Manager：Ammi
WhatsApp：+8618935125981
Phone：+8613258668896
Email：info@zd-prefab-house.com
Feedback
Date：2026-01-08 Views：126
Q1: What processes should the quality acceptance of China prefab home modular houses cover? How many categories are the core indicators divided into? What special requirements need to be met?
A: Quality inspection covers the entire process of factory prefabrication, transportation, hoisting, and on-site installation of China prefab house. We divide the core indicators into six categories, and China prefab house must comply with the special specifications of the target market. For example, Russia sets strict thermal insulation and fire protection requirements forChina prefab house, while the EU enforces CE certification standards.
Q2: As the core of the core, what specific contents does the China prefab home structural safety indicator include?
A: The structural safety indicator determines the load-bearing capacity and durability of China prefabricated house, mainly including two aspects. First, steel structure performance: We adopt G550 steel for the main structure of China prefabricated house; this steel has a yield strength of ≥ 550MPa and must meet relevant tensile strength standards. Meanwhile, workers must ensure strong and firm welding/bolt connections, avoid cracks or porosity in welds, control bolt torque to the standard value, and guarantee the pull-out force complies with design requirements.
Second, Anti-corrosion Coating Requirements
Anti-corrosion coatings for China prefabricated house require sufficient thickness and adhesion. For instance, we control the thickness of hot-dip galvanized layers to ≥ 85μm and fluorocarbon paint films to ≥ 120μm, and ensure adhesion tests reach ≥ Grade 1.
Third, Overall Load-bearing Capacity Requirements
Additionally, overall load-bearing capacity is crucial. We conduct uniform load tests (such as roof snow load and floor live load) on the building; roofs and floors should show no obvious deformation or cracks under these tests. We also test walls and roofs against the wind load level of the target area, and they must not warp or deform. Moreover, for seismic fortification areas, the building must meet the deformation and load-bearing requirements corresponding to the specified seismic grade.
Q3: The China prefab home enclosure performance index is related to building functions such as thermal insulation, waterproofing, and sound insulation. What are the specific requirements?
Thermal Insulation Performance Requirements
A: The enclosure performance indicator has clear specific requirements. Regarding thermal insulation performance, the heat transfer coefficient (K value) of walls, roofs, and floors of China modular house must comply with local energy-saving specifications. For example, Russia’s severe cold regions require a K value ≤ 0.15 W/(㎡·K). Besides, we need to ensure that light steel keels, door and window frames, and other areas of China modular house have no obvious thermal bridges, and their surface temperatures are higher than the dew point.
Waterproof and Sealing Performance Requirements
For waterproof and sealing performance, we conduct 2-hour continuous water spraying tests on roofs and exterior walls of China modular house, and these parts must show no leakage. We focus particularly on door and window joints and their surroundings during the tests. Meanwhile, we control the ground’s moisture content to ≤ 6% to avoid moisture regain or mold growth.
Sound Insulation Performance Requirements
In terms of sound insulation performance, partition walls’ air-borne sound insulation should be ≥ 45dB, exterior walls’ ≥ 40dB, and floors’ impact sound insulation ≥ 65dB. These standards meet residential and office use requirements.
Q4: What acceptance requirements for supporting functions are included in the China prefab home functional integrity indicator?
Door and Window System Requirements
A: The functional integrity indicator covers supporting functions such as water and electricity, doors and windows, and interior decoration of China modular homes. For the door and window system, the air tightness, water tightness, and wind pressure resistance classification of China modular homes must meet design requirements. For example, we require external windows’ air tightness to be ≥ Grade 6. Furthermore, we ensure doors and windows open smoothly, their sealing strips do not fall off, and their hardware is firm.
Water and Electricity Installation Requirements
For water and electricity installation, we require the electrical system of China modular homes to have an insulation resistance of ≥ 1MΩ and a grounding resistance of ≤ 4Ω. We also standardize the wiring to avoid short circuits or leakage. In addition, we test water supply and drainage pipes for leakage; they must pass the water pressure test and ensure smooth drainage without backflow.
Interior Decoration and Equipment Requirements
For interior decoration and equipment, walls, floors, and ceilings must meet flatness and verticality standards; the wall flatness deviation should be ≤ 3mm/2m. Besides, we ensure supporting equipment such as air conditioners and pipes are installed firmly, and we test water and electricity supply to ensure normal operation.
Q5: The China prefab home dimensional accuracy indicator is crucial for the splicing and installation adaptability of modules. What are the specific deviation requirements?
Single Module Dimensional Deviation Requirements
A: The dimensional accuracy indicator has detailed deviation requirements. For single module dimensional deviation of China prefab house, the deviation of length, width, and height must be ≤ ±5mm, and the diagonal deviation ≤ ±8mm. Meanwhile, the wall verticality deviation should be ≤ 3mm/2m, and the roof slope must meet design requirements.
