by Web Editor | Oct 31, 2018 | News
Prescriptive requirements for wood structures up to 18 stories were among the additions preliminarily approved for the International Building Code following the work of the International Code Council’s ad-hoc Tall Wood Buildings Committee.
Wood is widely recognized as a carbon-neutral building material, but its use as a structural material has been mostly limited to residential and low-rise buildings due to its combustible nature. Through recent advances in manufacturing and engineering, wood in the form of mass timber products is increasingly attracting interest as a structural system for tall buildings.
Portland, Ore., recently saw the completion of the eight-story Carbon12, currently the tallest wood building in the United States. Still, progress has been slow in this country as compared to Europe or Canada, where the 18-story-tall Brock Commons, in Vancouver, stands as the tallest timber structure in the world. One significant issue inhibiting widespread adoption in the U.S. is prescriptive building codes, which currently limit the height of wood buildings to 85 feet, or six stories. In December 2015, the International Code Council (ICC) formed an ad-hoc committee to study the impact of tall wood buildings on the building code with the membership voting on the adoption of proposed changes on Oct. 24.
The ICC’s International Building Code (IBC) classifies a high-rise building as any building with an occupied floor 75 feet above the lowest level at which fire department vehicles can access. The 2018 IBC defines heavy timber structural members as Type IV construction, which also includes a range of wood products, such as solid sawn timber, glue-laminated members, and composite wood members. The term mass timber, however, comprises both heavy timber as well as engineered products, many of which the IBC does not reference, such as cross-laminated timber (CLT).
Heavy timber construction is currently limited to a height of 85 feet. Architects can design taller wood structures, but they must demonstrate that the design meets the prescribed code and performs as well or better than a similar concrete or steel structure. This can be a costly and time-consuming process, requiring extensive testing and documentation on the part of the design team and building owner.
Read more on this from Architect Magazine at https://www.architectmagazine.com/technology/support-for-tall-timber-reaches-new-heights-in-the-building-code_o.
by Web Editor | Aug 24, 2018 | News
First Mass Plywood Panel Gets APA Certification
Freres Lumber Company says it has achieved Mass Plywood Panels (MPP) certification under the
APA – The Engineered Wood Association’s ANSI/APA PRG 320 standard.
The product is the first Mass Timber Panel constructed entirely out of Structural Composite Lumber (SCL) worldwide, making it much more cost effective than CLT (cross-laminated timber) options, according to a Freres news release. Mass Timber Panels will allow rapid construction of multi-story structures with pre-fabricated structural wood panels, the release says.
The predictable char rate of mass timber panels allows buildings to be built taller with wood, allowing multi-story structures out of wood up to 18 stories anticipated in the next iteration of the International Building Code (IBC). Wood structures carry a smaller carbon footprint, provide greater sustainability, faster construction with less waste and are an economically favorable construction method compared to concrete and steel, Freres says.
The company says it is continuing to refine the design values of the product line, and will roll out additional MPP product configurations.
From Building Design + Construction: bdcnetwork.com
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by Web Editor | Aug 14, 2017 | News
Roofs made from wood are one or the rarest roof types to find around these days, as concrete slab and shingles take over, according to Choice Solutions Roofing and Exteriors Co. In Oklahoma City.
Wood is not seen as strong as some other materials when it comes to construction, but in general well-maintained roofs made of wood can have a lifespan that ranges from 30 to 50 years. Having a wooden structure on top of a house has several good qualities, and it can look great. Here are some examples of wooden structures which are not the average roof that will provide an idea of how unique and marvelous structure topped off with wood can become.
The Centre Pompidou Metz has a hexagonal pattern of a load-bearing timber roof structure which is visible at night through its transparent covering membrane. It is interesting to know that the inspiration of the roof comes from a woven Chinese hat. Before this one-of-a-kind structure was created, it was studied from every angle to ensure that it would withhold heavy weather conditions. This woven like structure roof is made out of wooden beams, spaced 2.90 meters apart, forming a hexagon pattern that is 90 meters wide.
