Meta description: For South Korean old apartment facade renovation, commercial building facade renewal and Green Remodeling (그린리모델링) scenarios, we provide Flexible Stone (MCM / Soft Stone / 소프트스톤) system solutions covering KS F ISO 5660-1 / KS F 2271 quasi-non-combustible (준불연) certification, KDS 41 12 00 wind load and typhoon cladding fall-off prevention design, GR certification and green building incentive alignment, and Korean-localized delivery pathways.
Keywords: South Korea flexible stone, Flexible Stone, MCM, 소프트스톤, 준불연, KS F ISO 5660-1, KDS 41 12 00, 그린리모델링, GR 인증, typhoon exterior cladding fall-off
Quick Answer: What Is the South Korea Flexible Stone Market Solution?
The South Korea Flexible Stone market solution uses Flexible Stone (MCM / modified clay / Soft Stone / 소프트스톤) as the finish layer and provides an integrated solution for South Korean old apartment facade renovation, commercial building facade renewal and Green Remodeling (그린리모델링) scenarios, covering quasi-non-combustible (준불연) compliance + typhoon wind pressure safety + green building certification alignment + system delivery.
The key judgment for entering the South Korean market differs fundamentally from Europe and the US. South Korea does not require external wall materials to achieve “non-combustible (불연)”; it accepts “quasi-non-combustible (준불연)” —a statutory rating lower than non-combustible but requiring dual testing under KS F ISO 5660-1 (cone calorimeter method; total heat release within 10 minutes ≤8 MJ/m²; maximum heat release rate not exceeding 200 kW/m²) and KS F 2271 (gas toxicity test; average time to incapacitation ≥9 minutes). In September 2015, the obligation to use quasi-non-combustible/non-combustible materials on external walls was expanded from buildings of 30 storeys or more to buildings of 6 storeys or more, directly covering the vast majority of existing apartment and commercial building facade renovation scenarios in South Korea. At the same time, South Korea is a typhoon-prone country, and exterior cladding fall-off prevention design is rigidly constrained by the Ministry of Land, Infrastructure and Transport’s 《Guidelines for Preventing Fall-off of Building Exterior Cladding Caused by Strong Winds》 and the KDS 41 12 00 (2022) wind load standard. The facade damage caused by Typhoon Hinnamnor in 2022 remains an industry warning case.
Core judgment: A mature MCM category awareness already exists in the local South Korean market. The local brand Stone Kim (스톤킴) has obtained quasi-non-combustible certification for its “Soft Stone (소프트스톤)” product through recognized bodies such as KCT and has entered interior wall applications in multi-purpose and public facilities; the Chinese MCM brand (Phomi) has also established a large MCM material experience center in South Korea and developed stable agents. The first action in the South Korean market is not “educating the category”, but using quasi-non-combustible reports issued by South Korean recognized bodies (KCT/KCL, etc.) and KDS wind load calculation sheets to translate product documents from “Chinese standards” into “Korean compliance language”. Without quasi-non-combustible certification, products cannot enter the external walls of buildings of 6 storeys or more; without wind pressure and fall-off prevention verification, products cannot stand up in typhoon seasons and insurance reviews.
1. Why Does the South Korean Market Need a Flexible Stone System Solution?
The drivers of the South Korean facade market are concentrated in three lines: the mandatory threshold of fire regulations, the stock scale of old apartment renovation, and the funding leverage of Green Remodeling policy.
Driver 1: Quasi-non-combustible (준불연) is the statutory entry ticket for external walls of buildings of 6 storeys or more. South Korean building regulations classify building finishing materials by fire performance into three levels: non-combustible (불연), quasi-non-combustible (준불연), and flame-retardant (난연). External wall finishing materials in buildings of 6 storeys or more must use non-combustible or quasi-non-combustible materials; if a “fire spread prevention structure” complying with Ministry of Land, Infrastructure and Transport notice standards is installed, flame-retardant materials may be used exceptionally. The practical effect of this institutional design is: quasi-non-combustible is the realistic pathway for flexible facing materials to enter the South Korean mainstream external wall market. Although non-combustible (A1/A2 class) is a higher rating, for MCM-type organic-inorganic composite materials, the feasibility of achieving quasi-non-combustible is far higher than achieving pure non-combustibility. Stone Kim’s Soft Stone has obtained quasi-non-combustible certification through KCT and entered public facility interior walls, proving that this pathway works locally in South Korea.
