1、 System Overview

Rock board insulation and decoration integrated board is a new type of external wall insulation system material that prefabricated the decorative surface layer (ceramic rock board) and insulation core material in the factory. This system integrates thermal insulation, decoration and beautification, fire prevention and waterproofing, and is connected to the base wall through a composite method of "pasting+anchoring" to achieve the integration of thermal insulation and decoration functions.

In recent years, with the improvement of building energy-saving standards and stricter fire prevention requirements, integrated insulation and decoration panels have been increasingly widely used in energy-saving renovations of new and existing buildings due to their advantages such as A-level fire protection and prefabricated construction. Starting from June 2025, new building exterior wall insulation systems nationwide must use Class A fire-resistant materials, and integrated panels have become the preferred system solution for compliance.

2、 Basic System Architecture

The rock board insulation and decoration integrated board external wall insulation system mainly consists of the following levels:

Construct hierarchical materials to form core functions

Main building structures such as concrete and masonry walls at the grassroots level

Special polymer bonding mortar for bonding layer fixes the board to the base layer

Insulation core material rock wool board (Class A fireproof) insulation core layer

Decorative layer ceramic rock panel (5.8-12mm), weather resistant, and stain resistant

Anchor parts made of stainless steel/nylon anchor bolts are mechanically fixed with double safety

Sealing material: Silicone weather resistant sealant, waterproof, breathable, and stretchable compensation

Core Composition Description:

-Rock panel decorative layer: As an external decorative layer, the rock panel has a low water absorption rate (≤ 0.5%), excellent anti fouling performance, and long-lasting freshness. The thickness of the rock slab is usually 5.8mm-12mm, and the surface density is controlled at ≤ 20kg/m ² to meet the installation requirements of high-rise buildings

-Insulation core material: A-grade fireproof rock wool board is used, with a thermal conductivity of ≤ 0.040 W/(m · k), a water repellency rate of ≥ 98%, and a thickness determined according to regional energy-saving standards (usually 50-100mm)

-Anchor system: Single point anchor force ≥ 0.6kN, no less than 6-8 anchor components per square meter, and full-length brackets are installed on each floor of high-rise buildings

3、 Scope of application

The rock board insulation and decoration integrated board external wall insulation system is suitable for the following scenarios:

1. New construction

-High rise residential buildings, commercial housing, and affordable housing

-Public buildings: office buildings, hotels, schools, hospitals, shopping malls

-Meet the green building evaluation standards and 75% energy-saving requirements

2. Energy saving renovation of existing buildings

-Energy saving renovation of exterior walls in old residential areas

-No need to remove the original decorative surface, direct pasting construction, greatly reducing the construction period

3. Applicable height restrictions

According to local standards, when the density of rock board insulation decoration surface is ≤ 20kg/m ², the applicable building height should not exceed 60m

4、 Technical standards and design requirements

4.1 Main Execution Standards

Standard Number Standard Name

JG/T 287-2013 (to be updated to 2025 version) Thermal insulation decorative panel exterior wall external insulation system materials

JGJ 144-2019 Technical Standard for External Wall Insulation Engineering

GB 8624-2012 Classification of Burning Behavior of Building Materials and Products

DB32/T 4117-2021 Technical Specification for External Thermal Insulation System of Exterior Walls with Thermal Insulation Decorative Panels (Jiangsu)

XJJ 113 Application Technical Standard for Thermal Insulation Decoration Integrated Board (Xinjiang)

4.2 Key points of design requirements

1. Refine the design

The insulation decorative panel system should undergo specialized and detailed design, including:

-Layout plan of exterior panel grid

-The connection and fixation method with the exterior wall of the building

-Detailed drawing of key node construction (external corners, internal corners, door and window openings, parapet walls, footings, deformation joints, etc.)

