Magnesium Oxide (MgO) board can be used as an underlayment in flooring systems, offering several benefits due to its durability, moisture resistance, and fire-resistant properties. Here's an overview of the MgO board as an underlayment:

 

Benefits of MgO Board as Underlayment:

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1. Moisture Resistance:
   - MgO boards are highly resistant to moisture, making them an ideal underlayment in areas prone to dampness, such as bathrooms, kitchens, and basements. This resistance helps prevent issues like mold, mildew, and rot, which are common in traditional underlayment materials.

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2. Fire Resistance:
   - MgO boards have excellent fire-resistant properties, often achieving Class A fire ratings and meet with the ASTM E84 grade. This adds an extra layer of protection to flooring systems, especially in residential and commercial buildings where fire safety is a concern.

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3. Durability:
   - MgO boards are strong and durable, capable of handling the stresses of flooring installation. They are less likely to crack, warp, or degrade over time, ensuring a long-lasting and stable flooring foundation.

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4. Versatility:
   - MgO boards can be used with various types of flooring, including tile, vinyl, laminate, and hardwood. Their compatibility with different adhesives and installation methods makes them a flexible choice for different flooring projects.

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5. Eco-Friendliness:
   - MgO boards are made from natural and abundant materials, with a lower carbon footprint compared to traditional options like plywood or cement board. This makes them a sustainable choice for environmentally-conscious projects.

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6. Sound Insulation:
   - MgO boards can contribute to sound insulation, reducing floor noise transmission. This is particularly beneficial in multi-story buildings where noise control is important.

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Installation Considerations:

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Cutting and Handling:
MgO boards can be cut using standard tools, but proper techniques are important to avoid chipping or breaking the board edges. A circular saw with a carbide blade is recommended for clean cuts.

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Fastening:
When installing MgO boards as underlayment, screws should be used instead of nails to ensure a secure attachment. It's also crucial to follow the manufacturer's guidelines for screw spacing and placement to avoid any issues with movement or buckling.

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Sealing:
While MgO boards are moisture-resistant, it's advisable to seal joints and edges with an appropriate sealant to prevent water penetration, especially in wet areas.

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Surface Preparation:
The surface of the MgO board should be clean, dry, and free of dust before applying any adhesives or flooring materials. This ensures proper adhesion and prevents issues down the line.

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Common Applications:

Residential Flooring: Bathrooms, kitchens, basements, and laundry rooms.
Commercial Spaces: Areas with high foot traffic or requiring fire resistance.
Multi-Family Housing: Provides sound insulation and fire protection between units.

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MgO board as an underlayment provides a robust and versatile foundation for various flooring types, enhancing the overall performance and longevity of the floor system.