Explore our engineering-grade custom entrance, interior, and security door models certified for global markets.
Zhejiang Larsom Door Co., Ltd. is a leading manufacturer specializing in the advanced research, development, production, and international distribution of high-performance architectural systems. Our product portfolio includes premium-engineered security doors, architectural armored doors, composite wood-steel partitions, and highly customized entrance systems.
We operate a modernized manufacturing facility spanning over 16,000 square meters, utilizing robotic manufacturing and state-of-the-art precision machinery. With 160+ certified engineering and manufacturing specialists, our daily production capability exceeds 200 sets of architectural-grade doors, ensuring high-volume orders are completed with uncompromised dimensional consistency.
"Guided by the philosophy of 'Quality First, Customer Foremost, Innovation for the Future', Larsom Door delivers reliable structural integrity and architectural solutions across 130+ countries."
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An architectural analysis of material density, acoustic isolation, and structural load-bearing parameters.
Bi-fold doors represent a complex spatial design challenge in modern construction. Unlike standard swing doors, bi-fold systems utilize track assemblies that suspend or guide multiple hinges across a central axis. Under constant motion, the structural stability of the panel core determines the lifespan of the entire system.
Our solid core bi-fold panels utilize a high-density composite matrix comprised of cross-laminated timber (CLT) stiles and rails combined with an engineered particleboard or mineral-core center. By balancing moisture levels within our raw materials to a strict 8% to 12%, we minimize internal stress. This prevents standard wood warping or bowing, a defect common in inferior hollow-core doors that leads to binding inside track pathways.
Multi-layered cross-laminated framework compensates for directional wood fiber expansion, preventing structural deformation.
Solid dense centers achieve sound transmission class (STC) ratings up to 38dB, ideal for partitioning noisy residential areas.
Low U-value metrics provide effective barrier barriers, enhancing HVAC zoning control and saving overall building energy.
In luxury multi-family apartments and hospitality projects, space-saving layouts require high acoustic insulation. A solid core bi-fold door acts as a dense physical block that prevents sound waves from passing through. Our engineers integrate heavy-density MDF skins (ranging from 750kg/m³ to 850kg/m³) over structural mineral cores, creating an effective acoustic barrier.
Additionally, the gap between the door edge and the frame presents a potential pathway for sound transmission. To address this issue, our systems are pre-engineered to accept integrated drop seals and high-durability neoprene compression gaskets. This ensures that when the bi-fold panels are fully extended, they seal the opening tight, minimizing flanking noise path channels.
Explore the quality steps inside Zhejiang Larsom Door's 16,000+ sqm precision facility.
Building codes vary across international regions, making compliance a key priority for B2B buyers. For commercial applications, structural materials must pass strict fire safety and smoke protection tests.
Our manufacturing facility supports certifications across multiple regions, ensuring smooth project approval and safety compliance:
| Performance Indicator | Hollow Core Bi-fold | Engineered Solid Core (Larsom) | Fire-Rated Solid Mineral Core |
|---|---|---|---|
| Typical Weight (per m²) | 10 - 12 kg | 28 - 35 kg | 42 - 50 kg |
| Acoustic Rating (STC) | 20 - 24 dB | 32 - 38 dB | 35 - 42 dB |
| Fire Integrity Rating | Non-rated | 20 Minutes (Customized) | 60 - 90 Minutes (BS/UL Certified) |
| Deflection Resistance | Poor (High risk of warping) | Excellent (Under 1.5mm deflection) | Maximum Stability (Near zero deflection) |
| Impact Resistance | Low (Easily dented) | High Structural Strength | Industrial Grade Heavy Duty |
Sourcing solid core doors from China offers significant advantages in scale, logistics, and cost efficiency. The industrial cluster in Zhejiang province provides direct access to premium timber mills, automated steel processing, chemical adhesive systems, and hardware manufacturers. This allows us to secure reliable raw materials at stable pricing.
At Larsom Door, our vertical integration enables us to control the entire manufacturing process in-house—from initial shearing and CNC bending to final UV coating. This eliminates the markups from outsourcing, allowing us to offer highly competitive pricing. These savings help international B2B buyers lower their total procurement costs while maintaining high product quality.
How global developers integrate solid core bi-fold panels to optimize modern spatial environments.
Used to divide master suites and walk-in dressing rooms. Real walnut and oak veneers provide a premium aesthetic that matches high-end custom millwork.
Enables hotels to quickly partition large suites into smaller guest zones. High-density acoustic cores ensure privacy and quiet between adjacent rooms.
Creates flexible meeting rooms. Panels fold back neatly to open up workspaces, or close securely to maintain privacy during confidential meetings.
A premium bi-fold system relies heavily on the quality of its hardware. Without heavy-duty tracks, pivots, and hinges, even the most durable door panel will sag or fail under daily use.
Larsom Door works with leading architectural hardware manufacturers to provide fully integrated door packages:
Through our ODM and OEM services, we customize panels to fit non-standard openings, integrate specific glass inserts, or pre-drill for specialized locksets. This helps reduce installation time and labor costs on the job site.
Ensuring safe transit, minimal damage, and reliable delivery for global construction projects.
All solid core panels are wrapped in protective PE foam, reinforced with corner guards, and packed into IPPC-certified wooden crates to prevent damage during sea transit.
Solid core doors are heavy, meaning shipping costs can rise quickly without smart packing. Larsom's logistics team plans every container layout to maximize space. We combine different panel sizes to fill the container, preventing shifting during transit and lowering shipping costs per unit.
We handle all export clearances from Ningbo and Shanghai ports, providing complete shipping documentation (Bill of Lading, Certificate of Origin, Phytosanitary Certificates, and Packing Lists) to ensure smooth customs clearance in destination ports.
Expert answers to common procurement questions from architects, contractors, and global buyers.
Solid core bi-fold doors are filled with dense wood composite or mineral materials, which prevents the panels from warping under moisture changes. They also offer much better sound insulation (STC ratings of 32-38dB) and can be customized with fire-rated cores, making them suitable for commercial projects.
We dry all raw materials in computerized kilns to reach a stable moisture content of 8% to 12%. We also use cross-laminated construction, which balances internal wood tension and ensures the door panels stay flat over time.
Yes, we can customize our doors with mineral cores to meet fire ratings from 20 to 90 minutes. These configurations comply with international standards like UL 10C, ASTM, and BS EN 1634.
For custom veneer finishes, hardware prep, or non-standard sizes, our standard MOQ is 50 sets. This allows us to calibrate our CNC machinery efficiently and offer competitive pricing. For larger ongoing projects, we can adjust these requirements.
We can supply complete doorsets, including the panels, frames, matching hardware (heavy-duty top-hung tracks, rollers, concealed hinges, drop seals), and locksets. We also offer pre-milled panels if you prefer to source your own hardware.
We design our doors with heavy-duty top-hung track systems and multi-wheel ball-bearing carriers. We also reinforce the top rails with solid timber structures to ensure they can hold the weight of dense solid core panels under daily use.
Production typically takes 30 to 45 days after the shop drawings are approved and the deposit is received. The total timeline will vary depending on customization requirements, material availability, and current production schedules.
Yes, we prioritize sustainable sourcing. Our timber materials can be certified to meet international environmental regulations, ensuring compliance with local green building standards.
Explore our premium entrance systems, armored security doors, and customized wood-engineered designs.
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