2. Material requirements

-The combustion performance level of insulation core material should be Class A

-Single board weight ≤ 20kg, single board area ≤ 1 ㎡

-Adhesive should comply with JG/T 480 standard

-The sealant should undergo compatibility testing with the decorative panel

3. Bracket requirements (high-rise buildings)

-At least one aluminum alloy or stainless steel bracket should be installed on each floor

-Bracket thickness ≥ 2mm, anchored to concrete components

5、 Construction process flow

5.1 Overall Process

Grassroots treatment → measurement and laying out → cutting and processing → preparation of bonding mortar → pasting of boards

→ Anchor installation → Board seam treatment → Installation of exhaust plug → Cleaning and acceptance

5.2 Construction Preparation

Grassroots requirements:

-The grassroots wall must pass the structural acceptance inspection

-Flatness deviation ≤ 4mm/2m, verticality deviation ≤ 5mm

-No hollowing, cracking, oil stains, or floating dust

-The old wall surface needs to be cleaned of hollows and weathered parts and leveled with cement mortar

Construction environmental conditions:

-Environmental temperature ≥ 5 ℃

-Wind speed ≤ 5 levels

-Prohibit working on rainy or foggy days

Sample first: A sample wall should be made before construction, and large-scale construction can only be carried out after confirmation by the designer, party A, and supervisor

5.3 Measurement and laying out

-Use a theodolite or plumb line to mark the exterior and starting lines of the building on the wall

-Pop up the horizontal and vertical grid lines for each board according to the layout diagram

-Hang vertical reference steel wire at the large corners (male and female) of the building

5.4 Board cutting and slotting

-Use a precision push table saw for cutting, with a feed speed of ≤ 8 meters per minute

-When the thickness of the rock slab is 6-8mm, grind the edges all around the surface of the panel, with a width of 2.5-3mm and a depth of 2-2.5mm

-When the thickness of the rock slab is greater than 8mm, groove at a distance of 50-80mm from the slab corner, with a depth of 6-8mm and a width of 2mm

5.5 Adhesive construction

Preparation of bonding mortar:

-Strictly prepare according to the water cement ratio in the product manual, and mix electrically until there are no dry powder particles

-After being left to mature for 5 minutes, use up within 2 hours

Glue method (recommended "dotted box method"):

-Apply 50-60mm wide bonding mortar frame around the back of the board

-Arrange several bonding mortar points evenly within the frame

-Total bonding area ratio: ordinary buildings should be ≥ 40% -60%, high-rise buildings should be ≥ 50%, and the full bonding method can reach over 95%

Key points for pasting:

-Install from bottom to top and horizontally in sequence

-The first layer board is installed on the starting bracket

-Place the suction cup in place and adjust the flatness with a rubber hammer

-The width of the board joint shall be controlled according to the design requirements (usually 8-12mm)

5.6 Anchor installation

Installation timing: After 24 hours of pasting the board onto the wall, the bonding mortar will set initially

Construction steps:

1. Mark the drilling points at the slotted positions of the wall and board according to the design drawings

2. Impact drilling, hole depth ≥ anchor bolt length+10mm

3. Install anchor bolt sleeve

4. Tighten the screws to make the anchor plate level with the board surface

Anchor requirements:

-Effective anchorage depth into concrete base ≥ 25mm

-Entering the masonry wall ≥ 50mm

-Number of anchors per square meter: ≥ 6 for lower floors and ≥ 8 for higher floors

-Encrypt the edges of corners, door and window openings

-Install full-length brackets on each floor of high-rise buildings

5.7 Board seam treatment

Construction sequence:

1. Clean the board seams: remove dust and debris

2. Filling back lining: embedded polyethylene foam rod (diameter slightly greater than 1.2-1.5 times of seam width)

3. Paste decorative paper: Paste on both sides of the board seam to prevent contamination of the decorative surface

4. Apply sealant: Use weather resistant silicone sealant and inject continuously and fully

5. Glue repair: Scrape into a concave arc shape and immediately tear off the decorative paper

Additional waterproof requirements: The base wall should be waterproofed as a whole, using polymer cement waterproof mortar, and each layer should be equipped with anti cracking measures such as dividing joints