Module Splicing Accuracy Requirements
For splicing accuracy, the width deviation of module splicing seams of China prefab house should be ≤ ±2mm, and the overall flatness after splicing ≤ 5mm/2m. Moreover, the position deviation of reserved openings and embedded parts must be ≤ ±3mm; this ensures accurate alignment during on-site installation ofChina prefab house.
Q6: Special acceptance indicators need to be supplemented according to the target market and usage scenarios. What specific contents do they include?
Fire Protection Performance Requirements
A: Special acceptance indicators vary by target market and usage scenarios of China prefabricated house. First, in terms of fire protection performance, the combustion performance grade of materials used in China prefabricated house must comply with the target country’s standards, such as EU A2-s1,d0 and Russia G1/G2. Additionally, components of China prefabricated house should meet fire resistance limit standards; for example, walls and floor slabs with R30 need to pass fire resistance tests.
Environmental Protection Performance Requirements
Second, regarding environmental protection performance, indoor harmful gas content such as formaldehyde and VOC must comply with China’s national standard GB 50325 or the target country’s standards, such as EU E1 grade.
Durability Requirements for Special Environments
Third, in terms of durability, special environments like coastal high-salt areas and extreme cold regions require coatings and sealants to pass accelerated aging tests. This ensures they meet weather resistance requirements.
Q7: What is the core principle of the quality acceptance of China prefab home modular houses?
A: The quality acceptance ofChina modular house follows three core principles. First, we focus mainly on factory acceptance and supplement it with on-site acceptance; we should identify and solve over 80% of quality problems of China modular house during the factory prefabrication stage. Second, we implement full-process traceability: We must record each indicator’s acceptance results of China modular house in writing, and attach supporting materials such as inspection reports and photos. Third, we adhere to compliance with target market specifications: Export projects need to additionally meet local product certification and acceptance standards, such as Russia’s GOST certification and the EU’s CE certification.
Q8: What costs are included in the unit price of the product?
A: The unit price of China modular homes includes building material costs, but we do not provide a specific breakdown for other cost components. Besides, customization requirements and transportation distances will affect the quotation for China modular homes.
Q9: Is there a discount for bulk purchases? What is the discount threshold?
A: Bulk purchases qualify for tiered discounts, with thresholds set at 5 units, 10 units, and 20 units. The larger the purchase volume, the greater the discount we offer.
Q10: What is the payment method?
A: The payment method requires a 50% advance deposit, and the buyer must settle the remaining 50% balance later.
Q11: How long is the validity period of the quotation? Can the price be adjusted when the market price of raw materials rises?
A: The quotation’s validity period is 20 days. We have not specified whether the price can be adjusted in response to rising raw material market prices.
Q12: What detailed contents are included in the quotation?
A: The quotation provides details of building materials, but it does not specify whether it covers other items such as labor and packaging costs.
Q13: What is the standard delivery cycle?
A: The standard delivery cycle involves completing production within 45 working days after confirming the drawings.
Q14: Can the cycle be shortened for urgent orders? Is there an additional cost?
A: We have not specified whether the cycle can be shortened for urgent orders or whether additional costs apply.
Q15: What scope does the transportation service cover?
A: The company is responsible for the entire transportation process, covering services from the buyer’s country’s port to the designated location.
Q16: Is free on-site installation service provided?
A: We do not provide free on-site installation, but the company can dispatch technical instructors to assist the local construction team in completing the installation.
Q17: Is on-site operation training and guidance provided?
A: We offer on-site operation training and guidance, and technical instructors conduct these simultaneously during the construction process.
Q18: Does the product comply with local building code requirements?
A: The product complies with local building code requirements.
Q19: What is the wind resistance capacity of the product?
A: The steel structure has good overall stiffness, and with a reasonable anchoring design, it can resist typhoons of magnitude 12 and above.
Q20: What is the seismic grade of the product?
A: The product meets the magnitude 9 seismic standard.
Q21: What are the fire protection grade classification systems, common grades, core test standards, and key focus dimensions in different countries/regions?
A: The specific information is shown in the following table:
| Region | Core Classification System | Common Grades | Core Test Standards | Key Focus Dimensions |
| EU | Combustion performance (A1 is the highest): A1, A2, B, C, D, E, F; suffixes s1-s3 (smoke volume), d0-d2 (dripping), etc. | A1/A2, B-s1,d0 | EN ISO 1182 (Non-combustibility), EN 13823 (SBI Single Burning Item), EN ISO 11925-2 (Small Flame Ignition) | Smoke, dripping, toxicity |
| Russia | Material combustion performance (G grade): G1-G4; Fire hazard grade (KM grade): KM0-KM5 | G1/G2, KM0/KM1 | GOST 30244-94 (Vertical Burning), GOST 12.1.044 (Smoke Density), GOST 30402 (Flame Spread) | Smoke, corrosiveness, fire resistance limit |
| USA | Surface burning (ASTM E84/UL 723): Class A, B, C; Plastic flame retardancy (UL 94): V-0, V-1, V-2, HB | Class A, V-0 | ASTM E84, UL 94, ASTM E119/NFPA 251 (Component Fire Resistance) | Flame spread, smoke density |
| Australia | Material combustion (AS 1530): Group 1-4; Bushfire attack level (BAL): BAL-LOW to BAL-FZ | Group 1-2, BAL grade adapted | AS/NZS 3837 (Heat Release), AS 1530.4 (Fire Resistance), BAL Radiant Heat Test | Bushfire protection |
Q22: What are the key points for the selection and compliance of light steel modular houses?
