First U.S. Hardwood CLT Project In Development

by | Aug 4, 2017 | News

If Yugon Kim realizes his dream, the new office building or housing complex going up in your city may be made out of large hardwood panels called cross laminated timber (CLT). The technology behind CLT has been used for decades in Europe, and it is just beginning to take root in the United States with softwood CLT leading the way. Kim’s Boston-based, architectural design firm IKD just won a $250,000 grant from the Forest Service for designing, developing and constructing the first hardwood CLT demonstration project in the United States.

The aim is to take low-value hardwoods and turn them into a high-value CLT construction project as a proof of concept. Kim explained, “Over 50% of every hardwood log in the region goes to low-value materials like pallets and cants. Our idea is to utilize this material and to upcycle it.”

Kim along with his design partner Tomomi Itakura have created an outdoor CLT construction project that is titled the Conversation Plinth and will be integrated as circular discs that provide a platform for viewing a sculpture at the Cleo Rogers Memorial Library.

Kim suggested, “The ultimate goal is to construct buildings in the United States using hardwood CLT. Our research hopes to lead toward hardwood mass timbers being used for U.S construction projects.”

The Conversation Plinth was designed for Exhibit Columbus, the annual celebration of architecture, art, design and community in Columbus, Indiana. IKD’s design was selected to win an inaugural J. Irwin and Xenia S. Miller Prize as part of a national competition.

From Pallet Enterprise: https://palletenterprise.com/view_article/4927/Hardwood-CLT

CLT Creates New Opportunities For Hardwoods

by | Oct 19, 2015 | News

CLT Creates New Opportunities For Hardwoods

The latest UNECE Forest Products Annual Market Review highlights the rapid growth in the market for cross laminated timber (CLT) and the new opportunities the product creates for wood, including hardwood, to compete in high-end structural applications. Although the first CLT production facilities were constructed in the DACH countries (Germany, Austria and Switzerland) in 1994, the full potential is only now being realized following a long period of technical and market development.

CLT first entered the building market during the 2005 to 2010 period, transforming from a small-scale niche product into large-scale industrial production. CLT panels consist of several layers of structural lumber boards stacked crosswise (typically at 90 degrees) and glued together on their wide faces and, sometimes, on the narrow faces as well. In special configurations, consecutive layers may be placed in the same direction to obtain specific structural characteristics. CLT products are usually fabricated with three to seven layers, but with additional layers in some cases.

Thickness of individual lumber pieces typically varies from 16 mm to 51 mm and width varies from 60 mm to 240 mm. Boards are finger-jointed using structural adhesive. Lumber is visually-graded or machine stress rated and is kiln dried. Panel sizes vary by manufacturer; typical widths are 0.6m, 1.2m, and3 m, while length can be up to 18m and thickness up to 508 mm.

The dimensions and lay-up of CLT production are now internationally standardized and recognized, and production techniques are optimized in modern manufacturing facilities. CLT is designed to maximize yield, utilize lower grades of lumber, and it can be made in a high volume of very large sections.

The result is a light but very strong panel product that can be made off-site and erected quickly to form structural walls, floors and ceilings. CLT is used in a wide range of applications in single-family houses, multi-story towers, public buildings and specialty construction.

From FORDAQ: fordaq.com.

 

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