D.R. Johnson Ready To Serve New Wood Building Market

If the vast potential of timber construction isn’t obvious, a new exhibit at Washington D.C.’s National Building Museum aims to clear things up. Running through May 2017, the USDA-sponsored Timber City is drawing attention to the recent boom in a worldwide movement toward timber construction.

It’s opening up a new market that has been turning the mills at a growing number of wood products companies, including Montreal’s Nordic Structures, Sauter Timber in Rockwood, Tennessee, and D.R. Johnson.

Oregon-based D.R. Johnson Wood Innovations, a subsidiary of D.R. Johnson, specializes in the manufacture of cross-laminated timber (CLT) and glue-laminated beams from Douglas fir and Alaskan yellow cedar. They’re the first U.S. company to receive APA/ANSI certification to manufacture structural CLT panels – and they hope to help grow the U.S. market.

D.R. Johnson is one of only three North American companies certified by the Engineered Wood Association to construct CLT for use in buildings. The company employs 125 at a traditional sawmill and laminating plant, which was recently expanded by 13,000 square feet for increased CLT production. They’re currently fielding calls from hopeful builders, and manufacturing samples to be tested for fire safety and structural quality.

D.R. Johnson says the system for constructing CLT involves assembling prefabricated parts, speeding construction, and paring labor costs. The company partnered with wood processor manufacturer USNR to build a custom panel press for CLT.

From Woodworking Network: https://www.woodworkingnetwork.com/events-contests/event-coverage/timber-construction-exhibition-shines-light-industry

CLT Creates New Opportunities For Hardwoods

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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