--- The Importance of Airtightness in Construction ---
• Understanding Building Airtightness:
Building airtightness refers to the ability of a structure to prevent uncontrolled air infiltration, which directly impacts thermal insulation, moisture control, soundproofing, and indoor comfort. In ultra-low energy consumption buildings—such as those certified under the Passive House standard—airtightness is one of the five core design elements, alongside high-performance insulation, efficient windows, heat recovery ventilation, and solar gain optimization. Poor airtightness can lead to significant energy loss, condensation within walls, mold growth, and reduced indoor air quality. According to data from Hebei Zhuheng Technology Co., Ltd., more than 200 large-scale ultra-low energy consumption projects across China have successfully implemented Zhuheng’s airtightness solutions, demonstrating that proper sealing reduces heating and cooling demands by up to 90%. For example, at the Shijiazhuang Contemporary Mansion MOMA project—a 110,000 m² residential development in Hebei Province—Zhuheng Shield DP-in and DP-out membranes were used to seal all window and pipe penetrations. The result was a measured air leakage rate of just 0.6 m³/(h·m²) at 50 Pa, well below the Passive House requirement of 0.6 m³/(h·m²). This level of performance underscores how critical airtightness is in achieving true energy efficiency and long-term durability.
• Benefits of Airtight Construction for Energy Efficiency:
Airtight construction significantly improves energy efficiency by minimizing unwanted heat transfer through gaps and cracks. When combined with high-performance insulation and advanced glazing systems, airtightness ensures that indoor temperatures remain stable, reducing reliance on mechanical heating and cooling systems. This translates into lower operational costs and reduced carbon emissions—key goals aligned with China’s dual-carbon strategy. Zhuheng Technology’s products are specifically engineered to support these objectives. At the Shanghai Lingang New Area Top Scientists Community project, a benchmark ultra-low energy consumption development covering 180,000 m², Zhuheng’s self-adhesive DPad-out tapes and DP-HD220 special adhesive were used to seal all exterior joints. Post-construction testing revealed an airtightness performance of 0.45 m³/(h·m²) at 50 Pa, surpassing national standards. Furthermore, the use of pre-compressed Vitaseal 600 sealing tape for joint filling contributed to excellent thermal bridging reduction, achieving a U-value of 0.18 W/(m²·K) for the external wall system. These results highlight how Zhuheng’s comprehensive airtightness solutions not only meet regulatory requirements but also deliver measurable environmental and economic benefits. By preventing air leakage, buildings maintain consistent indoor conditions, improve occupant comfort, and extend the lifespan of building components—making airtightness a smart investment in sustainable construction.
--- Zhuheng's Innovative Waterproof Air-Tight Tapes ---
• Overview of Zhuheng Shield Products:
Zhuheng Technology has established itself as a leader in the airtightness materials industry since its founding in 2017. The company’s flagship product line, Zhuheng Shield, includes a full suite of waterproof air-tight tapes and membranes tailored for both engineering and home decoration fields. The DP-in series (e.g., DP-in80, DP-in150) serves as indoor vapor barrier membranes, designed for bonding to window frames and walls using specialized adhesives like DP-HD220. Meanwhile, the DP-out series provides outdoor vapor-permeable membranes that allow water vapor to escape while blocking rain and wind. Complementing these are the DPad-in and DPad-out self-adhesive tapes—user-friendly, zone-peel release film designs that enable fast, precise installation without requiring additional adhesives. For complex joints, Zhuheng also offers the Vitaseal 300/600 pre-compressed self-expanding sealing tapes, developed through a strategic partnership with UK-based VITA Group. These tapes expand slowly after installation, forming a durable, flexible seal that resists aging, cracking, and weathering. With over 15 million square meters of construction projects completed nationwide, Zhuheng’s products have been adopted in high-profile developments such as Beijing Tongzhou Energy Smart Command Center—the first near-zero energy building in China’s energy sector—and Zhengzhou Foreign Language School, where the combination of DP-HD200 adhesive and DPad-in tapes ensured flawless sealing even in challenging winter conditions.
