How is Cross-laminated Timber Manufactured? Cross-Laminated Timber is created by stacking lumber in alternating directions, and being pressed together with strong adhesives to form a strong panel. These panels can be formed into 3-ply, 5-ply, or 7-ply, depending on the project's needs. The details of cross-laminated timber manufacturing vary from manufacturer to manufacturer but generally follow the process below. Lumber is selected for use within the CLT panel. The lumber is visually or mechanically graded and moisture content is checked. Moisture content must be 12% +/- 3% Group lumber by grade Plane lumber to appropriate thickness Finger-joint and cut individual
As the First Certified Manufacturer of Cross-Laminated Timber in the United States, we are very proud to be apart of the Mass Timber Movement! Cross-Laminated Timber was first developed in Australia in the early 1900's, designed to create a more sustainable form of construction for residential construction. DR Johnson started producing Cross-Laminated Timber in 2015, and now, CLT is the most familiar and widely-used Mass Timber product in the U.S. In order for a construction project to be classified as a "Mass Timber Project," the load-bearing structure would be constructed with the use of Mass Timber. Most applications that use Cross-Laminated Timber are office buildings, hotels, multi-use buildings, public &
District Office is a large mass timber project designed by Hacker Architects, to create a fresh & flexible retail, office, and restaurant space in downtown Portland. The 90,000 sf, six-story building, is known for it's exposed mass timber that consists of DR Johnson cross-laminated timber (CLT) and glu-laminated beams/columns. The CLT panels throughout the structure consisted of 3-ply panels, and the glulam spans ranged form 30 to 40 feet. One of the main objectives architecturally, was to fully expose the wood structure. This required strategical design thinking to ensure that the building's design was aesthetically thoughtful, as well as structurally sound. As the demand for mass timber grows and expands
How Strong is Cross Laminated Timber? DR Johnson Wood Innovations is committed to providing safe structural mass timber products for projects of all sizes. Cross-Laminated Timber is a large-scale, prefabricated, solid engineered wood panel that is lightweight, yet very strong, with superior acoustic, fire, seismic, and thermal performance. Product testing has been done to ensure that all panels are safe and structurally sound for any project. DRJ Wood Innovations was invited to collaborate on a Bi-National Wood Industry Advisory Committee on a research proposal titled: Development & Validation of a Resilience-Based Seismic Design Methodology for Tall Wood Buildings. DRJ panels were used as the structural elements for the
DR Johnson Wood Innovations was the first to become a certified manufacture of cross-laminated timber in the United States. In 2014, DRJ initially got involved with CLT after Oregon State University officials reached out in regards to Europe's use of cross-laminated timber. DRJ was a top candidate for OSU's project because of the years experience of producing of glu-laminated beams. Check out the article, to learn more about DR Johnson's history and how they became the forefront of the CLT movement. Click here to read more.
According to world-architects.com, one of our very own projects, Sideyard, was selected as the U.S. Building of the Week! This beautiful cross-laminated timber building is located in the heart of downtown Portland, Oregon. DR Johnson CLT and glu-laminated beams served as the building's main structure components, with the ground floor serving as store fronts, and the above floors serving as work spaces. Sideyard was designed to fit in a small 9,000 sf urban remnant property, as a working class building. For more on this article, click here.
This article, done by CNN, talks about many of the benefits of the incredible product, cross-laminated timber (CLT). When comparing CLT’s to their competitors (steel and concrete), not only are they stronger, faster to put up, and even safer in the event of a fire, they also have the ability to sequester a large amount of CO2 emissions. The article explains that construction makes up about 40% of the world’s energy consumption and about a third of the green-house gas emissions. The production and use of concrete emits a large amount of carbon while trees will absorb it. Once a tree dies, the carbon that it has absorbed then gets
The Oregon Conservation Center, located in Portland, has added a one story volume to their three story building that was done in the 1970’s. This one story addition featured DR Johnson’s cross-laminated timber and was one of the very first built in the US with CLT’s. The addition will provide the Conservation Center with 15,000 sq ft, giving them more space to host meetings, events, and conferences. This article done by De Zeen, highlights all of the unique factors of this incredible building. Find out more by clicking the link below: De Zeen - Oregon Conservation Center