MGO Board Fireproof Magnesium Oxide Board Panel Roof Sheeting Underlayment
Magnesium Oxide Board (MGO Board) is a high-performance, eco-friendly building material that has revolutionized modern construction, particularly in fire-resistant and moisture-prone applications like roof sheeting and underlayment. This mineral-based composite offers exceptional durability, safety, and versatility, making it an ideal choice for both residential and commercial projects worldwide.
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Product Introduction
MGO Board, also known as Magnesium Oxide Board, Magnesium Cement Board, or Magnesium Gel Board, is a non-combustible building panel composed primarily of active magnesium oxide (MgO), a magnesium salt (typically magnesium chloride MgCl₂ or magnesium sulfate MgSO₄), mineral fillers (perlite, vermiculite, or wood chips), and reinforced with fiberglass mesh and non-woven fabrics. These components undergo a chemical reaction to form a stable, cementitious matrix that delivers outstanding structural integrity and performance.
1. Exceptional Fire Resistance (A1 Class Non-Combustible)
Highest fire rating (A1 per EN 13501-1, Class A per ASTM E84)
Withstands temperatures up to 1200°C without igniting
No toxic smoke emission during fire exposure - releases only water vapor
Fire resistance duration: 60-240 minutes (depending on thickness)
Acts as a thermal barrier, slowing heat transfer and providing critical evacuation time
2. Superior Moisture & Water Resistance
Resists water absorption and moisture damage better than traditional gypsum or OSB boards
7-day water immersion test: No swelling, delamination, or loss of structural integrity
Ideal for high-humidity environments like coastal areas, basements, and roof applications
Mold and mildew resistant - does not provide organic food source for microbial growth
3. Structural Performance
High flexural strength: 15-22 MPa (dry and wet conditions)
Dimensional stability: Minimal expansion/contraction with temperature and humidity changes
Impact resistance: Superior to gypsum board, resisting cracking from minor impacts
Lightweight (600-900 kg/m³) compared to cement boards, simplifying handling and installation
4. Additional Benefits
Eco-friendly: 100% asbestos-free, low VOC emissions, and recyclable
Thermal insulation: Lower thermal conductivity than traditional sheathing materials
Sound absorption: Reduces noise transmission between spaces
Termite and insect proof: No organic components to attract pests
Easy workability: Can be cut, drilled, and installed like traditional drywall
Corrosion resistance (especially MgSO₄ formulations) - safe for use with metal fasteners
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 with 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 MGO Board for Roofing?
- Weatherproof Protection: Maintains integrity in extreme weather conditions (rain, snow, wind)
- Fire Barrier: Prevents roof fires from spreading to the building interior
- Substrate Stability: Creates a flat, rigid surface for roofing materials (shingles, tiles, metal)
- Condensation Control: Resists moisture buildup that can damage insulation and structure
- Longevity: Withstands UV exposure and temperature fluctuations better than organic alternatives
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.