The timber used is glue laminated which enables the different lengths of the beams and makes them more resistant. It is without a doubt an astounding structure due to its complex curves and counter curves and therefore it is one of the most challenging and largest structure built up to date.
The mesh can allow the roof to expand 40 meters, made from protective fabric which consists of fiberglass and Teflon, forming a membrane over the wooden structure. This layer helps the inside temperature to stay natural. This building was created for displaying art and the goal behind the innovative structure was to draw tourism to Metz, France.
Read more on this from Woodworking Network: https://www.woodworkingnetwork.com/architectural-products/timber-structures-show-potential-wood-construction?ss=news,news,woodworking_industry_news,news,almanac_market_data,news,canadian_news
by Web Editor | Mar 29, 2017 | News
Over the past several years, there has been a rise in mass timber construction around the world, demonstrating the strength, stability, and design flexibility of next-generation lumber technologies. To help inform architects, engineers, developers, industry professionals, students and interested parties, reThink Wood has launched the reThink Wood Research Library to serve as the go-to industry resource for those seeking information on the latest advancements in wood’s performance and advantages in the built environment.
reThink Wood is a body of research hoping to push boundaries and shift perceptions about building with wood.
Today, mass timber technologies, including cross-laminated timber (CLT), nail laminated timber (NLT) and glued laminated timber (glulam), are gaining traction in the U.S. for mid-rise and tall wood structures. The publicly accessible and comprehensive reThink Wood Research Library will be frequently updated with the latest research on wood building products and systems worldwide, as well as demonstrate where research gaps currently exist.
“The future of mass timber in the U.S. is really starting to heat up,” said Lucas Epp, head of engineering at StructureCraft. “In the next few years, there will be considerably more mass timber buildings built than we have today. The industry is starting to see that this type of construction is fast, cost effective and sustainable.”
Advocates of CLT say it can be used to construct buildings of equal strength and fire-resistance as those made of steel and concrete. It has also fueled the passions of architects and environmentalists, who believe it to be a much greener method for housing the world’s growing population.
From Woodworking Network: https://www.woodworkingnetwork.com/news/woodworking-industry-news/wood-research-library-advances-timber-building-construction?ss=news,news,woodworking_industry_news,news,almanac_market_data,news,canadian_news
by Web Editor | Jul 27, 2016 | News
Vancouver-based real estate developer PortLiving and world-renowned Japanese architect Shigeru Ban have unveiled plans for an upcoming hybrid timber structure said to be the tallest in the world. If so, this would mean it will be higher than other CLT wood structures, such as the 34-story design planned for Stockholm.
The residential high-rise Terrace house, which will be located in Vancouver’s Coal Harbor neighborhood, may set a new standard for urban luxury in design, sustainability and engineering innovation. The high-rise will feature a cross-laminated timber frame supported by a concrete and steel core. Wood for the project will be locally sourced from British Columbia, minimizing its carbon footprint.
Cross-laminated timber has been gaining popularity as of late, due to its lightness, sustainability, and ease of use. Planks of timber are glued and orientated at 90 degrees to each other, and are then crosslaid in layers. Those pieces are then shipped to construction sites and can be assembled by just a few workers, even for large buildings.
Its use in tall wooden buildings has also been growing. London, Stockholm, and Quebec are just a few of the cities who either already have large timber towers or have one in the works. Recent plans include a Swedish firm’s 436 ft. residential wood skyscraper in Stockholm, while a 12-story mixed wood high-rise is planned for construction in Portland, Oregon.
Building codes are being adjusted in Oregon and Washington State to permit the tall wood structures. But CLT hasn’t gone without opposition.
From Woodworking Network: https://www.woodworkingnetwork.com/news/woodworking-industry-news/canadian-high-rise-will-be-tallest-timber-structure-world?ss=news,news,woodworking_industry_news,news,almanac_market_data,news
