Brief Description:Precast render-coated vertical-fibre rock wool panel features A1 non-combustible performance for ETICS systems. Pre-bonded anti-crack render layers save onsite labour. High pull-out strength, hydrophobic and weather resistant. Ideal for new facades and energy retrofits with custom sizes, factory inspection and samples available.

Haochen Precast Render-Coated External Wall Rock Wool Panel, also referred to as external wall rock wool composite panel, is a mainstream Euroclass A1 non-combustible integrated thermal insulation panel designed for External Thermal Insulation Composite Systems (ETICS). The panel uses premium basalt vertical-fibre rock wool as its core substrate, bonded on both sides with high-strength crack-resistant cement render layers. The render facings are laminated, cured and fully prefabricated under factory-controlled conditions.

These panels come supplied with integral protective render facings. Featuring flat surfaces, high hardness and exceptional monolithic integrity, they fundamentally resolve common drawbacks of conventional rock wool boards: soft texture, high water absorption, tendency to crack, complicated on-site installation and low workmanship yield. Combining fire resistance, thermal insulation, crack resistance, weather resistance and acoustic attenuation, the product is widely suitable for diverse external wall thermal insulation and fire protection works. All performance parameters comply with relevant specifications governing building energy conservation and fire safety.

1. Core Product Structure & Fabrication Advantages

1.1 Factory Precast Render Facings, Greatly Simplifying Thin-Coat Render Installation

Conventional bare rock wool for external walls is installed under the traditional two-mesh three-coat thin render system. This method involves multiple working stages, high labour cost and extended site programmes. Finished quality is heavily reliant on the skill of on-site operatives, frequently resulting in typical site defects: hollowing, cracking, uneven render surfaces and delamination caused by moisture ingress.

Haochen Precast Render-Coated External Wall Rock Wool Panel arrives on site with the base crack-resistant render layer fully cured. The panel surface is dense, rigid, structurally robust and dimensionally stable. On-site repeated base levelling and multiple mesh-and-render operations are eliminated. After adhesive bonding and mechanical anchoring of the panels, one layer of alkali-resistant glass fibre mesh is embedded, followed by a single top coat of crack-resistant render to complete the works. This greatly streamlines the ETICS workflow, shortens the overall construction period and minimises workmanship variation arising from manual site application. It delivers flatter, more uniform external wall finishes and superior structural stability.

1.2 Premium Vertical-Fibre Rock Wool Core with Modified Crack-Resistant Render System – Stable Construction, Water-Swelling Resistance & Long-Term Weathering Performance

The core substrate is high-purity basalt vertical-fibre rock wool. Fibres are regularly aligned vertically, differing from standard horizontal-fibre rock wool. The compact fibre matrix delivers enhanced compressive, tensile and pull-out strength. This physical configuration substantially mitigates risks of water-induced swelling, delamination and dimensional shrinkage.

The vertical fibre arrangement effectively counteracts thermal differential stress, minor substrate movement and wind pressure loads acting on the façade. Panels retain their form over long service life without deformation, slackening or powdering. The surface is laminated with custom modified polymer-modified crack-resistant render. Its optimised formulation delivers high bond strength, flexible crack resistance and outstanding hydrophobic performance, blocking rainwater and moisture penetration into the core. This prevents rock wool moisture saturation, thermal performance degradation and mould deterioration.

The render facing also exhibits excellent ageing and freeze-thaw resistance, resisting damage from rain impact, wet-dry cycling and wide temperature fluctuations. The panel maintains structural stability under service conditions, acting as a reliable base substrate for subsequent decorative finishes within thin-coat render external insulation systems, ensuring robust overall system stability.

2. Eight Key Performance Properties

2.1 Euroclass A1 Non-Combustible for Demanding Fire Engineering

Manufactured entirely from inorganic raw materials, achieving Euroclass A1 non-combustible classification. It will not melt, drip or release toxic fumes at temperatures up to 800℃, effectively restricting vertical fire spread. Suitable for high-rise residential blocks, office towers, hospitals, schools and other public and residential buildings subject to stringent fire requirements, meeting mandatory fire performance criteria for external façade assemblies.

2.2 Efficient Thermal Insulation, Reduced Building Energy Consumption

Thanks to the rock wool’s closed porous fibre structure, stationary air is trapped for effective thermal resistance. Declared thermal conductivity λ ≤ 0.046 W/(m·K). It retains indoor heat during winter and blocks external heat ingress in summer, stabilising indoor temperatures year-round. Heating and cooling energy consumption can be cut by over 30%, ideal for energy retrofits and new-build external wall insulation projects in cold northern regions.

2.3 High Hydrophobicity & Water Penetration Resistance, Preventing Insulation Failure from Moisture Infiltration

The panel achieves a total water repellency ≥98%. Excellent moisture repellent and anti-capillary properties prevent rain and ambient moisture penetrating the rock wool core. It eliminates recurring issues of conventional rock wool such as water clumping, progressive thermal performance loss and powdering from dampness. Dimensions remain stable under seasonal temperature cycling and prolonged rain exposure, suitable for wet and exposed service environments with high rainfall.

2.4 High Crack & Impact Resistance, Service Life Matched to Building Fabric

The high-strength cement render facing offers strong compressive, tensile and impact resistance, defending the façade against knocks and mechanical damage. The fully inorganic composite has a very low coefficient of thermal expansion, resisting cracking, hollowing and delamination over decades, with a service life compatible with the main building structure.

