1. Fire Resistance
Magnesium oxide board: This board is highly fire-resistant and rated as non-combustible (e.g., ASTM E136 & E84). It can achieve up to 1-2 hours of fire resistance.
OSB: Not fire-resistant and can ignite easily under high temperatures.
Gypsum Board: Fire-resistant but requires additional treatments or multiple layers to achieve high fire ratings.
Fiber Cement Board: Fire-resistant but typically less so than MgO boards.
2. Structural Strength
Magnesium Oxide Board: It is highly structurally strong and capable of being used as a load-bearing material in SIPs (Structural Insulated Panels). It is widely used in structural applications, particularly for sheathing and subflooring.
OSB: Strong and widely used in structural applications, especially in sheathing and subflooring.
Gypsum Board: Not structurally strong; primarily used for interior walls and ceilings as a non-load-bearing material.
Fiber cement board has moderate structural strength and is suitable for cladding and siding but not for load-bearing applications.
3. Moisture Resistance
MgO Board: Excellent moisture resistance; does not swell, warp, or degrade in wet conditions.
OSB: Poor moisture resistance; swells and deteriorates when exposed to water.
Gypsum Board: Limited moisture resistance; prone to mold and mildew when exposed to moisture.
Fiber Cement Board: It is good at resisting moisture but can absorb water over time, leading to potential issues in very wet conditions.
4. Environmental Impact
MgO Board: Eco-friendly, made from natural materials, and fully recyclable. It also contributes to better indoor air quality.
OSB: Made from wood, which is renewable, but the production process can involve the use of chemicals and glues.
Gypsum Board: Gypsum is abundant and recyclable, but manufacturing can be energy-intensive.
Fiber Cement Board: Made from a mix of cement, sand, and cellulose fibers, with a moderate environmental impact due to the energy required for cement production.
5. Durability and Longevity
MgO Board: Extremely durable, resistant to insects, mold, and mildew, with a long lifespan.
OSB: Durable under dry conditions but can degrade rapidly if exposed to moisture.
Gypsum Board: Less durable, particularly in wet or high-impact environments.
Fiber Cement Board is durable and resistant to pests, mold, and rot. When properly installed, it has a long lifespan.
6. Ease of Installation
MgO Board: Lightweight, easy to install, and can be cut with standard tools.
OSB: Easy to install, commonly used in construction, and well-known to contractors.
Gypsum Board: Easy to install for interior applications but unsuitable for exterior use without additional protection.
Fiber Cement Board: Heavier and more challenging to cut and install than the others.
Summary:
Magnesium oxide boards offer superior fire resistance, moisture resistance, and durability compared to OSB, gypsum, and fiber cement boards. While they may be more expensive, their long-term performance and eco-friendly nature make them a strong candidate for sustainable and high-performance construction.
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