OSB Manufacturer & Supplier in China
Galaxi supplies OSB panels for construction, furniture, packaging and industrial applications, with OSB/2, OSB/3 and OSB/4 options available according to structural, moisture and load requirements.
OSB Specifications
OSB panels are available in different grades, thicknesses and edge profiles for structural construction, flooring, roofing, packaging and industrial applications.
OSB Grades Explained
Under EN 300, OSB grades are classified according to load-bearing performance and service conditions. Choosing the correct grade is essential for structural reliability and moisture exposure.
OSB/2
Structural OSB designed for load-bearing applications where the board remains in dry interior conditions.
- Interior structural applications
- Dry-zone flooring and partitions
- Furniture and industrial uses
- Packaging and general construction
OSB/3
The most widely used structural OSB grade for construction where both load-bearing performance and improved moisture resistance are required.
- Roof decking
- Wall sheathing
- Subfloor and flooring
- Timber-frame construction
OSB/4
Higher-performance OSB for demanding structural applications requiring greater strength, stiffness and load-bearing capacity.
- Heavy-duty structural flooring
- Higher load-bearing applications
- Industrial structural systems
- Demanding humid-service conditions
Oriented Strand Structure & Strength Direction
Oriented Surface Strands
Long wood strands in the outer layers are mainly aligned with the panel’s major axis, helping provide higher bending strength and stiffness in the length direction.
Cross-Oriented Core Layers
Core strands are arranged across the main direction to improve dimensional stability and support balanced structural performance through the panel.
Major & Minor Axis
OSB has directional mechanical properties. The major axis normally provides higher bending performance, while the minor axis contributes cross-panel stability.
How OSB Performs in Structural Applications
The oriented strand structure gives OSB the strength, stiffness and fastening performance required for many load-bearing construction and industrial applications.
Bending Strength
Oriented surface strands provide higher bending performance along the panel’s major axis, supporting use in roofing, flooring and structural sheathing.
Stiffness
A controlled strand orientation and density profile help the panel resist deflection under load and maintain structural stability.
Internal Bond
Strong bonding between compressed strand layers helps maintain panel integrity and resistance to internal separation.
Load-Bearing Capacity
OSB/2, OSB/3 and OSB/4 are designed for different structural and service conditions, allowing the panel grade to be matched to the required load level.
Dimensional Stability
Cross-oriented core layers help control dimensional movement and improve stability across the width of the panel.
Nail & Screw Holding
The compressed strand structure provides reliable fastening performance for timber-frame construction, sheathing and panel assembly.
Moisture Resistance & OSB Service Conditions
OSB grade selection depends on both structural requirements and the humidity conditions the panel will face during service.
Load-bearing panels for dry interior structural applications, including partitions, dry-zone flooring, furniture and industrial use.
Load-bearing panels for roof decking, wall sheathing, subfloors, flooring and timber-frame construction where improved moisture resistance is required.
Higher-performance structural panels for demanding load-bearing applications that also require reliable performance in humid service conditions.
Choose OSB by Application
OSB grade and thickness should be selected according to structural load, support spacing, service conditions and the final construction application.
Roof Decking
OSB/3 is widely used for roof decking and sheathing where structural strength and improved resistance to humid service conditions are required.
Wall Sheathing
Structural OSB provides a continuous sheathing layer for timber-frame walls, helping improve panel stiffness and structural stability.
Subfloor & Flooring
Thicker structural panels are commonly selected for subfloors and flooring where stiffness, load capacity and resistance to deflection are important.
Packaging & Industrial Use
OSB is also widely used for export crates, industrial packaging, pallets, temporary structures and other general-purpose panel applications.
Square Edge vs Tongue & Groove OSB
OSB edge profile should be selected according to installation method, joint support and the final structural application.
Square Edge
Standard straight-edge OSB is widely used where panel joints are fully supported by framing or where simple cutting and installation are preferred.
- Wall sheathing
- General roof sheathing
- Timber-frame construction
- Packaging and industrial use
Tongue & Groove
Interlocking tongue-and-groove edges create tighter panel joints and help improve alignment and load transfer in continuous floor and roof systems.
- Structural flooring
- Subfloor systems
- Roof decking
- Continuous panel installations
OSB Manufacturing & Quality Control
Galaxi works with established OSB manufacturing resources within Linyi and China’s wood-based panel supply network. Production is coordinated according to OSB grade, panel thickness, strand orientation, bonding system and final application requirements.
Strand Preparation
Selected wood is processed into long, thin strands with controlled geometry for OSB panel production.
Drying & Screening
Wood strands are dried and screened to control moisture, size distribution and production consistency.
Resin & Wax Blending
Resin and wax are applied to the strands to provide bonding strength and moisture resistance according to grade.
Strand Orientation & Mat Forming
Surface and core strands are oriented in different directions to create the characteristic layered OSB structure.
Hot Pressing & Calibration
The formed mat is hot pressed, trimmed and calibrated to reach the target thickness, density and panel stability.
Final Quality Inspection
Finished OSB panels are checked for thickness, dimensions, surface condition, edge quality and order specifications.
OSB Buying Questions
Practical answers to common questions about OSB grades, thickness, moisture resistance, edge profiles and purchasing.
What is the difference between OSB/2, OSB/3 and OSB/4?
OSB/2 is for load-bearing use in dry conditions, OSB/3 is for load-bearing use in humid conditions, and OSB/4 is for higher-performance load-bearing applications in humid conditions. The correct grade should be selected according to structural load and the expected service environment.
Is OSB/3 waterproof?
No. OSB/3 is moisture resistant, not waterproof. It is designed for structural use in humid service conditions, but prolonged direct water exposure, standing water and uncontrolled outdoor weathering should still be avoided.
Which OSB grade is suitable for roofing and wall sheathing?
OSB/3 is commonly selected for roof decking and wall sheathing. It combines structural load-bearing performance with improved resistance to humid service conditions and is widely used in timber-frame construction.
What OSB thickness should I use for flooring?
Structural flooring commonly uses OSB panels around 15–25 mm thick. The final thickness depends on support spacing, expected load, OSB grade and the flooring system design. Higher loads or wider support spacing generally require thicker panels.
What is the difference between square edge and tongue & groove OSB?
Square edge OSB has straight-cut edges, while tongue & groove OSB uses interlocking edges. T&G panels are especially useful for subfloors and roof decking where better edge alignment and load transfer between adjacent panels are required.
Does OSB have a strength direction?
Yes. OSB has a major axis and a minor axis. The oriented surface strands normally provide higher bending strength and stiffness along the major axis, while the cross-oriented core layers support stability across the panel.
What information should I provide for an OSB quotation?
Provide the OSB grade, thickness, panel size, edge type, application, quantity and destination port. For structural projects, it is also useful to provide the service condition, support spacing and any applicable standard or certification requirement.