Material Selection for Light Steel Modular Houses
A: Selecting and ensuring compliance of light steel modular houses involves three key points. First, for the light steel modular houses themselves, we recommend using materials with grades such as A1/A2 (EU), G1 (Russia), Class A (USA), and Group 1 (Australia) for walls and roofs. Besides, we suggest adopting G1/G2 grade flame-retardant rock wool or PU for insulation layers.
Standard Compliance for Cross-border Projects
Second, for cross-border projects, we cannot directly substitute standards from different regions. Instead, we must re-test and certify according to the target country’s standards. For example, EU A2 is not equivalent to Russia G1, and USA Class A is not equivalent to Australia Group 1.
Adaptation for Severe Cold and Fire Protection Scenarios
Third, for severe cold and fire protection scenarios in Russia and the EU, we prefer G1 grade basalt rock wool (resistant to -50℃). We also combine it with vapor barriers and air barriers to prevent condensation.
Q23: Can the size and layout of the house be customized? Are there other options without special needs?
A: We can customize the house’s size and layout. After the buyer provides demand information, professional engineers will issue a detailed quotation. If there are no special needs, the buyer can choose the basic standard model.
Q24: Can the position of doors and windows be customized and adjusted?
A: We can customize and adjust the position of doors and windows as needed.
Q25: What is the minimum order quantity for customized orders?
A: The minimum order quantity for customized orders is 1 unit.
Q26: What adaptation measures are there for low-temperature environments?
A: For low-temperature environments, the company uses thickened insulation layers for walls, roofs, and floors, selecting rigid polyurethane foam insulation layers (XPS) and rock wool boards.
Q27: What anti-corrosion treatment schemes are there for high-salt environments by the sea?
A: The company offers specific anti-corrosion treatment schemes for coastal high-salt environments.
Basic Anti-corrosion
We preferably use hot-dip galvanizing for the main structure (with a zinc layer ≥ 85μm). For secondary components, we adopt electroplating + phosphating + sealing paint.
Surface Strengthening
We spray fluorocarbon paint (with salt spray resistance ≥ 5000 hours) or polysiloxane paint on the galvanized layer. The paint film (primer + intermediate coat + topcoat) should be ≥ 120μm, and we thicken the treatment at corners.
Special Nodes
Workers fill bolt connections, splicing seams, and other parts with butyl rubber sealant. They then cover these parts with anti-corrosion tape or stainless steel cover plates.
Doors, Windows, and Sealing Systems
We select broken-bridge aluminum alloy (with surface fluorocarbon coating or powder coating) or UPVC plastic-steel for doors and windows. We use EPDM or silicone rubber for sealing strips. For glass sealing, we adopt neutral silicone weather-resistant glue; we also add a waterproof rubber strip between glass and profiles, and design a drip line on the window sill.
Auxiliary Protection
We recommend that the buyer rinse exterior walls with fresh water every 6-12 months to remove salt. They should also inspect coating integrity and touch up paint every 3-5 years. Additionally, the buyer should install drainage grooves and downspouts on exterior walls, and add a moisture-proof layer and apron slope on the ground. For exposed hardware, they should use 316 stainless steel or hot-dip galvanized passivated parts.
Q28: Is the installation of bathroom modules supported? What are the options?
A: The company supports the installation of bathroom modules, offering two options: prefabricated modules (assembled by the buyer on site) or integrated modules (fully completed upon arrival, no assembly required).
Q29: What is the overall warranty period of the product?
A: The product’s overall warranty period is 1 year.
Q30: How long is the service life of the frame structure?
A: Under normal maintenance, the G550 steel frame has a service life of over 50 years. We can perform anti-corrosion treatments such as galvanizing on the steel structure’s surface to extend its durability.
Q31: Which components are included in the warranty scope?
A: Components such as walls and doors and windows are all within the warranty scope.
Q32: How are the maintenance costs priced after the warranty period?
A: After the warranty period, we price maintenance costs on a case-by-case basis according to specific circumstances.
Q33: Does the formaldehyde emission of the product meet the standards?
A: The product’s formaldehyde emission meets relevant standards.
Q34: Can the steel structure be recycled?
A: We can 100% recycle and reuse the steel structure. This eco-friendly feature further enhances the market competitiveness of China modular house.
Manager:Ammi
Phone:
+8613258668896
+8618935125981
WhatsApp:
+8613258668896
+8618935125981
Email:info@zd-prefab-house.com
Scan and follow the official account
Scan and add friends
用QQ“扫一扫”加好友咨询