National upgrade of bridge insulation aluminum profile standard
In order to further promote energy conservation and carbon reduction in the construction industry and implement the dual carbon strategy goals, the country continues to improve the relevant standard system for bridge insulation aluminum profiles, and fully implements multiple mandatory new regulations, promoting the industry to cross from the "qualified bottom line" to the "quality upper limit". The Ministry of Housing and Urban Rural Development has explicitly required that new buildings nationwide fully implement the "General Code for Building Energy Efficiency" (GB 55015-2021), which imposes strict mandatory requirements on the thermal performance of insulated aluminum profile doors and windows with broken bridges. The heat transfer coefficient K value of ordinary newly built residential windows shall not exceed 1.5W/(㎡· K), and in cold and frigid regions, which are key areas for building energy efficiency, the standards are even more stringent, and the K value must be controlled within 1.3W/(㎡· K). This requirement directly forces companies to abandon traditional low-end production processes and instead adopt combination solutions such as multi cavity profiles, wide insulation strips (≥ 25mm), and Low-E energy-saving glass to improve the insulation performance of doors and windows from the source.
At the same time, the new version of the national standard for wall thickness of profiles has been upgraded synchronously, clarifying that the minimum wall thickness of outdoor broken bridge aluminum main profiles shall not be less than 1.8mm, which is 0.2mm higher than the original standard, further strengthening the structural strength, wind pressure resistance and durability of profiles, and effectively rectifying the long-standing problem of "thin-wall theft" in the industry. In addition, as the core energy-saving component of the broken bridge aluminum profile, the standard of the insulation strip has also been optimized synchronously. The heat-resistant test temperature has been raised from the original 60 ℃ to 90 ℃, and its positioning as a structural component rather than an accessory has been clarified. The GB/T 23615.1-2017 standard is strictly followed, and higher requirements are put forward for dimensional accuracy, mechanical performance, and thermal stability.
The housing and construction department has further clarified that the energy-saving performance of doors and windows will be included in the core content of construction drawing review and completion acceptance of building projects. Projects that do not meet the standards will not be accepted, and unqualified products are strictly prohibited from entering the site for use. This standard upgrade not only promotes the technological upgrade of the bridge insulation aluminum profile industry, but also helps China's building energy efficiency level reach a new level, providing strong support for the green and low-carbon development of urban and rural construction. It is expected to promote the industry's energy efficiency to increase by more than 20% and reduce a large amount of building energy consumption every year.
