Metal roofing systems, owing to their lightweight structure, high degree of factory prefabrication, rapid construction efficiency, and recyclability, have been widely adopted in recent years for new industrial plants, logistics warehouses, cold-chain centers, sports venues, and public buildings across China. In particular, they exhibit excellent synergy with steel structural systems, making them an integral component of building envelope systems. According to industry data from the China Association for Metal Structure Construction, 2023 The nationwide application area of metal roofing has exceeded 2 hundred million square meters, with the annual compound growth rate remaining at 8% As outlined above, the trend shows “expanding scale, diversified types, and broad regional distribution.” Notably, applications in the southern coastal regions, as well as in East and South China, account for more than 60% These issues are primarily concentrated in regions characterized by high temperatures and high humidity, frequent precipitation, or recurrent severe wind events, thereby imposing stricter requirements on the waterproofing reliability, wind‑uplift resistance, and air‑tightness and thermal insulation performance of roofing systems. Although metal roofing has achieved notable success in its widespread adoption, conventional systems generally suffer from the following critical shortcomings:

1. The structure is complex and lacks systemic coherence, making standardized integrated design difficult to achieve.
2. It is highly dependent on auxiliary materials and construction practices, posing a significant risk of water leakage.
3. There is a lack of unified node construction standards, resulting in a high leakage rate at critical joint locations.
4. The roof support structure exhibits poor wind resistance and limited capacity to accommodate thermal deformation.
5. Insufficient adaptability to extreme climates and poor durability;

Accordingly, the industry urgently needs a new type of metal roofing system that not only complies with the nation’s latest waterproofing standards but also offers ease of installation and performance in extreme environments, thereby driving the high-quality development of steel‑structure buildings, green industrial plants, and prefabricated construction in China.

The main contents of this standard are:

In light of the current state of metal roofing and its key technical challenges, this project, in accordance with prevailing national design standards and building upon the envelope systems employed by leading domestic and international architectural firms, has refined… 360 °The laminated standing‑seam roofing system has undergone continuous product iteration and R&D innovation through thousands of project implementations. By deeply integrating structural design, materials, construction techniques, and standardized design, it has established a high‑performance roofing solution that is widely applicable, rigorously standardized, and easy to install. It has also developed a high‑strength, wind‑resistant metal roofing system capable of meeting Class I waterproofing requirements with just a single layer of metal panels. The primary research approach is as follows:

(1 ) Simplified waterproofing structure . Pre‑apply sealant to the roof panels and sliding brackets, employing a double‑standing‑edge, upright‑lock seam system; during the locking process, inject pre‑applied sealant to create a continuous, hermetic, flexible sealing strip. Establish a primary waterproofing pathway based on the metal panel lock‑seam construction, supplemented by auxiliary sealing with flexible sealants, thereby achieving a multi‑layered waterproofing barrier that combines rigidity and flexibility. This approach eliminates the need for multiple layers of waterproofing materials, saving materials and costs while shortening the construction schedule. By utilizing a double‑standing‑edge, upright‑lock seam structure and injecting pre‑applied sealant during the locking process, a continuous, sealed, flexible sealing band is formed to prevent lateral or capillary water penetration; this is accomplished using specialized crimping equipment. 360° The rolled‑edge encapsulation structure automatically reinforces the edge‑locking seal under repeated wind pressure, thereby enhancing its resistance to wind uplift.

( 2 ) Sliding Bracket Optimization . The expansion and contraction deformations of the roof panels caused by thermal expansion and contraction are eliminated by the sliding support connection method. Sliding is achieved by the combination of the lower base and the upper sliding plate of the support, and the optimized design of the bearing has increased the sliding stroke. In addition, The support structure is fabricated from high-strength steel for both the base and the sliding plates, with each individual unit providing an ultimate tensile‑pullout capacity that meets the wind‑uplift resistance requirements of the roof under various load conditions.

( 3 ) Standardization of Node Design The roof is treated as an integrated waterproofing unit, with waterproofing requirements achieved through well‑designed detailing. Specialized optimization is applied to critical junctions—such as gutters, ridges, skylight strips, gable ends, and penetrations—standardizing detailing practices and developing catalog‑based modular details to ensure construction consistency.

( 4 ) Integration of Products and Equipment By adopting a modular product design, developing specialized manufacturing and installation tools, and standardizing construction methods and technical drawings, reliance on the skill level of construction personnel is reduced, thereby significantly improving construction quality.