Driver 2: The stock market for old apartment facade renovation is counted in hundreds of billions of KRW and is accelerating. In 2025, South Korea’s national repainting (재도장) project announcements totaled about 2,500 cases, a year-on-year increase of more than 25%. The repainting coatings market alone is about KRW 120 billion and continues to grow annually. This does not yet include the larger scope of exterior insulation, waterproofing and facing system renewal. South Korean housing is dominated by apartments (아파트), and a large number of apartments built in the 1990s–2000s are entering the window for overall exterior wall system renewal. The opportunity for flexible stone in this market is not to replace coatings for “repainting”, but to replace heavy traditional tile or stone solutions with a combination of quasi-non-combustible + lightweight + fast installation in projects where the exterior wall needs “reskinning + functional upgrading”.
Driver 3: Green Remodeling (그린리모델링) policy brings exterior wall renewal into a funding support framework. In August 2026, the South Korean National Assembly passed an amendment to the 《Green Building Construction Support Act》, explicitly providing diverse support instruments such as subsidies, financing or interest reduction, and consulting for green remodeling of private buildings, while green remodeling of public buildings is moving toward obligation. Previously, the interest support rate for private building green remodeling had been raised from a baseline of 4% to 4.5%–5.5%, with a maximum single loan of KRW 20 billion, on the condition that at least one required technical element such as high-performance windows or exterior wall insulation must be included. As part of the exterior wall facing system, Flexible Stone can be designed in coordination with exterior insulation systems, enabling projects to meet the technical element requirements of green remodeling and thereby access interest rate benefits and subsidies.
2. Our South Korea Market Solution Architecture
1. Compliance Pathway: Quasi-Non-Combustible Is the Threshold; KS Standards Are the Language
| Compliance Level | South Korean Market Requirement | Current Basis and Gap | Recommended Action |
|---|---|---|---|
| Quasi-non-combustible (준불연) | KS F ISO 5660-1: total heat release within 10 minutes ≤8 MJ/m²; maximum heat release rate not exceeding 200 kW/m² continuously for 10 seconds or more; no through-cracks/holes. KS F 2271: gas toxicity test average time to incapacitation ≥9 minutes | Existing GB 8624 A2-s1,d0 can serve as supporting evidence for material non-combustibility, but cannot automatically be equated with South Korean quasi-non-combustible certification | Commission South Korean recognized bodies such as KCT and KCL to issue quasi-non-combustible test reports under KS standards; or conduct technical equivalence assessment based on existing data and supplement with South Korean testing |
| External wall scope of application | External walls of buildings of 6 storeys or more must use non-combustible or quasi-non-combustible materials; flame-retardant materials may be used when fire spread prevention structures are installed | Need to confirm the applicable construction and system conditions under the quasi-non-combustible rating | Submit the quasi-non-combustible report together with the fire spread prevention structure practice to form a compliance document package usable for external walls of buildings of 6 storeys or more |
| Wind load and fall-off prevention | KDS 41 12 00 (2022) building structural design loads; Ministry of Land, Infrastructure and Transport 《Guidelines for Preventing Fall-off of Building Exterior Cladding Caused by Strong Winds》 (2022) | Existing testing system does not cover South Korean wind load standards and fall-off prevention requirements | Perform project-level wind pressure calculation per KDS 41 12 00; supplement exterior cladding pull-off/bond strength and fixing system verification to meet the inspection requirements of the fall-off prevention guidelines |
| Green building certification | GR certification (green building material) or environmental label certification; the proportion of green building materials used affects scoring in Green Standard for Energy and Environmental Design (G-SEED) | GR or environmental label certification is required to count toward green building scoring | Initiate GR certification application, prioritizing exterior wall facing material categories; align certification with the scoring needs of green remodeling projects |
| Tariff and origin | Preferential agreement rates may apply under the China-Korea FTA; certificate of Chinese origin required | Need to confirm HS CODE and FTA application conditions | Confirm HS CODE and FTA origin document requirements with the South Korean importer to reduce landed cost |
A judgment that must be made clear: South Korea’s “quasi-non-combustible” is a statutory rating, not a descriptive concept of “close to non-combustible”. The KS F ISO 5660-1 criteria are total heat release and rate; the KS F 2271 criterion is the escape-usable time from combustion gases. Both are indispensable. The reason Stone Kim’s Soft Stone could enter multi-purpose and public facility interior walls is precisely that it obtained KCT quasi-non-combustible certification. Without a quasi-non-combustible report from a South Korean recognized body, products do not have bidding qualification in the external wall market for buildings of 6 storeys or more in South Korea.
