Magnesium Oxide Roof Decking
As a new-generation chlorine-free magnesium board, Magnesium Oxide Sulfate Wall Sheathing Board is gradually replacing traditional gypsum, cement, and magnesium oxychloride boards worldwide with its comprehensive advantages of Class A1 fire resistance, excellent water resistance, no metal corrosion, and eco-friendliness. It is the ideal choice for modern building wall sheathing, especially for residential, commercial, and industrial projects with high durability and environmental requirements.
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Product Introduction
Magnesium Oxide Roof Decking
Magnesium Oxide Sulfate Wall Sheathing Board (abbreviated as MgSO₄ Board or Sulfur-Oxygen-Magnesium Wall Board) is a new type of chlorine-free eco-friendly building board. It is made by using light-burned magnesium oxide (MgO) and magnesium sulfate (MgSO₄) as core cementitious materials (replacing traditional magnesium chloride MgCl₂), combined with fillers such as wood fiber and perlite, reinforced with glass fiber mesh, and manufactured through a special pressing and curing process. It is specially designed for wall cladding and structural sheathing applications.
Cementitious System: High-purity active MgO, high-quality MgSO₄ Provides strength and stability, forms sulfur-oxygen-magnesium crystal network
Reinforcement: Double-sided glass fiber mesh, filament non-woven fabric Anti-cracking, improves toughness, prevents board breakage
Fillers: Wood fiber, bamboo fiber, perlite Reduces density, enhances thermal/sound insulation, improves workability
Modifiers: Polymers, special additives Optimizes hydration, boosts water resistance and aging resistance
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Standard: Double-sided glass fiber mesh + composite core + polymer modifiers
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Edge Designs: Square edge, shiplap edge, tongue-and-groove (T&G) edge for different installation needs
|
Performance |
Typical Value |
International Standard |
Advantage Description |
|---|---|---|---|
|
Fire Rating |
Class A1 Non-Combustible |
EN 13501-1 |
Non-flammable at 1200°C, no toxic smoke release |
|
Density |
850–1100 kg/m³ |
ASTM C1185 |
30% lighter than cement board, 50% stronger than gypsum board |
|
Flexural Strength |
≥12 MPa |
GB/T 7019 |
Excellent load-bearing capacity for structural sheathing |
|
Water Resistance |
≥90% strength retention after 7-day immersion |
JIS A5441 |
No moisture absorption or efflorescence, stable in humid environments |
|
Formaldehyde Emission |
Not Detected (ND) |
E0 Standard |
Zero formaldehyde, asbestos-free, VOC-free, eco-friendly |
|
Thermal Conductivity |
0.18–0.25 W/(m·K) |
ASTM C518 |
Good thermal insulation, reduces building energy consumption |
|
Dimensional Stability |
Moisture expansion ≤0.15% |
ASTM D1037 |
Almost no deformation under humidity changes |
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No Efflorescence/Moisture Absorption: Eliminates surface condensation and whitening caused by chloride ion migration in traditional MgO boards
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No Metal Corrosion: Zero corrosion to steel structures and metal accessories, ideal for light steel keel systems
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Stable in Humid Environments: Performs excellently in basements, bathrooms, coastal areas, etc.
- Lightweight & High-Strength: Reduces transportation and installation costs, operable by single person
- Easy Processing: Sawable, nailable, drillable with standard woodworking tools
- Surface Compatibility: Direct painting, wallpapering, tiling without extra treatment
- Long Durability: Insect-proof, mold-resistant, aging-resistant, service life up to 50+ years
- 12.7mm (1/2") thickness recommended, ICC-ES ESR-4642 certified for exterior structural sheathing
- Provides excellent wind load and impact resistance, compatible with rainscreen systems
- Ideal for high-humidity, salt-spray environments (e.g., coastal areas) with no metal corrosion risk
- Residential/commercial interior wall cladding, fire compartment partitions
- Preferred material for kitchens, bathrooms, basements and other wet areas
- Suitable for clean rooms, hospitals, food processing plants with high hygiene requirements
- Ceiling substrates, floor underlayment
- Steel structure cladding, fireproof encapsulation
- Prefabricated building components, container lining
- Material Selection: ≥12.7mm for exterior walls, ≥6mm for interior walls
- Joist Spacing: ≤406mm (exterior), ≤600mm (interior), ensure board edges land on joists
- Environment: 5–35°C, RH ≤85%, avoid construction in rain
- Substrate Preparation: Ensure flat joists with accurate spacing; optional anti-rust treatment for steel structures
- Cutting: Use diamond saw or special cutter for smooth edges
Fastening:
- Exterior: Hot-dip galvanized self-drilling screws, spacing ≤200mm, edge distance ≤15mm, screw head recessed 0.5–1mm
- Interior: Nails or screws, spacing ≤250mm
Joint Treatment:
- Leave 2–3mm expansion joints, fill with elastic sealant
Surface Treatment: Direct application of waterproof coating (exterior) or decorative layers (interior)
About The Factory：
Our Service：
1. Reply your enquiry in 24 working hours.
2. Experienced staffs answer your questions in professional and fluent English.
3. The dimensions can be customized.
4. Special discount and protection of sales are provided.
5. Be the best magnesium oxide board supplier in China.
Company Advantage (Why choose us)：
We have joined hands with the China Magnesium Materials Association (CMMA), the North American Magnesium Oxide Building Materials Association (MgOBPA), and the Magnesium Oxide Association (MOCA) to jointly promote the popularization of magnesium oxide cement products in the field of building applications.
Packing and Shipping:
Packaging and Shipping of Magnesium Oxide Roof Decking
Q: What is the core difference between MgSO₄ board and traditional MgO (MgCl₂) board?
A: The key difference is the cementitious material-MgSO₄ board uses magnesium sulfate instead of magnesium chloride, completely solving the two fatal flaws of traditional MgO boards: efflorescence/moisture absorption and metal corrosion, making it more suitable for long-term use and steel structure buildings.
Q: How is its fire performance? Can it pass international certifications?
A: MgSO₄ board meets Class A1 Non-Combustible standards, non-flammable at 1200°C with no toxic smoke. It has passed international certifications such as EN 13501-1 and ASTM E119, meeting fire requirements for various buildings.
Q: Will it deform or mold in high-humidity environments?
A: No. The sulfur-oxygen-magnesium crystalline phase is extremely stable, non-absorbent and non-efflorescent. Even after 7 days of immersion, it retains over 90% strength, and is naturally mold and insect resistant-ideal for wet areas like basements and bathrooms.FAQ
Q: What advantages does MgSO₄ board have over cement board?
A: MgSO₄ board is ~50% lighter with comparable strength, easier to install; it also has better water resistance and crack resistance, and avoids post-cracking caused by alkali-aggregate reaction in cement boards, offering higher overall cost performance.
Q: Is it eco-friendly? Does it contain formaldehyde or asbestos?
A: Absolutely. MgSO₄ board is zero formaldehyde, asbestos-free, VOC-free, releasing no harmful substances, complying with EU E0 standards-an ideal choice for green buildings.
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