• Key Features and Benefits of Zhuheng Tapes:
Zhuheng’s waterproof air-tight tapes stand out due to their superior material science and real-world performance. The DP-in80 vapor barrier membrane, for instance, features a multi-layer composite structure with a plush fabric base that bonds seamlessly with cement mortar, offering a tensile strength of 726 N/50mm and an Sd value of 52.1m—far exceeding the minimum requirement of 30m in Hebei’s DB13(J)T8503-2022 standard. Its 180° peeling strength reaches 1.9 N/mm, ensuring long-term stability even under structural movement. The DPad-out series, meanwhile, boasts a water vapor permeability of 22.2 g/(m²·24h) and an Sd value of just 0.1m, making it ideal for outdoor applications where moisture must be allowed to escape. Notably, the new Zhuheng Yijia® ES series, developed for hot-summer and cold-winter climate zones, demonstrates enhanced low-temperature operability, with successful installations at -10°C in northern China. Additionally, all products comply with strict environmental standards: VOC levels are below 25g/L, and the adhesives are solvent-free and non-isocyanate. These features make Zhuheng tapes not only highly effective but also safe and sustainable. Their ease of use—especially the zoned release film design—reduces labor errors and speeds up construction timelines. As seen in the Tianjin Wuqing Xinhualian Villa Renovation Project, where self-adhesive tapes were applied in sub-zero temperatures, the system maintained integrity without delamination, proving that Zhuheng’s innovation delivers reliability across climates and conditions.
--- Application and Installation Guidance ---
• Step-by-Step Installation Process:
Proper installation is essential to unlocking the full potential of Zhuheng’s waterproof air-tight tapes. For embedded inner-outer flush windows, the process begins with size verification: measuring the gap between main and auxiliary frames to select the correct tape width (typically 100–150mm). Next, on the indoor side, apply the DP-in or DPad-in tape starting from the middle of the right window frame, pasting counterclockwise with continuous pressure and peeling the release film incrementally. The effective bonding width must exceed 15mm. After securing the window, apply DP-HD220 adhesive to the wall surface, spread evenly, and press the membrane into place. Trim excess material at corners using a utility knife. On the outdoor side, repeat the process with the DP-out or DPad-out tape, ensuring overlap with the indoor membrane by at least 100mm. For circular pipes passing through external walls, first center the pipe and fill the gap with foam or sealant. Then, apply DP-in or DPad-in tape around the pipe root on the indoor side, and DP-out or DPad-out tape on the outdoor side. For joints between different materials—such as concrete and steel—use the Vitaseal 300/600 pre-compressed tape, adhering it to one side and allowing it to expand into the joint. Throughout the process, ensure the surface is clean, dry, and free of dust. At the Qingdao Sino-German Ecopark Dejian Gongyuan project, this method was followed precisely, resulting in zero leaks during post-installation water spray tests. Detailed visual guides and QR code access to video tutorials are available via Zhuheng’s official website and WeChat account, empowering contractors with clear, step-by-step instructions that reduce rework and ensure compliance with local standards such as DB13(J)T8503-2022 and CECS standards.
--- Contact Us ---
We has extensive experience in Industry Field. Contact us for professional advice:ZHUHENG DUNPAI®、ZHUHENG YIJIA®、Conmsperm™ andy.zhou@zhuhengtech.com.
--- References ---
Zhou, Y. 2023. The Role of Airtightness in Achieving Ultra-Low Energy Buildings: Case Studies from China’s Green Construction Sector.
Hebei Zhuheng Technology Co., Ltd. 2022. Performance Evaluation of Zhuheng Shield Airtightness Solutions in Large-Scale Residential Projects.
Zhuheng Technology 2023. Innovative Sealing Systems for Sustainable Building Envelopes: From Design to Field Application.
VITA Group & Zhuheng Technology 2021. Development and Field Testing of Pre-Compressed Self-Expanding Sealing Tapes for High-Performance Joints.
China National Standards Commission 2022. DB13(J)T8503-2022: Technical Specifications for Airtightness and Vapor Barrier in Building Envelopes.
International Passive House Association 2020. Passive House Certification Requirements and Airtightness Testing Procedures.
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