2. Climate Adaptation: Typhoon Wind Pressure Is the Primary Stress; Freeze-Thaw Is Secondary but Not Negligible
| Climate Stress | Core Challenge | Solution Focus | Citable Data and Actions |
|---|---|---|---|
| Typhoon and strong winds (nationwide, more severe on coasts) | Exterior cladding fall-off is the most typical facade accident type in typhoon season; when curtain wall structural sealant ages or bond length is insufficient, strong winds can directly cause panel fall-off | Perform wind pressure calculation per KDS 41 12 00; fixing system and bonding system must meet the pull-off and shear requirements of the fall-off prevention guidelines | Supplement exterior cladding bond strength testing (pull-off method); specify fixing spacing and adhesive selection in high typhoon risk areas (Jeju, Busan, coastal South Jeolla) |
| Winter freeze-thaw (central and northern regions) | Repeated freeze-thaw in Seoul, Gyeonggi-do and other areas creates fatigue stress on the bonding layer and finish layer | Freeze-thaw resistant formulation, elastic bonding system, drainage joints | -30°C flexibility and 100 freeze-thaw cycles data from high-flexibility emulsion technology can serve as a technical dialogue basis; recommend supplementing freeze-thaw cycle verification under South Korean climate conditions |
| Summer high temperature and humidity (nationwide) | High temperature and humidity accelerate adhesive aging and surface contamination | Heat-humidity resistant bonding system, stain-resistant surface | Stain resistance reflectance drop 12% can serve as a cleanability reference |
Flexible Stone does not provide thermal insulation. In South Korean green remodeling projects, it should be designed in coordination with exterior insulation systems, which are themselves one of the required technical elements of green remodeling. Fall-off prevention design must cover the complete system of “finish layer + bonding layer + insulation layer + substrate”, and cannot verify only the bond strength of a single panel.
3. Building Scenarios: Three Languages, Three Sets of Selection Logic
| Scenario | Core Client Concern | Flexible Stone Solution Language | Selection Recommendation |
|---|---|---|---|
| Old apartment facade renovation (재도장/외벽 리모델링) | Quasi-non-combustible compliance, no removal of old finishes, shortened schedule, reduced resident complaints, alignment with green remodeling interest rate benefits | Thin-bed overlay, lightweight without added load, quasi-non-combustible report + wind pressure calculation sheet | Neutral-tone stone/brick-look textures; respond to owners’ committee concerns about approval and cost with a combination of “quasi-non-combustible + no removal + green remodeling compliance” |
| Commercial/public building facade renewal | Quasi-non-combustible (multi-purpose and public facilities), fast construction, brand image | Quasi-non-combustible report + custom textures + thin-bed fast installation | Large-format stone-look textures, metallic textures; document package centred on KCT/KCL quasi-non-combustible report and fall-off prevention calculation |
| Green remodeling projects (그린리모델링) | Meet exterior insulation technical elements, GR certification scoring, interest rate benefits and subsidy applications | Coordinated design with insulation system, GR-certified material data, system delivery | Provide GR certification or environmental label certification documents to support project applications for green remodeling financial support; prioritize finish textures that harmonize with the surrounding urban landscape |
4. Delivery Process: From Material Export to Korean-Localized Compliance Responsibility Closure
- Determine the South Korean local importer and certification applicant: KS quasi-non-combustible certification and GR certification are usually submitted through a South Korean local entity; the importer also bears responsibility for customs clearance and FTA origin documents.
