J.R.R. Tolkien, author of TheLord of the Rings, once wrote, “I longed to devise a setting in which the trees might really march to war.”
If climate change is a battle for Earth’s survival, then trees will be a vital army holding the line. When Tolkien imagined trees marching to war, he couldn’t have foreseen how relevant those words would one day be.
The team is brainstorming innovative ways to make the building material of the future—mass timber—more versatile. But in order to do that, they have to find an adhesive and a preservative, two substances that tend to be uncooperative together when used on timber, that will work concurrently for optimal bond strength and durability.
The following is a press release from the U.S Endowment for Forestry and Communities.
The U.S. Endowment for Forestry and Communities (Endowment), in partnership with the United States Department of Agriculture’s Forest Service (USFS), today announced the initiation of the Mass Timber University Grant Program (Grant Program) and related Request for Proposals (RFP) to promote the construction of mass timber buildings on institutions of higher learning campuses across the U.S. The intent of the Grant Program is to inspire interest in and support for mass timber products among the architectural, developer and building communities as well as the public, by showcasing them in highly-visible projects on university campuses.
Wood buildings provide an array of economic and environmental benefits. Interest in capitalizing on those benefits by constructing mid- to high-rise buildings using cross-laminated timber (CLT) is growing. CLT is made from layers of dried lumber boards stacked in alternating direction at 90-degree angles, glued and pressed to form solid panels. These panels have exceptional strength and stability and can be used as walls, roofs, and floors. Additionally, calculations have shown that a seven-inch floor made of CLT has a fire resistance of two hours.
In order for wood structures to rise above six stories without special building official permission, changes to the International Building Code are needed. It’s a tall order, but researchers from the Forest Service’s Forest Products Laboratory (FPL) recently completed a series of fire tests that will address concerns about fire performance of wood buildings and help take them to new heights. Continue reading →
The growing reputation of cross-laminated timber (CLT) as a sustainable, cost-effective, and innovative building material has prompted researchers at the Forest Products Laboratory (FPL) to build upon past research and investigate the material’s ability to fight against fungus.
(A) Intact cross-laminated timber panel section; (B) 4-in. cube cut from panel section for scaled-up decay testing.
Praised for its many benefits, including speed of construction, cost, sustainability, excellent thermal and sound insulation, and fire restriction qualities, the pre-fabricated building material has made a name for itself in the construction and worldwide mass timber market. CLT has already made an appearance in a variety of high-rise apartment buildings in the Pacific Northwest and Southeast United States, urging scientists in the Lab’s Durability and Wood Protection Unit to further examine how the timber fairs against a rainy, humid climate.
The study builds upon past conclusions that untreated CLT is susceptible to mold and a variety of fungi. While decay can be reduced with preservatives such as boron, researchers are using more methods to investigate resistance treatments.
Scientists have implemented soil block assay tests on numerous random samples of CLT, and also plan to conduct mass loss and x-ray density profiling to assess decay in CLT.It is hoped that this exploration will help researchers develop more targeted fungal reduction methods for CLT.