MGO Board Fireproof Magnesium Oxide Board Panel Roof Sheeting Underlayment
Core Composition Breakdown
| Component | Function |
|---|---|
| Magnesium Oxide (MgO) | Main binder providing fire resistance and strength (melting point ~2852°C) |
| Magnesium Salt | Activator for MgO hydration reaction, forming stable magnesium hydroxide |
| Fiberglass Mesh | Reinforcement to prevent cracking and enhance flexural strength |
| Mineral Fillers | Lightweighting agent, improving thermal insulation and reducing density |
| Non-woven Fabric | Additional reinforcement and surface finishing |
| Special Additives | Stabilizers to control chloride ion activity, preventing corrosion |
Technical Specifications
Standard Dimensions
| Parameter | Range | Common Sizes |
|---|---|---|
| Length | 2400-3660mm | 2440mm (8ft), 3050mm (10ft) |
| Width | 1200-1250mm | 1220mm (4ft) |
| Thickness | 3-25mm | 6mm, 8mm, 10mm, 12mm, 15mm (roof applications) |
| Density | 600-900 kg/m³ | 750-850 kg/m³ (standard) |
Performance Metrics (Roof Grade)
Fire Rating: A1 (Non-combustible) per EN 13501-1, Class A per ASTM E84
Water Absorption: <15% (24-hour immersion)
Flexural Strength: ≥12 MPa (dry), ≥10 MPa (wet)
Thermal Conductivity: 0.15-0.25 W/m·K
Sound Insulation: 35-45 dB (12mm thickness)
Service Temperature: -40°C to +80°C
MGO Board Fireproof Magnesium Oxide Board Panel Roof Sheeting Underlayment
Roofing Applications
1. Roof Sheeting/Decking
Suitable for flat roofs, low-slope roofs, and pitched roofs
Provides a stable base for waterproofing membranes and finishing materials
Available in various thicknesses (6-25mm) to accommodate different load requirements
Ideal for:
- Commercial buildings (warehouses, factories, shopping centers)
- Residential homes in wildfire-prone areas
- Industrial facilities with high fire risk
2. Roof Underlayment
Installed between roof deck and final covering as an additional water barrier
Acts as a secondary fire protection layer in case of covering material failure
Prevents wind-driven rain from penetrating the roof assembly
Can be used with:
- Asphalt shingles
- Metal roofing
- Clay/concrete tiles
- Green roof systems
MGO Board Fireproof Magnesium Oxide Board Panel Roof Sheeting Underlayment
Main Applications:
Industrial buildings: Factory buildings, warehouses, workshop roofs
Commercial buildings: Shopping malls, supermarkets, office building roofs
Public buildings: Schools, hospitals, stadium roofs
Residential buildings: Flat roof and sloped roof renovation
Special places: Chemical plants, laboratories and other buildings with high fire protection requirements
Applicable Environments:
Humid and rainy areas
High temperature and humidity environments
Places with fire protection requirements
Coastal corrosive environments
Comparison to Traditional Roofing Materials
| Feature | MGO Board | OSB/Plywood | Gypsum Board | Cement Board |
|---|---|---|---|---|
| Fire Resistance | A1 Class (Non-combustible) | Combustible | A Class (with paper removed) | A1 Class |
| Moisture Resistance | Excellent (7-day immersion) | Poor (swells/warps) | Poor (dissolves) | Good |
| Weight | Light (750 kg/m³) | Medium (650 kg/m³) | Light (600 kg/m³) | Heavy (1200 kg/m³) |
| Workability | Easy (cut/drill like drywall) | Medium | Easy | Difficult |
| Durability | 50+ years | 15-20 years | 10-15 years | 50+ years |
| Cost | Moderate | Low | Low | High |
| Roof Application Suitability | Excellent | Moderate (only covered) | Poor | Good |
MGO Board Fireproof Magnesium Oxide Board Panel Roof Sheeting Underlayment
Installation Guidelines for Roof Applications
Proper installation is critical to maximize MGO Board performance in roofing systems. Follow these best practices:
1. Preparation
Ensure roof framing is structurally sound and meets local building codes
Use treated lumber for roof joists in high-moisture environments
Store MGO boards flat and dry before installation
2. Installation Steps
For Roof Decking
Start at the eaves: Install first row of boards perpendicular to roof trusses/joists
Spacing: Leave 2-3mm expansion gaps between boards to accommodate thermal movement
Fastening: Use corrosion-resistant screws (stainless steel or hot-dipped galvanized)
- Spacing: 150-200mm along edges, 300mm in field
- Depth: Sink screws to just below surface without breaking the fiberglass mesh
Seaming: Apply MGO-compatible sealant to all board joints before installing the next row
Overhang: Allow 25-50mm overhang at eaves for water runoff
For Roof Underlayment
Install over existing deck: Ensure deck is clean, dry, and free of debris
Lay perpendicular to roof slope: Overlap seams by 150mm
Fasten securely: Use cap nails or screws every 300mm
Seal all penetrations: Around vents, chimneys, and skylights with flashing and sealant
3. Installation
Install appropriate roofing underlayment felt or synthetic membrane
Apply final roofing material according to manufacturer's instructions
Ensure proper drainage and ventilation to prevent moisture buildup
FAQ
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