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The technological evolution of external wall insulation materials is the result of the combined effects of China's building energy efficiency policies, breakthroughs in material science, and innovations in construction techniques. Its development can be divided into four key stages, each accompanied by standard upgrades, material substitutions, and system reconfigurations.

1. Initial exploration period (1980s–1990s): From "gap filling and insulation" to technology introduction

Early practice: Before the 1980s, building insulation relied on traditional materials such as earthen walls and sticky rice mortar, without a systematic external insulation system.

Technology introduction: In 1986, the "Energy Efficiency Design Standard for Civil Buildings (JGJ26-86)" first proposed a 30% energy saving target, promoting the improvement of air tightness of doors and windows. However, exterior wall insulation was still in its infancy.

Material Emergence: In the mid-1990s, the German EPS thin plastering system was introduced, becoming the first standardized external insulation system. However, its construction relied on manual plastering, which was prone to cracking and had numerous thermal bridges.

Key milestone: The implementation of the Energy Conservation Law in 1997 marked the entry of building energy conservation into a legalized track.

2. Rapid popularization period (2000–2012): XPS and PUR dominated, achieving energy savings of 50%→65%

Policy-driven: In 2005, a 50% energy-saving standard was implemented nationwide. Since 2012, Beijing, Shandong, and other regions have taken the lead in implementing a 65% energy-saving standard, forcing material upgrades.

Mainstream materials:

XPS extruded board: The first domestic production line was put into operation in 2000, with a 50% cost reduction. Due to its low water absorption rate and high compressive strength (≥250kPa), it has become the preferred choice for exterior walls in the north, widely used in residential buildings and floor heating systems.

Rigid polyurethane (PUR): Since 2003, spraying technology has been promoted, forming a seamless continuous insulation layer with a thermal conductivity as low as 0.020 W/(m·K), used in high-end projects.

Problem exposure: EPS/XPS are Class B2/B1 combustible materials. After the CCTV fire in 2009, fire safety became a pain point in the industry.

Turning point: In 2014, the "Code for Fire Protection Design of Buildings" was implemented, strictly controlling the height of organic insulation materials and promoting the substitution of Class A materials.

3. System innovation period (2013-2020): The rise of insulation and decoration integrated panels, with standardized lap joint structure

Technological breakthrough: China pioneered the insulation and decoration integrated panel in 2004, published the industry standard JG/T287-2013 in 2013, and included it in the national encouraged industry catalogue in 2019.

Lapped structure: It adopts a concave-convex groove insertion method to achieve seamless engagement of board joints, and cooperates with sealant to form a "double waterproofing" system, completely solving the problems of cracking and leakage in traditional thin plastering.

Construction revolution: factory prefabrication and on-site dry work, reducing the construction period by 50% and minimizing wet work, especially suitable for construction in the winter in the north.

Material upgrade: The core material has shifted from EPS to XPS, PUR, and rock wool, while the decorative layer has evolved into real stone paint, metal plates, and imitation stone materials, achieving the integration of "thermal insulation + decoration".

Shandong Practice: From 2025 onwards, the renovation of old residential areas in places like Linyi will fully promote the use of lap-joint integrated panels, making it the primary solution for "ultra-low energy consumption buildings".

4. High-end breakthrough period (2021-2026): Aerogel and VIP lead the era of ultra-low energy consumption

Aerogel composite material:

In 2022, China National Chemical Engineering achieved the industrialization of 50,000 m3/year of silicon-based aerogel, with a thermal conductivity as low as 0.015–0.008 W/(m·K).

With a thickness only 1/5 of XPS, it is suitable for ultra-thin walls, curtain wall interlayers, and retrofitting existing buildings. In 2026, it has been piloted in some high-end residential areas in Linyi.

Vacuum Insulation Panel (VIP):

With the implementation of the national standard GB/T 37608-2019 in 2020, a material with a thermal conductivity of ≤0.006 W/(m·K) and a thickness of only 3cm can replace 15cm of rock wool.

Applied to ultra-low energy consumption buildings, passive houses, and facades of public buildings, such as the venues for the Beijing Winter Olympics and Shanghai's zero-carbon communities.

Intelligent Collaboration: BIM technology is utilized for thermal bridge simulation and lapping layout optimization; green certification (GB/T 50378) promotes the application of low VOC and recyclable materials.

Frontier Trend: In January 2026, domestic enterprises have initiated mass production of nanofiber aerogel, achieving breakthroughs in flexibility, tailorability, and impact resistance, laying the foundation for future "wearable building insulation".

Comparison of core driving forces of technological evolution

Adaptability of technological evolution in Linyi region, Shandong

XPS and integrated panel: Due to their strong resistance to freeze-thaw cycling and stable local supply, they remain the mainstream choice, accounting for over 70% of new construction projects in 2025.

Aerogel/VIP: Pilot applications in government demonstration projects, high-end residential buildings, and energy-saving renovation of existing buildings still incur high costs, but policy subsidies are gradually being extended to cover them.

Construction Specifications: In 2025, the Linyi City Housing and Urban-Rural Development Bureau issued the "Technical Guidelines for External Wall Insulation System Construction," which mandates that lap joints must provide a buckle groove structure inspection report to eliminate "pseudo-lap joint" products.

New trend in 2026: According to the new regulations of "Mandatory Implementation of Carbon Emission Calculation in the Construction Sector" (from April 2025), projects using VIP or aerogel can receive extra points in carbon emission reduction accounting, accelerating the penetration of high-end materials.

Summary of technological evolution trends

Materials: From organic to inorganic to nanocomposite, emphasizing both fire resistance and performance.

Structure: From pasting → anchoring → lapping and grooving → modular integration, the degree of systematization is improved.

Process: From wet work to dry work, then to factory prefabrication + intelligent installation, marking a leap in industrialization level.

Goal: From 50% energy saving → ultra-low energy consumption → zero-carbon building, with a clear and traceable technological path.

Future Directions: Aerogel and photovoltaic integrated insulation wall panels, self-healing sealing materials, and AI construction robots are entering the fast lane of research and development.

Shandong Huaneng Thermal Insulation Materials Co., Ltd. is a Linyi pipeline insulation manufacturer. As a Shandong insulation decoration integrated manufacturer, our main products include: insulation decoration integration, pipeline insulation, exterior wall insulation materials, extruded boards, thermosetting polystyrene boards, and rubber insulation. If you have any needs, please feel free to contact us.