Is Mgo board water resistant?

 

MgO board is highly water-resistant, but it is not completely waterproof. This distinction is crucial for understanding its proper use in construction.

Water Resistance Explained

MgO board's high resistance to water comes from its mineral-based composition. The magnesium oxide and other compounds are inorganic, meaning they do not absorb moisture or provide a food source for mold and mildew. This is a significant advantage over materials like gypsum board or plywood, which can swell, warp, and rot when exposed to moisture.

Due to its water-resistant properties, MgO board is an excellent choice for applications in damp or humid environments, such as:

• Bathrooms and kitchens

• Basements

• Wet areas behind tiles

• Exterior sheathing (when properly sealed)

Limitations and Considerations

While it performs exceptionally well against moisture, direct and prolonged submersion can still cause issues. In some formulations, especially those with magnesium chloride, extended exposure to water can lead to a phenomenon known as "weeping" where chloride salts migrate to the surface. This can cause the boards to absorb a small amount of water and may corrode metal fasteners, so it is important to choose a high-quality product.

To achieve a higher level of water protection for exterior applications or areas with frequent direct water contact, MgO boards should always be:

• Sealed: A protective sealant or coating can be applied to the surface.

• Combined with a moisture barrier: For exterior walls, a weather-resistant barrier (WRB) is still recommended.

• Installed with non-corrosive fasteners: Stainless steel or galvanized screws are ideal to prevent rust and degradation.

In summary, MgO board is an excellent material for moisture-prone areas because it won't rot, swell, or support mold growth, but it should not be considered a substitute for a complete waterproofing system in applications that require it.

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