Magnesium Oxide MGO Fireproof Board For Roof Sheathing

 Magnesium Oxide MGO Fireproof Board for Roof Sheathing

MGO Fireproof Board for Roof Sheathing is a premium inorganic mineral-based structural panel specifically engineered for roof sheathing applications, designed to replace traditional OSB, plywood, cement board, and asbestos roof boards. It combines A1-level non-combustible fire protection, superior water/moisture resistance, wind uplift resistance, lightweight design, and long-term weatherability, making it the optimal structural substrate for sloped/flat roofs in residential, commercial, industrial, and high-safety buildings.

Advantages of Magnesium Oxide MGO Fireproof Board for Roof Sheathing

1. This A1 non-combustible board delivers strong roof fire protection, stays stable under high heat without toxic smoke or collapse, and meets strict fire safety rules for key buildings.

 

2. This board offers great resistance to strong wind uplift, holds tightly to roof structures, and won't crack or let water in even in heavy wind conditions.

 

3. Its lightweight design eases roof structural load, makes transport and installation much easier, and helps cut labor costs while simplifying building design.

 

4. This inorganic board naturally resists termites and mold without any toxic treatments, completely eliminating roof rot and keeping indoor air safe.

 

5. This non-toxic, eco-friendly board meets green building standards, is fully recyclable, and lasts much longer to cut down on construction waste.

 

6. This board provides great thermal and sound insulation for roofs, helping save energy and reduce unwanted noise effectively.

Core Composition (Roof-Specific Formulation)

Roof sheathing MGO boards adopt an inorganic mineral composite system (most use MgSO₄ magnesium sulfate binder instead of traditional MgCl₂ to avoid halogen return/corrosion in humid roof environments), with key components tailored for roof performance:

Component	Function (Roof-Specific)
High-purity Magnesium Oxide (MgO)	Core structural matrix, provides high fire resistance and compressive strength
Magnesium Sulfate (MgSO₄)	Primary binder (critical for roofs): eliminates "halogen return/sweating" and steel truss corrosion, stable in high-humidity/rainy conditions
Multi-layer Fiberglass Mesh Reinforcement	Enhances flexural strength and crack resistance (resists roof thermal expansion/contraction and wind uplift)
Lightweight Weather-Resistant Aggregates (Perlite, Vermiculite, Modified Fly Ash)	Reduces density, improves thermal insulation, and resists UV/weathering
Inorganic UV Stabilizers & Weather Modifiers	Enhances resistance to UV radiation and temperature cycling (prevents surface chalking/cracking)
Non-Woven Fabric Surface Layer	Improves bonding with roof waterproofing membranes (SBS/APP modified bitumen, TPO, PVC)

Key Formulation Advantage for Roofs: MgSO₄-based formula avoids the steel truss corrosion and surface "sweating" issues of MgCl₂ MGO boards, making it the only choice for steel-structured roofs, coastal roofs, and high-humidity regions.

 

Standard Specifications (Roof Sheathing Exclusive)

Roof sheathing MGO boards are available in thicknesses and sizes tailored to roof load and span requirements, with edge profiles optimized for waterproofing:

Thickness: 12mm, 15mm, 18mm, 20mm - 12mm: Light-duty residential sloped roofs (truss spacing ≤400mm)- 15mm: Standard residential/commercial roofs (truss spacing 400–600mm, most popular)- 18–20mm: Heavy-duty industrial/high-wind roofs (truss spacing 600–800mm)

Dimensions: 1220×2440mm (4×8ft), 1200×2400mm, 610×2440mm (half-sheet) Standard international sizes; half-sheets for narrow roof areas

Density: 0.8–1.25 g/cm³ Balances lightweight and wind uplift resistance

Edge Profile: - Tongue & Groove (T&G): Tight joints, reduces water intrusion- Lap Edge (Ship-Lap): Overlapping edges (50–100mm overlap), preferred for flat roofs/high-rain regions- Square Edge: Basic design, used with sealant for sloped roofs

Surface Finish: - Smooth: For bonding with waterproofing membranes- Anti-Skid: For roof access/photovoltaic (PV) panel installation- UV-Resistant Coated: For exposed roof sheathing (no immediate waterproofing layer)

Fire Rating: A1 Non-Combustible ASTM E136, GB 8624 A1

Water Absorption: ≤12% 72h immersion test

Flexural Strength: ≥12 MPa (12mm), ≥14 MPa (15mm), ≥16 MPa (18–20mm) Structural grade for roof loads

Wind Uplift Resistance: ≥2.5 kPa ASTM E330 tested

Freeze-Thaw Resistance: ≥50 cycles ASTM C666 tested

Termite Resistance: ASTM D3345 Certified Permanent

Application

Residential

Sloped roofs of villas, townhouses, and light steel villas (lightweight, fireproof, termite-proof).

Flat roofs of apartments and low-rise homes (waterproof, freeze-thaw resistant).

Attic conversions (fire resistance meets building code requirements).

 

Commercial

Flat/sloped roofs of hospitals, schools, and shopping malls (A1 fire rating for public safety).

Office buildings and high-rises (reduces structural load, fire-resistant).

Hotels and resorts (coastal regions: salt spray resistance, no corrosion).

 

Industrial

Warehouses and logistics parks (heavy-load, wind-resistant, fireproof).

Factories and manufacturing plants (chemical resistance, no mold/rot).

Data centers (critical fire protection for server rooms, moisture resistance).

 

Special & High-Safety Scenarios

Photovoltaic (PV) Panel Roofs: High strength supports PV mounting systems; fireproof protects PV equipment.

Old Building Roof Renovations: Lightweight design avoids overloading existing structures; fire resistance upgrades building safety.

Coastal/High-Wind Regions: Typhoon/hurricane wind uplift resistance, salt spray resistance.

Cold Regions: Freeze-thaw resistance, no cracking in sub-zero temperatures.

Green Roofs: Inorganic composition supports growing medium; moisture resistance prevents rot.

 

Comparison with Traditional Roof Sheathing Materials

Material	Fire Rating	Water/Weather Resistance	Wind Uplift	Weight (15mm)	Termite/Mold Resistance	Lifespan	Environmental Performance	Cost
MGO Fireproof Board	A1 Non-Combustible	Excellent (≤12% absorption, 50+ freeze-thaw cycles)	≥2.5 kPa	16–20 kg/㎡	100% Permanent	50+ years	Formaldehyde/Asbestos-free, recyclable	Medium
OSB Board	B2 Combustible	Poor (swells, rots, mold-prone)	1.5–2.0 kPa	18–22 kg/㎡	Poor (needs treatment)	15–20 years	Contains formaldehyde, non-recyclable	Low
Plywood	B2 Combustible	Poor (swells, delaminates)	1.8–2.2 kPa	17–21 kg/㎡	Poor (needs treatment)	10–15 years	Contains formaldehyde, non-recyclable	Low-Medium
Cement Board	A1 Non-Combustible	Good (15–20% absorption)	2.0–2.3 kPa	28–32 kg/㎡	Good	30–40 years	Inorganic, no toxic additives	Medium-High
Asbestos Board	A1 Non-Combustible	Good	1.5–2.0 kPa	20–24 kg/㎡	Good	20–30 years	Asbestos-containing, toxic, banned	Low (obsolete)

 

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.

 

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