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 | Nov 3, 2017 | News
American Wood Council released the following statement regarding the U.S. House of Representative’s passage of the Resilient Federal Forests Act of 2017 (H.R. 2936). The bill (H.R. 2936) includes the research title of the Timber Innovation Act (H.R. 1380/S. 538), which would establish a performance driven research and development program for advancing the use of innovative wood products in building construction.
“The United States has an opportunity to help bring an innovative and sustainable technology to our nation’s construction industry,” said AWC president and CEO Robert Glowinski.
“This bill includes language directing the technical assistance and research components already in place at the U.S. Department of Agriculture to facilitate the use of these innovative wood products into mainstream construction through research and development, education, and technical assistance. Supporting mass timber construction is a win-win because it would introduce new carbon-neutral building materials to our urban areas, as well as job creation in rural areas.”
Congressmen Bruce Westerman (R-AR), Mike Conaway (R-TX) and Mike Thompson D-Calif.) helped sponsor and advance the bill.
From Woodworking Network: https://www.woodworkingnetwork.com/wood/pricing-supply/wood-council-applauds-house-passage-resilient-federal-forests-act?ss=news,news,woodworking_industry_news,news,almanac_market_data,news,canadian_news
by Web Editor | Nov 2, 2015 | News
From: Panel World Staff
Jackson Morrill, president of Composite Panel Association, updated the executive committee’s recommendations on “policy positions” with regard to energy/biomass issues that impact wood fiber supply during the September Fall Meeting in Banff, Alberta.
CPA opposes government policies that distort the market for woody biomass raw material, Morrill noted, adding that market forces should determine all uses of wood and wood residuals for renewable energy; policies that have the direct effect of diverting biomass supply to subsidized energy should be avoided; and governments that choose to initiate policies intended to increase demand for biomass energy production should couple them with policies that increase the available long-term supply of wood to meet future demand of composite wood panels as well as new and growing markets for energy and other uses.
Morrill said CPA will stay silent on the carbon neutrality of wood-to-energy, noting however that forest derived biomass should be treated as carbon neutral where there is a sustainable growing forest; within carbon accounting frameworks, the composite panel industry’s use of wood residuals to make long-lived products should be treated as a higher value use than energy recovery; the composite panel industry’s use of wood residuals is an important alternate use that should be considered when determining the scope of “qualified biomass” under the U.S. EPA Clean Power Plan.
Morrill said CPA will advocate that composite wood products be recognized for their carbon sequestration benefits; that public policies should recognize that sustainably managed forests and forest products sequester and store carbon and reduce CO2; the use of biomass in creating long-lived products that serve as carbon sinks should be formally recognized in any carbon calculations that might be referenced in a future carbon economy.
