by Web Editor | Nov 12, 2018 | News
The Environmental Protection Agency (EPA) has proposed technical amendments to its formaldehyde emissions standards for composite wood products.
Published last week in the Federal Register, the proposed changes primarily address concerns over testing and certification provisions of the rule published in December 2016, which require suppliers, importers, and manufacturers of hardwood plywood, MDF, and particleboard to limit the products’ formaldehyde emissions.
The EPA proposed removing the requirement for annual correlations between third-party certifiers and other mill quality testing procedures. The changes also clarify labeling requirements.
The changes are meant to streamline compliance and align more closely with the California Air Resources Board (CARB) Toxic Control Measures (ATCM) Phase II.
Public comments from a June meeting influenced the proposed rule. The meeting was held to address technical issues, like correlation and equivalence of testing methods, how test data is treated, and handling sampling requirements. Public comments on the latest proposed changes will be accepted until December 3.
Read more on this from Woodworking Network at https://www.woodworkingnetwork.com/news/woodworking-industry-news/epa-updates-clarifies-formaldehyde-emission-standards-composite-wood?ss=news,news,woodworking_industry_news,news,almanac_market_data,news,canadian_news.
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.
