immediate installation. Because they’re stronger and lighter than steel or concrete, we’re not limited to three or four stories as wood-frame construction would be.”
CLT is starting to capture attention in Portland. A 12-story structure under construction in the Pearl District will be the tallest all-wood building in the U.S. The technology has already been used successfully in Europe, where buildings up to 22 stories have been constructed with the same type of panels.
From DJC Oregon: https://djcoregon.com/news/2016/03/03/newsmakers-2016-dr-johnson-lumber-company/
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