5.8 Installing exhaust plugs

-Set one exhaust hole every 10-15 square meters according to the wall area

-Installed at the intersection of horizontal and vertical board joints

-After drilling, apply sealant inside the hole and around the exhaust plug before embedding

-The exhaust hole is facing downwards to ensure unobstructed flow

6、 Key points of quality acceptance

6.1 Material entry re inspection

Testing items testing content

Density of insulation decorative panel surface and tensile bonding strength between panel and insulation core material

Apparent density, thermal conductivity, water absorption, and combustion performance grade of insulation core material

Bonding strength of bonding mortar at room temperature and water-resistant tensile strength

Adhesive strength and compatibility between sealant and decorative panel

6.2 On site performance testing

-Thermal insulation decorative board bonding area ratio testing (≥ design requirements, high-rise buildings should be ≥ 95%)

-On site pull-out test for bonding strength of external insulation system

-Anchor pulling force detection (single point ≥ 0.6kN)

6.3 Concealed acceptance items

-Grassroots and surface treatment

-Safety bracket setting

-Adhesive method and bonding area of insulation decorative board

-Anchor components and anchoring node methods

-Construction methods for nodes such as door and window openings, parapets, and waistlines

-Method of deformation joint

6.4 Installation allowable deviation

Project allowable deviation

Surface flatness ≤ 3mm/2m

Verticality of facade ≤ 3mm/2m

Square shape of yin and yang corners ≤ 3mm

Seam straightness ≤ 3mm/5m

Seam height difference ≤ 1mm

Seam width ± 1mm

7、 Summary of Advantages

Specific Explanation of Advantage Dimensions

The energy-saving and efficient system has a high thermal resistance value, meeting 75% energy-saving requirements and reducing cold bridge effects

A-level fireproof rock wool core material+A-level decorative panel, fully meeting the mandatory standards from 2025 onwards

Decorative durable rock panel veneer has low water absorption rate, strong stain resistance, long-lasting freshness, and a service life of ≥ 25 years

Efficient factory prefabrication and on-site dry operation, reducing the construction period by more than 40% compared to traditional processes

Safe and reliable triple fixation of adhesive+anchor+bracket, strong wind pressure resistance, suitable for high-rise buildings

Suitable for a wide range of new construction and renovation projects, fully covering areas with severe cold, hot summers, and cold winters

8、 Precautions

1. It is strictly prohibited to use materials below B1 level: Starting from June 1, 2025, the external wall insulation system of new buildings in China must use A-level fireproof materials

2. Height limit: When the density of the rock board insulation decoration surface is ≤ 20kg/m ², the applicable height should not exceed 60m; if it exceeds this height, special demonstration is required

3. Waterproof design: The overall waterproofing of the base wall should be carried out, and the effective bonding between the insulation decorative board and the base is the key

4. Construction environment: Construction is strictly prohibited when the temperature is below 5 ℃, there are strong winds of level 5 or above, and it is raining

5. Professional subcontracting: The insulation and decoration board project should be constructed by professional units with corresponding qualifications, and it is not allowed to designate or indirectly designate production plants or suppliers

9、 Regional adaptability explanation

Technical key points of regional types

In extremely cold regions (northeast and northwest), increase the thickness of the insulation layer (preferably ≥ 100mm), use high hydrophobic rock wool to prevent condensation, and strengthen the anchoring density

The insulation thickness in cold regions (North China) is 80-100mm, meeting the 75% energy-saving standard

In hot summer and cold winter regions (East and Central China), the insulation thickness is 50-70mm, with a focus on moisture resistance and anti condensation

High rise buildings must adopt a dual safety structure of mechanical anchoring and bonding, with full-length brackets added to each floor to ensure wind pressure safety