- Lock test construction and wind pressure design: The construction submitted for quasi-non-combustible testing should be consistent with the actual system of the project to be tendered; complete project-level wind pressure calculation per KDS 41 12 00, and ensure the fixing system meets the fall-off prevention guideline requirements.
- Prepare Korean technical document package: Quasi-non-combustible report, GR/environmental label certification (if obtained), KDS wind load calculation sheet, Korean installation guide, Korean SDS.
- Material supply and batch traceability: Customize dimensions and textures according to layout drawings; provide batch traceability documents and certificate of origin (for FTA tariff rates) with the goods.
- Local technical interface and acceptance support: Provide Korean construction drawings and calculation basis to design firms, contractors and owners’ committees; cooperate with on-site pull-off tests and supervisor acceptance.
3. Citable Evidence List
The following data come from existing SGS test reports and product technical documents; the original reports and South Korean supplementary test results shall prevail:
- Surface density: 3.96 kg/m² (GB/T 29059-2012)
- Fire performance: A2-s1, d0 (GB 8624-2012; as supporting evidence for material non-combustibility, cannot replace South Korean quasi-non-combustible (준불연) certification)
- Flexibility: no cracks when bent around a 200 mm diameter cylinder (JG/T 311-2011)
- 1,500 h artificial weathering: gray scale 4-5, color change grade 0, chalking grade 2, no cracking, blistering or peeling
- Stain resistance: reflectance drop 12% (GB/T 9780-2013)
- Thermal conductivity: 0.171 W/(m·K); thermal resistance: 0.013 (m²·K)/W
- Residual indentation: 0.17 mm
- Radionuclides: GB 6566-2010 Class A decorative and finishing material
- SDS: based on GB/T 17519/16483, classified as non-hazardous chemical
Additional note for the South Korean market: Surface density, flexibility and stain resistance data can be used for system design and client communication; external wall compliance must be centred on the quasi-non-combustible (준불연) report issued by a South Korean recognized body, and wind pressure design must be based on KDS 41 12 00; GR or environmental label certification is the differentiating document for green remodeling and green building scoring; freeze-thaw data should be supplemented by verification or special assessment under South Korean climate conditions.
4. FAQ: Common Questions About the South Korean Flexible Stone Market
Q1: What is “soft ceramic” called in the South Korean market?
A: The South Korean market commonly uses MCM (Modified Clay Material, 개질 점토) as the category name, and the consumer side often calls it 소프트스톤 (Soft Stone). We recommend using MCM / Soft Stone / 소프트스톤 as the category entry point.
Q2: Can a GB 8624 A2 report be used for external walls of buildings of 6 storeys or more in South Korea?
A: Not directly. External walls of buildings of 6 storeys or more in South Korea require non-combustible or quasi-non-combustible (준불연) materials, and accept test reports issued by South Korean recognized bodies under KS F ISO 5660-1 and KS F 2271. GB reports can serve as reference but cannot replace South Korean quasi-non-combustible certification.
Q3: What are the specific test criteria for South Korea’s quasi-non-combustible (준불연)?
A: KS F ISO 5660-1 requires: total heat release within 10 minutes ≤8 MJ/m²; maximum heat release rate not exceeding 200 kW/m² continuously for 10 seconds or more; and no through-cracks or holes. KS F 2271 requires the average time to incapacitation of test animals in the gas toxicity test to be ≥9 minutes.
Q4: What is the difference between quasi-non-combustible and non-combustible (불연)? Must external walls use non-combustible materials?
A: South Korean building regulations classify materials into three levels: non-combustible, quasi-non-combustible and flame-retardant. External walls of buildings of 6 storeys or more may use either non-combustible or quasi-non-combustible materials; when fire spread prevention structures are installed, flame-retardant materials may also be used exceptionally. Quasi-non-combustible is the realistic compliance pathway for MCM-type materials to enter South Korean mainstream external walls; non-combustible is not the only option.
