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NGA reports good news from ASHRAE 90.1 meeting

The NGA and GANA form the largest trade association serving the architectural glass and metals industry supply chain

NGA received three items of good news from the recent ASHRAE 90.1 committee meeting regarding outcomes of the Window Criteria Proposal, the Thermal Bridging Proposal, and Envelope Backstops.

The National Glass Association (NGA) was represented at the recent ASHRAE 90.1 committee meeting by Urmilla Sowell, NGA’s director of technical services and advocacy, Tom Culp, NGA technical consultant and co-vice-chair of the ASHRAE 90.1 committee, and Thom Zaremba, GICC consultant. Culp reported three items of good news to NGA members by email regarding outcomes of the Window Criteria Proposal, the Thermal Bridging Proposal, and Envelope Backstops.
This proposal is a comprehensive update to the fenestration criteria (U-factor and SHGC for windows, entrance doors, and skylights) affecting residential multifamily buildings 4 stories and higher, as well as commercial buildings. This proposal provides an increase in stringency while still being cost effective and practical, and also aligns the product categories to match those used in the IECC without regard to material type. Having been worked on for the past year, the proposal went out for public comment with only small corrections requested. The committee made the corrections at the meeting, and just those small changes will now go out for public review. Assuming there are no more comments, the addendum will go up for final approval at the January meeting.
This controversial proposal that addresses thermal bridges that bypass wall, roof, and floor insulation also completed its first public review. The portions of this wide-reaching proposal that potentially affect the glass industry involved rules on the intersection between window framing and the opaque wall, limitations on attachment area for sun shades, and how thermal bridges could be traded off against wall and window performance. Upon receiving 250 negative comments, the subcommittee is trying to figure out next steps for this proposal.
“Envelope backstops” or limitations on trade-offs when using the performance path is an area of concern. This limits product flexibility, and most importantly, could be used to limit window area in office and high-rise residential buildings even if you show equivalent or better energy performance. Three different approaches have been suggested and the subcommittee will spend more time to discuss and carefully analyze the potential impacts, meaning this would not make its way into the standard until 2022 at the earliest.
“Due to Tom Culp’s work representing NGA at the ASHRAE meeting last week, we’re very hopeful the Window Criteria Proposal will pass in January and make it into the 2019 standard,” said Nicole Harris, NGA president & CEO. “Tom really stepped up for the entire industry and his efforts are appreciated.”
Founded in 1948, the National Glass Association (NGA),, combined with the Glass Association of North America (GANA), on 1 February 2018 to form the largest trade association serving the architectural glass and metals industry supply chain, including glazing contractors, full-service glass companies, glass fabricators, primary glass manufacturers and suppliers to the industry. It is a technical powerhouse that brings some of the best minds to the table to create technical resources and promote and advocate for glass in buildings. NGA’s education and training programs – both online at and in-person at association-sponsored events – and its official publication Glass Magazine and Window & Door, keep the industry knowledgeable and well-informed. NGA also produces the industry’s largest annual trade show in the Americas, GlassBuild America, and hosts the Building Envelope Contractors Conference, the Glazing Executives Forum and other educational and networking events, bringing together thousands of industry professionals to help them build more profitable businesses.

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