2.5 Porous Acoustic Absorption, Improved Indoor Environmental Comfort

The natural porous fibre matrix of rock wool delivers effective sound absorption and vibration damping. It absorbs and attenuates traffic noise, ambient sound and mechanical vibration transmission, markedly improving quietness within roadside buildings, site offices and mixed-use residential developments, combining thermal and acoustic functions.

2.6 Uniform Dimensions, Easy On-Site Cutting, Suited to Complex Substrate Profiles

Panels are uniformly formed with consistent density and low self-weight, simple to handle and fix to walls. They can be accurately trimmed on site to suit wall dimensions, readily fitted around beams, columns, internal and external corners, bay windows and curved substrates. Excellent substrate contact ensures broad application scope, minimising cutting wastage and preserving the integrity of the external insulation assembly.

2.7 Environmentally Safe, Non-Hazardous

Made from natural basalt mineral fibre. Free from formaldehyde, volatile organic compounds and asbestos. Manufactured with environmentally controlled processes, non-toxic and odourless, safe for use on public, residential and internal / external renovation projects.

2.8 Good Movement Accommodation for Minor Building Displacements

The panel possesses good overall flexural toughness, accommodating minor vibration and structural movement of the building. It reduces risks of cracking and detachment caused by slight substrate deformation, offering stable performance across diverse building applications.

3. Core Construction Benefits

The principal advantage of Haochen Precast Render-Coated External Wall Rock Wool Panel: factory pre-curing of the base render layer removes labour-intensive base rendering and multi-stage levelling operations on site. It is not fully render-free.

Traditional bare rock wool external insulation strictly follows the two-mesh three-coat thin render process, requiring repeated mesh embedding, render application and levelling. This consumes large quantities of auxiliary materials and labour, and final quality heavily depends on installers’ experience, commonly leading to hollowing, cracking, poor flatness and render delamination.

Our product completes the composite curing of rock wool core and base render under factory standardised production, delivering dense, uniform panels with consistent strength and reliable quality. On site, after adhesive bonding and mechanical fixing of the panels, a continuous reinforcing mesh is embedded and finished with one layer of top crack-resistant render to complete the full insulation and render system.

On-site working procedures are drastically reduced, cutting site programme durations by over 70%. This generates substantial savings on labour, scaffolding and render materials. Factory prefabrication eliminates quality variation arising from multi-coat manual site rendering. The panels arrive with high inherent surface flatness and stable system performance, delivering higher first-pass acceptance rates. It is the preferred efficient insulation panel for new external wall projects and existing residential energy retrofits.

4. Application Range

1. Residential Buildings: External thermal insulation and fire protection works for high-rise housing, mixed-use estates, hotels, office blocks, schools and hospitals.

2. Industrial Buildings: External wall insulation, fire protection and weatherproof cladding for steel-framed factories, warehouses, workshops and associated site buildings.

3. Energy Retrofit Works: Thermal upgrading of external walls on aged residential blocks, removal and replacement of old insulation systems and façade refurbishment projects.

4. Ancillary Insulation Systems: Standard thin-coat render ETICS, cavity insulation behind curtain walling, non-exposed roof insulation and fire-resistant acoustic partitions for internal walls.

5. Manufacturer Capability & Service Provisions

Haochen Insulation has specialised in external wall fire-resistant thermal insulation materials for many years, operating as a vertically integrated manufacturer undertaking R&D, production, custom fabrication and project supply. We focus on the standardised production and process optimisation of Euroclass A1 fire-rated external wall insulation panels.

The facility is equipped with large-scale automated production lines with mature manufacturing techniques and a comprehensive quality control regime. From raw material selection, panel composite forming, curing inspection through to finished product dispatch, all stages are managed under standardised controls to guarantee consistent quality of construction-grade insulation panels. With ample production capacity, we support bulk supply for small, medium and large external wall insulation projects.

✅ Direct from Manufacturer, No Intermediary Mark-UpFully owned production plant and equipment, all goods manufactured in-house without multi-layer distributor surcharges. Bulk project purchasing delivers outstanding cost performance. Ample stock and stable production capacity enable fast despatch, catering to tight construction deadlines and urgent project deliveries.

✅ Full-Size Custom Fabrication to Construction DrawingsCustom thicknesses from 30mm up to 180mm, plus standard and special density options. Non-standard and profiled panels can be fabricated in accordance with construction drawings and site conditions. Flexible customisation suits new housing developments, industrial plants, retrofits and façades with complex geometries.

✅ One-Stop Technical Support, Risk-Free Project DeliveryA dedicated technical team provides pre-project condition assessment, panel selection and scheme optimisation. During production, we monitor manufacturing progress, quality assurance and delivery schedules. Post-delivery support includes on-site installation guidance, technical enquiries and project follow-up. Dedicated one-to-one communication helps avoid common installation pitfalls.

With factory integrated prefabrication, simplified installation, structural stability, crack and weather resistance, fire and moisture resistance alongside time and cost savings, Haochen Precast Render-Coated External Wall Rock Wool Panel is widely adopted on new-build external façades and energy retrofit schemes, recognised as a cost-effective, dependable Euroclass A1 insulation panel. All products undergo factory quality inspection. Samples can be supplied for third-party sampling testing. Bulk supply and custom fabrication are available year-round.