MgO Roof Sheathing
"Magnesium Oxide (MgO) Board Roof Protection Sheathing" is not a standardized construction term, but in practical applications, it commonly refers to a functional protective layer or composite sheathing system for roofs, using Magnesium Oxide Board (full name: Glass Fiber Reinforced Magnesium Oxychloride Cement Board) as the core material. It serves not only as a structural panel in the roofing system but also performs multiple protective functions such as fire resistance, moisture protection, structural support, and insulation substrate—hence the term "protection sheathing."
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Product Introduction
MgO board roof protection sheathing refers to the integration of MgO board as a key functional layer within the roof assembly, forming a "sheathing system" with comprehensive protective capabilities. It can be:
Single MgO protective panel: Directly installed over the structural roof deck, serving as a base for waterproofing, insulation, or fire protection.
Composite protection system: A modular system pre-assembled with MgO board, waterproofing membranes, insulation, or metal panels for rapid installation.
Fire barrier zone: In large roof areas, MgO boards are used to create fire compartments, forming a "protective sheath."
Its core function is to enhance the roof's overall safety, durability, and performance.
Advantages of MgO Roof Sheathing
|
Function |
Description |
|
Superior Fire Resistance |
Class A non-combustible material that effectively prevents fire spread across the roof-ideal for high-rise buildings, public facilities, and fire separation zones. |
|
Protection |
Resists wind, snow, and construction loads; prevents insulation compression and extends roof lifespan. |
|
Moisture & Leak Protection |
Modified MgO boards have low water absorption, providing a stable base for waterproofing and reducing leak risks from substrate deformation. |
|
Eco-Friendly & Safe |
Asbestos-free, formaldehyde-free, non-radioactive; meets green building standards and is safe for health and environment. |
|
Easy Installation |
Can be cut, nailed, and drilled; quick to install, suitable for new builds and roof renovations. |
|
Dimensional Stability |
Low shrinkage, resistant to cracking and warping, ensuring long-term roof flatness. |
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.
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 Roof Sheathing made of
MgO board is an inorganic composite panel made from a binder system of magnesium oxide (MgO), magnesium chloride (MgCl₂), and water, reinforced with alkali-resistant glass fiber mesh, along with modifiers and fillers, formed through a specialized manufacturing process.
Key Features:
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Class A non-combustible, high fire resistance
-
Lightweight yet high strength, impact-resistant
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Moisture-resistant, mold-proof, formaldehyde-free
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Dimensionally stable, resistant to warping
System Structure and Installation Method
A typical MgO board roof protection sheathing system (from bottom to top):
|
Layer |
Material |
|
1. Structural Layer |
Wood/steel trusses, concrete slab |
|
2. Vapor Barrier (optional) |
Aluminum foil, PE film |
|
3. MgO Protection Sheathing Layer |
6–12mm thick MgO board, fastened with self-tapping screws |
|
4. Insulation Layer |
XPS, EPS, rock wool, etc. |
|
5. Waterproofing Layer |
SBS, TPO, PVC membranes or spray-on coatings |
|
6. Top Layer |
Metal roofing, tiles, green roof, etc. |
✅ Key Role: The MgO board layer provides a strong, flat, and fire-resistant substrate for insulation and waterproofing layers above, while also acting as a secondary load-bearing panel and fire barrier.
Application of MgO Roof Sheathing
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Commercial & Public Building Roofs
Such as malls, schools, hospitals-where high fire safety and structural reliability are required.
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Industrial Plants & Warehouses
For large-span roofs requiring high-strength support; MgO board acts as an insulation carrier.
-
Light-Gauge Steel Roof Systems
Replaces traditional OSB or cement boards, offering lightweight, high-strength, and fire-resistant benefits.
-
Inverted Roof Systems (IRMA)
Used as a base for insulation boards to prevent displacement or compression.
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Roof Fire Barriers
In large insulated roofs, MgO boards are ideal for creating fire separation zones as required by building codes.
-
Roof Renovation & Reinforcement
Can be directly installed over old roofs to upgrade strength, flatness, and fire rating.
Magnesium Oxide Board Roof Protection Sheathing is a high-performance roofing solution that integrates structural support, fire protection, moisture resistance, and environmental safety. It not only enhances the physical performance and durability of the roof but also provides critical fire safety assurance.
As building fire codes become stricter and green construction gains momentum, MgO board-used as the core of roof protection sheathing-is becoming the preferred choice for more high-end buildings and public infrastructure projects. Selecting high-quality, technologically improved MgO board products is key to ensuring the long-term safety and reliability of your roofing system.
In one sentence: MgO board roof protection sheathing-armors your roof with a "fire-resistant shield," creating a safe, durable, and efficient roofing system
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