The lap-joint high-performance insulation board is a building energy-saving material that integrates thermal insulation, structural sealing, lightweight high-strength, and rapid construction. Its core feature lies in the use of a concave-convex interlocking groove lap joint structure at the board edges, achieving seamless connection of board joints and effectively blocking thermal bridges and moisture penetration. It is widely used in cold regions for building exterior walls, roofs, sunrooms, and other scenarios.
Technical characteristics and material composition
Extremely low thermal conductivity: The thermal conductivity of mainstream products can be as low as 0.0191 W/(m·K) (such as metal insulation boards), which is much lower than that of traditional cement mortar (1.3 W/(m·K)). With the same insulation effect, the thickness can be reduced by more than 80%.
Lightweight and high strength: With a weight per unit area of only about 3.6 kg/m2, it significantly reduces building loads and enhances seismic performance.
Fire rating of B1 or above: The core material has undergone flame retardant treatment, meeting the basic requirements for combustion performance and smoke toxicity specified in the "Industry Standard Conditions for Building Insulation Materials (2025 Edition)".
Waterproof and moisture-proof: The lap joint structure, coupled with sealant treatment, effectively prevents water infiltration and mold growth caused by the freezing and thawing cycles of rain and snow. It is suitable for regions with distinct seasons and wet, cold winters, such as Linyi in Shandong Province.
Excellent durability: Impact resistance strength standard type ≥3J, no cracks or powdering after 250 hours of artificial weathering, with a service life of up to 25 years or more.
The mainstream material types include:
In the market, "lapped" products are commonly marketed under names such as "insulation and decoration integrated panel", "self-adhesive insulation board", and "XPS channel board". When purchasing, users should pay attention to the design of the lapped board edge structure and the sealing process description.
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National and industry standards basis
"Industry Standard Conditions for Building Insulation Materials (2025 Edition)" jointly issued by the Ministry of Industry and Information Technology and four other departments, explicitly includes polystyrene foam, rigid polyurethane foam, rock wool, etc. in the scope of management, requiring enterprises to have a complete quality control system and safety production standards.
JG/T 169-2016 "Thermal Insulation Boards for Building Partitions": Although it is targeted at non-load-bearing partitions, its requirements for bending resistance ≥1.5 times the board weight and fire resistance limit ≥1.0 hour can serve as a reference for the performance of lapped insulation boards.
GB/T 10801.2-2018 "Thermal Insulation - Extruded Polystyrene Foam (XPS)" specifies core indicators such as thermal conductivity, compressive strength, and water absorption of XPS boards, serving as an important basis for selection.
Application scenarios and construction techniques
Typical application scenarios
Building exterior walls: energy-saving renovation of new residential buildings and public buildings
Roofing system: insulation layers for flat roofs and sloping roofs, especially suitable for sunrooms and greenhouse roofs
Ground insulation: Floor heating system cushion, used in conjunction with XPS board
Core construction technology: lap-type wet bonding + anchoring method
Base treatment: Level the wall surface, remove floating dust and oil stains, and ensure the bonding surface is solid and dry.
Snap lines and divide grids: Snap horizontal and vertical control lines according to the design layout plan to ensure neat lap joints.
Adhesive application: Apply a special polymer mortar evenly to the back of the board, with a thickness of 3-5mm.
Lap installation: It adopts a concave-convex groove type insertion, ensuring tight engagement between boards to avoid misaligned joints.
Anchor reinforcement: At the intersections of slab joints or at the corners, plastic expansion screws are used for mechanical anchoring (≥4 per square meter).
Sealing treatment: The board joints are filled with closed-cell foam strips, and the outer layer is injected with silicone sealant to form a "double waterproofing".
Decorative layer: It can be directly sprayed with real stone paint, fluorocarbon paint, or covered with metal decorative panels, achieving the simultaneous completion of "thermal insulation + decoration".
Compared to traditional thin plastering techniques, this process shortens the construction period by over 50% and reduces wet work, making it particularly suitable for construction in the northern winter.
Video content display: The entire process of wet bonding and anchoring of real rock inorganic imitation stone insulation integrated panels, including key steps such as slotting, glue application, hanging piece installation, expansion nail fixation, and sealant injection, visually presents the construction details of the lap joint structure.
The content of the notes covers:
"Recommendation for Insulated Decorative Integrated Panels": Comparing the Insulation Performance and Price Range of Panels from Different Brands
"Guide to Purchasing Insulated Integrated Panels": A pitfall avoidance guide emphasizing "checking the panel edge structure, reviewing inspection reports, and selecting reputable manufacturers"
Current issues and trends
Market confusion: Some businesses mistakenly label "self-adhesive aluminum foil rubber and plastic board" as "lapped insulation board", which is actually a flexible roll material without structural lapping capability. Be wary of false advertising.
Strong dependence on construction: The quality of lap sealing is highly dependent on the skills of workers, and the lack of standardized training can easily lead to leakage hazards.
Technology trends:
Digital construction: BIM technology is used to simulate overlap arrangement and thermal bridge analysis, enhancing design accuracy.
Material upgrade: Aerogel composite insulation boards and vacuum insulation panels (VIP) are gradually entering high-end projects, with thermal conductivity coefficients that can be lower than 0.008 W/(m·K).
Green certification: Projects that comply with the "Evaluation Standard for Green Buildings" GB/T 50378 give priority to the use of recyclable materials and low VOC products.
Application suggestions for Linyi region, Shandong
XPS or rigid polyurethane is preferred: it is suitable for severe winter cold (with a minimum temperature of -15℃) and has excellent freeze-thaw resistance.
Recommended brands: Huaneng Insulation and others have a stable supply network in North China, with fast response to after-sales service.
Construction window period: It is recommended to carry out construction during March to May or September to November, avoiding the rainy season and extreme low temperatures to ensure the curing quality of the adhesive.
Policy support: Shandong Province has launched a pilot program for "ultra-low energy consumption buildings", utilizing insulation materials that comply with the "Regulatory Conditions (2025 Edition)", eligible for energy-saving subsidies.
Attachment: Typical product structure cross-section diagram
The multi-layer composite structure of the thermal insulation and decorative integrated panel (decorative layer + insulation layer + bonding layer)
The lap-joint groove connection node clearly demonstrates the concave-convex engagement and sealant filling position
The plug-in installation profile of metal insulation boards embodies lightweight, high strength, and thermal bridge blocking design
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E-mail: huanengbw@126.com
Address: Linyi National High tech Zone New Materials Park
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