Fire Resistant Magnesium Oxide Board Roof Sheathing

Our Fire Resistant Magnesium Oxide Board Roof Sheathing is a purpose-engineered roofing substrate designed to redefine the performance of modern roof structures. Crafted from a synergistic blend of high-activity magnesium oxide (MgO), alkali-resistant fiberglass reinforcement, and food-grade magnesium chloride binder, this board serves as a critical protective and structural layer for residential, commercial, and industrial roofs. Unlike traditional roof sheathing materials (plywood, OSB, or standard cement board), it integrates passive fire protection, extreme weather resistance, and structural integrity-addressing the unique challenges of roofing applications (e.g., wind uplift, rain penetration, thermal stress, and fire hazards).

Engineered to act as a stable base for roofing membranes (asphalt shingles, metal panels, TPO/PVC, or green roofing), this MgO roof sheathing delivers long-term reliability in diverse climates, from humid coastal regions to frigid northern areas. Its non-combustible core, moisture-impervious structure, and high load-bearing capacity make it an ideal choice for projects requiring code-compliant fire safety, reduced maintenance, and extended service life.

Advantages of Fire Resistant Magnesium Oxide Board Roof Sheathing

① Passive Fire Protection (Euroclass A1 / ASTM E108 Class A)

Classified as non-combustible (Euroclass A1) and ASTM E108 Class A for fire resistance, it does not ignite, spread flames, or release toxic fumes when exposed to high temperatures (up to 1300°C).

Acts as a fire barrier between the roof exterior and building interior, delaying fire propagation and protecting structural rafters/joists from thermal damage-critical for meeting building codes in fire-prone zones or high-rise structures.

Maintains structural stability during fire events, preventing roof collapse and providing valuable evacuation time for occupants.

② Superior Wind Uplift & Structural Load-Bearing

Engineered with a dense, homogeneous structure (density: 1.3–1.6 g/cm³) and reinforced fiberglass mesh, offering exceptional flexural strength (≥ 5 MPa) and compressive strength (≥ 30 MPa).

Tested to withstand wind uplift pressures up to 2.5 kPa (equivalent to hurricane-level winds), ensuring secure attachment to roof framing without detachment or deformation.

Effectively supports roofing materials, insulation layers, and additional loads (e.g., solar panels, snow accumulation) with a distributed load capacity of ≥ 600 kg/m²-ideal for both low-slope and steep-slope roofs.

③ All-Weather Moisture & Rot Resistance

Unique MgO hydration matrix creates a water-repellent surface, with a 24-hour water absorption rate ≤ 8%-far lower than plywood (20–30%) or OSB (15–25%).

Resists rot, mold, and mildew even in prolonged exposure to rain, condensation, or high humidity (e.g., coastal areas, rainy seasons). Eliminates the risk of roof deterioration caused by moisture infiltration, a common flaw in traditional wood-based sheathing.

Compatible with all roofing underlayments and membranes, enhancing the overall waterproofing performance of the roof system.

④ Exceptional Weather Durability & Thermal Stability

Withstands extreme temperature fluctuations (-50°C to 90°C) without warping, cracking, or losing structural integrity-suitable for harsh climates (deserts, cold regions, or areas with frequent temperature swings).

UV-resistant surface prevents degradation from prolonged sun exposure, avoiding brittleness or color fading over time.

Low thermal expansion coefficient (≤ 0.000008 /°C) ensures minimal dimensional changes, maintaining tight seams and preventing water leakage at joints.

⑤ Eco-Friendly & Healthy Construction

Formaldehyde-free, asbestos-free, and VOC-free, meeting global environmental standards (CARB P2, E0-Class, and LEED-compliant).

Manufactured from natural, renewable mineral resources (MgO) with a low carbon footprint-100% recyclable at the end of its service life.

Safe for indoor air quality, making it suitable for residential buildings, schools, hospitals, and other spaces where health is a priority.

⑥ Easy Installation & Compatibility

Lightweight design (7–14 kg/m² for 8–12mm thickness) reduces labor intensity and transportation costs compared to heavy cementitious boards.

Can be cut, drilled, and shaped with standard carpentry tools-no special equipment required-accelerating installation timelines.

Compatible with all common roof framing systems (wooden rafters, steel purlins, concrete decks) and roofing materials (asphalt shingles, metal panels, slate, tile, or green roofs).

Available in standard sizes (1220×2440mm, 1200×3000mm) and customizable thicknesses (8mm–18mm) to fit project-specific requirements.

⑦ Long-Term Cost Efficiency

Service life exceeds 40 years under normal conditions-outperforming plywood (15–20 years) and OSB (10–15 years) by a significant margin.

Resists insect infestation (termites, carpenter ants) and corrosion, eliminating the need for costly replacements or treatments.

Reduces long-term maintenance costs, as it requires no periodic sealing, painting, or repairs.