MgO Board Roofing Sheathing
Magnesium oxide board roof sheathing is a modern functional roofing material that combines fire resistance, lightweight design, high strength, and environmental friendliness. It significantly improves roofing system safety (especially fire performance), durability, and construction efficiency. As building fire codes become stricter, the application of MgO boards in roofing is increasingly promising.
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Product Introduction
Magnesium Oxide (MgO) Board Roof Sheathing is a protective or overlay product designed for roofing systems, using Magnesium Oxide Board (also known as Glass Fiber Reinforced Magnesium Oxychloride Cement Board) as its core material. It typically serves as a secondary structural layer, insulation substrate, or fire barrier in roofing assemblies, providing support, protection, and enhanced overall roof performance.
| Property | Description |
|---|---|
| Excellent Fire Resistance | Classified as Class A non-combustible, with fire resistance up to 1–2 hours or more, effectively preventing fire spread. Ideal for roof fire barriers. |
| High Strength & Impact Resistance | Glass fiber reinforcement provides high flexural and compressive strength, capable of withstanding construction, wind, and snow loads. |
| Moisture & Water Resistance | Modified MgO boards exhibit good water resistance and are less prone to water absorption or deformation (though prolonged immersion may affect performance). |
| Lightweight | Density typically ranges from 1.0–1.3 g/cm³, lighter than traditional cement boards, reducing roof load. |
| Dimensional Stability | Low drying shrinkage, resistant to cracking and warping, ensuring roof flatness. |
| Eco-Friendly & Non-Toxic | Free from asbestos, formaldehyde, and radioactivity; meets green building standards. |
| Corrosion Resistance | Resistant to common acidic and alkaline environments, suitable for various climates. |
| Easy to Install | Can be cut, nailed, and drilled; simple to handle and compatible with various building materials. |
Our Company
We are a company dedicated to magnesia cement products. Our main products are Magnesium Oxide Boards (MGO Board) for construction and laminated MgO boards for furniture and renovation. Our mission is to provide the world's construction markets with environmentally friendly, high-performance and sustainable green materials.
We work with China Magnesium Materials Association (CMMA) and Magnesium Oxide Association (MOCA) in North America to raise awareness and promote the use of magnesium oxide cement products. We focus on the quality control and consistency of the MGO products. We have been actively involved in developing American Society for Testing and Materials (ASTM) standards related with MGO products.
Why Choose Us
High-Quality, Consistent Products
We use advanced modified formulations and fully automated production lines to ensure our MgO boards are free from moisture return, efflorescence, and warping, offering high strength, moisture resistance, and performance that exceeds national standards (GB/T 25973).
Class A Fire-Rated Safety
All our products are certified by national authorities as Class A non-combustible materials, providing reliable fire protection and meeting strict fire safety inspection requirements.
Eco-Friendly & Healthy
Our boards are asbestos-free, formaldehyde-free, and non-radioactive, complying with green building standards and environmental regulations-ideal for sustainable construction projects.
Large-Scale Production & Fast Delivery
With a modern, large-scale manufacturing base, we maintain ample stock and support bulk customization, ensuring timely delivery to keep your project on schedule.
Professional Technical Support
We offer comprehensive technical services-from product selection and installation guidance to full system solutions-helping you optimize applications and improve construction efficiency and quality.
Excellent Value & Reliable Service
We deliver competitive pricing through efficient cost control. Supported by a nationwide distribution network and responsive after-sales team, we ensure prompt service and peace of mind.
Magnesium oxide wall board is a technologically advanced building material that offers superior performance in every category when compared to traditional wood, gypsum and cement based products.
Magnesium Oxide Wall Panels are cementitious substrate products reinforced with magnesium oxide fibre matting.
Fire resistant magnesium oxide wallboard is a new type of refractory material. It is widely used primarily as a wallboard alternative to conventional gypsum-based drywall and plywood.
It is non combustible and fire rated Class A1. With options for up to a 2 hour fire resistance, MgO Board offers an innovative passive fire protection alternative for your construction projects.
MgO board has very good fire performance. It does not spread flames or smoke. It is noncombustible and fire-rated A1, which helps protect homeowners, tenants and building occupants while mitigating damage and loss.
Magnesium oxide wall board is made of magnesium oxide, magnesium sulfate or magnesium chloride, glass fiber mesh, perlite and wood fiber.
It is an upgraded product of fireboard. A properly constructed assembly with our MgO fireproof wall board can achieve a 3-hour fireproof rating.
Fire Resistant Internal Wall Board
Our Fire Resistant Internal Wall Board is a fiberglass reinforced magnesium oxide cement board. It can be used to replace traditional gypsum drywall for wall and ceiling finishes and sheathing.
Fireproof Exterior Wall Panels
Magnesium oxide board is a new type of fire-resistant building material. The main raw materials are magnesium oxide, magnesium chloride/sulfate and perlite.
What Is MgO Board Roofing Sheathing Made of
Magnesium oxide board is an inorganic composite panel made primarily from magnesium oxide (MgO), magnesium chloride (MgCl₂), water, and reinforced with alkali-resistant glass fiber mesh. It is produced through mixing, molding, and curing processes.
Main Components:
Magnesium Oxide (MgO): Derived from calcined magnesite, it serves as the primary alkaline ingredient.
Magnesium Chloride (MgCl₂) or Magnesium Sulfate(MgSo4): Typically sourced from brine, acting as a binder and hardening agent.
Glass Fiber Mesh Cloth: Provides tensile strength and impact resistance.
Fillers: Such as fly ash, wood flour, or lightweight aggregates, used to adjust density and reduce cost.
Modifiers: Added to improve water resistance, prevent efflorescence, and reduce warping.
Structure and Form of MgO Roof Sheathing
MgO roof sheathing is typically supplied in flat panel form and cut on-site according to project requirements. Its typical structure includes:
- Surface Layer: A smooth or textured inorganic surface that can directly bond waterproofing membranes, receive spray-on coatings, or serve as a base for insulation.
- Reinforcement Layer: Multiple layers of cross-laid glass fiber mesh providing structural strength.
- Core Layer: A dense matrix formed by magnesium oxychloride cement slurry.
In roofing systems, it is commonly installed in the following sequence:
- Roofing Tiles/Metal Panels → Waterproofing Layer → MgO Sheathing → Insulation Layer → Structural Roof Deck
Alternatively, it may serve as:
- Support for insulation or substrate for fire barrier zones
What is MgO Board Roofing Sheathing Used For
Main Applications in Roofing Systems
- Insulation Substrate/Support Board:
In inverted or external insulation roofs, MgO board acts as a support for insulation boards (e.g., XPS, EPS), preventing compression or displacement.
- Fire Barrier Strip:
In large insulated roofs, fire barriers are required by code. MgO board, due to its Class A fire rating, is often used as the substrate or the barrier itself.
- Base for Waterproofing Membranes:
Provides a flat, strong substrate for flexible membranes (e.g., SBS, TPO) or liquid coatings (e.g., polyurethane), enhancing waterproofing durability.
- Secondary Structural Board for Light-Gauge Steel Roofs:
Replaces traditional OSB or cement boards in light steel structures, serving as a secondary load-bearing panel with combined fire and structural functions.
- Roof Renovation and Reinforcement:
Can be directly installed over existing roofs to reinforce and upgrade fire rating and structural integrity.
Suitable Building Types of MgO Board Roofing Sheathing
- Commercial buildings (malls, offices)
- Industrial plants
- Public buildings (schools, hospitals)
- High-rise residential roofs
- Any building with high fire safety requirements
FAQ
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