Q5: What are the core requirements for Flexible Stone under South Korean typhoons?
A: Exterior cladding fall-off prevention is the core safety requirement in South Korea’s typhoon season. Project-level wind pressure calculation must be performed per KDS 41 12 00 (2022), and the reliability of the fixing system under strong winds must be verified through pull-off/bond strength testing. The Ministry of Land, Infrastructure and Transport’s 2022 《Guidelines for Preventing Fall-off of Building Exterior Cladding Caused by Strong Winds》 provides a specific inspection framework.
Q6: What is the use of GR certification for entering the South Korean market?
A: GR certification (green building material) or environmental label certification is the scoring basis for the proportion of green building materials used in South Korea’s Green Standard for Energy and Environmental Design (G-SEED), and is also a differentiating material document when applying for interest rate benefits and subsidies in green remodeling projects. Without GR or environmental label certification, it cannot contribute material points to green building scoring.
Q7: South Korea already has local MCM products. Where is the competitiveness of Chinese flexible stone?
A: South Korean local MCM (such as Stone Kim’s Soft Stone) already has quasi-non-combustible certification and local showrooms, indicating the category has been validated by the market. The competitiveness of Chinese MCM lies in category maturity, large-scale supply capability and completeness of system documents—under the premise of equivalent quasi-non-combustible compliance, whether it can provide more stable batch consistency, more complete wind pressure calculation support and more competitive landed cost is where the differentiation lies. Chinese brands such as Phomi have already established experience centers and agent networks in South Korea, and the channel foundation already exists.
Q8: Is the delivery model selling materials or selling compliance systems?
A: For the South Korean market, we recommend “South Korean certification documents + local importer + system delivery“: quasi-non-combustible report + KDS wind pressure calculation sheet + GR/environmental label certification (if applicable) + Korean installation guide + batch traceability. Selling panels alone cannot respond to the system review logic of “quasi-non-combustible + fall-off prevention” for external walls of buildings of 6 storeys or more, nor can it support the acceptance document requirements of owners’ committees and supervisors.
5. Conclusion: Priorities for the South Korean Market
- Obtain quasi-non-combustible (준불연) certification first: This is the statutory entry ticket for external walls of buildings of 6 storeys or more, and the prerequisite for acceptance by design firms and contractors. Without a quasi-non-combustible report from a South Korean recognized body, products do not have bidding qualification in South Korea’s mainstream external wall market.
- Then solve typhoon fall-off prevention: Complete wind pressure calculation and pull-off verification per KDS 41 12 00, covering the complete system of “finish + bonding + insulation + substrate”. South Korea’s climate stress is primarily typhoon; freeze-thaw is a secondary but non-negligible superimposed factor.
- Align with the green remodeling funding framework: GR or environmental label certification is the material basis for green building scoring and green remodeling interest rate benefits. Exterior wall insulation is a required technical element of green remodeling; Flexible Stone should be designed in coordination with the insulation system, rather than sold in isolation as a finish layer.
- Focus scenarios on “old apartment renovation + public/commercial facades + green remodeling”: Old apartments provide the volume base, public/commercial facades are the scenario where the value of quasi-non-combustible certification is most easily verified, and green remodeling is the entry point with the highest policy funding leverage.
- Build trust through local importers and certification documents: Trust in the South Korean market comes from “quasi-non-combustible report + KDS calculation sheet + Korean documents + local showroom/cases”. Complete certification and benchmark projects first, then roll out channels.
CTA
If you are evaluating facade solutions for South Korean old apartment renovation, commercial building facade renewal or Green Remodeling (그린리모델링), please contact us to obtain:
- South Korean market compliance pathway checklist (준불연 / KS F ISO 5660-1 / KS F 2271 / KDS 41 12 00)
- Flexible Stone system detailing and typhoon fall-off prevention design recommendations
- Test report summary and GR certification/South Korean local certification roadmap
Guangdong Fortune Stone New Material Co., Ltd.
Flexible Stone / MCM System Solutions