Top 5 MGO Board Problems and How to Avoid Them

Introduction

Magnesium oxide board, commonly known as MGO board, has gained popularity in modern construction thanks to its fire resistance, strength, and eco-friendly nature. Contractors often choose it as an alternative to traditional gypsum or cement boards for walls, ceilings, and flooring.

However, like any building material, MGO boards are not free from drawbacks. Over the years, architects and builders have reported several mgo board problems during installation and long-term use. While these issues don’t necessarily outweigh the benefits, they are important to understand before starting a project.

This article highlights the top 5 MGO board problems and provides practical solutions to avoid them. By knowing the risks and applying the right strategies, builders can maximize the benefits of MGO boards while minimizing potential setbacks.

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1. Moisture Absorption and “Sweating”

Why It Happens

One of the most common mgo board problems is its tendency to absorb moisture. Since MGO board is made with magnesium oxide and, in some cases, magnesium chloride, it can react with humidity in the air. When installed in poorly ventilated or high-moisture environments, the board may release liquid droplets on the surface, a phenomenon often described as “sweating.”

Potential Risks in Construction

Excessive moisture can lead to several issues:

• Paint or wallpaper peeling off walls

• Joint compounds losing adhesion

• Mold growth in extreme cases

• Structural instability if the board swells or softens

For projects like bathrooms, kitchens, or basements, this moisture issue becomes even more critical. If not handled properly, it can shorten the building’s service life and increase maintenance costs.

How to Prevent or Solve

To minimize these mgo board problems, contractors can take preventive steps:

• Use MGO boards with lower chloride content, ideally tested for moisture resistance.

• Apply waterproof sealants or coatings before finishing the surface.

• Ensure good ventilation during installation and in the building’s design.

• Avoid exposing the boards to direct rain or water contact before they are fully sealed.

By taking these precautions, builders can prevent most moisture-related failures and maintain the board’s durability.

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2. Corrosion of Metal Components

Interaction with Chloride Content

Another notable issue among mgo board problems is the potential corrosion of nearby metal components. Some MGO boards, especially those made with magnesium chloride, can release chloride ions over time. When these ions come into contact with steel or aluminum fasteners, screws, or frames, they may trigger rust and corrosion.

Problems in Long-Term Durability

Corrosion can have several negative impacts:

• Weakening of metal fasteners, reducing structural integrity

• Stains on walls or ceilings caused by rust

• Increased maintenance costs due to frequent repairs

• Possible safety hazards in load-bearing applications

These problems often appear months or even years after installation, making them easy to overlook during initial construction.

Solutions and Better Practices

To address corrosion issues, consider the following:

• Choose MGO boards with low or zero chloride content, especially for interior applications.

• Use corrosion-resistant fasteners such as stainless steel or galvanized screws.

• Apply protective coatings to any exposed metal near the MGO board.

• Store boards in dry conditions before installation to reduce chloride migration.

With these precautions, the risk of metal corrosion can be significantly minimized, ensuring the longevity and safety of the construction project.

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3. Cracking and Warping

Causes of Structural Instability

Cracking and warping are frequent mgo board problems that can affect both walls and flooring. These issues usually result from:

• Uneven drying or curing during production

• Improper storage or handling before installation

• Exposure to sudden temperature or humidity changes

• Over-tightening screws or poor installation techniques

Even minor cracks can compromise the aesthetic and structural integrity of a project, especially in visible areas like ceilings or decorative walls.

Common Cases in Flooring and Walls

• Floorboards that warp due to moisture accumulation under the surface

• Wall panels that crack along joints or edges

• Ceilings showing hairline cracks after long-term environmental stress

These cases highlight the importance of careful handling and proper installation techniques to reduce the risk of defects.

How to Minimize These Issues

• Store MGO boards flat in a dry, ventilated area before use.

• Allow boards to acclimate to the room’s temperature and humidity before installation.

• Avoid over-tightening screws; use recommended fasteners and spacing.

• Apply joint compounds and coatings evenly to prevent uneven expansion or contraction.

By following these practices, builders can avoid most cracking and warping issues, ensuring a smooth and durable finish.

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4. Limited Compatibility with Certain Finishes

Adhesion Challenges with Paints and Coatings

A lesser-known category of mgo board problems involves finishing materials. While MGO boards are strong and fire-resistant, they can sometimes show poor adhesion with certain paints, coatings, or adhesives. For example:

• Some water-based paints may peel off

• Decorative films or laminates may not stick evenly

• Oil-based finishes can take longer to cure or require special primers

These challenges can affect both aesthetics and long-term durability.

Issues When Applying Decorative Films

For interior designers and contractors, decorative finishes like wallpapers or PVC films can be particularly tricky:

• The board’s surface may be too smooth or chemically reactive for standard adhesives

• Improper priming may lead to bubbles, peeling, or uneven textures

• Certain coatings may react with residual chloride in the board, causing discoloration

Recommended Alternatives

To overcome these mgo board problems, professionals often use these solutions:

• Apply a suitable primer designed for MGO surfaces before painting or laminating

• Test adhesive compatibility on a small panel before full application

• Consider water-resistant or specialized finishes that bond better with MGO boards

• Consult the manufacturer’s guidelines to select compatible materials

By carefully choosing finishes and following proper preparation steps, builders can achieve smooth, long-lasting results without damaging the board.

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5. Inconsistent Quality Between Manufacturers

Why Quality Varies

One of the most overlooked mgo board problems is the variability in quality between different manufacturers. Factors contributing to inconsistent performance include:

• Differences in raw material purity, especially magnesium oxide and chloride levels

• Variations in production processes and curing techniques

• Lack of standardized testing for moisture resistance and durability

Even boards that appear similar can perform very differently under the same conditions, which can be frustrating for builders relying on predictable results.

Risks of Using Low-Quality Boards

Using substandard MGO boards can lead to:

• Higher likelihood of moisture absorption and swelling

• Increased cracking or warping

• Faster corrosion of metal components

• Poor adhesion with finishes, affecting aesthetics

• Higher maintenance and replacement costs

Tips for Choosing Reliable Suppliers

To reduce the risk of quality-related problems:

• Source boards from reputable manufacturers with proven track records

• Request material test reports or certifications

• Inspect boards for uniform thickness, surface smoothness, and color consistency

• Order sample panels before committing to bulk purchases

By prioritizing quality and working with trustworthy suppliers, builders can avoid many long-term headaches and ensure their projects meet high standards.

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Final Thoughts: Choosing MGO Board Wisely

While MGO boards offer excellent fire resistance, strength, and eco-friendly benefits, they are not without challenges. Understanding the top 5 MGO board problems—moisture absorption, metal corrosion, cracking and warping, limited finish compatibility, and inconsistent quality—can help builders make informed decisions and avoid costly mistakes.

The key to maximizing the benefits of MGO boards lies in careful selection, proper installation, and adherence to manufacturer guidelines. Choosing boards with low chloride content, using corrosion-resistant fasteners, ensuring correct storage, and testing finishes are all practical steps to minimize risks.

If you want to ensure your project avoids these common issues, contact our team today. We provide high-quality MGO boards, technical support, and guidance to help you achieve safe, durable, and visually appealing results every time.