Is the MgO board breathable?

 Yes, most MgO boards are breathable. In building science, "breathable" means a material allows water vapor to pass through it via a process called diffusion. This is measured by its water vapor permeance (or perm rating).

Why Breathability Matters

A breathable building material helps regulate moisture levels. When moisture accumulates inside a wall cavity from sources like cooking, showering, or even humidity, it needs a way to escape. If a wall is not breathable, that moisture can become trapped, leading to serious problems:

• Condensation: Trapped vapor can condense into liquid water.

• Mold and Mildew Growth: The presence of moisture creates a perfect environment for mold and mildew, which can cause health issues and structural damage.

• Reduced Insulation Performance: Wet insulation loses its effectiveness, leading to higher energy costs.

How MgO Boards Achieve Breathability

While MgO boards are highly resistant to liquid water (they won't swell or rot when exposed to it), their porous, mineral-based structure allows water vapor to move through them. This is a key difference from materials like traditional OSB, which can be sealed with coatings that inhibit moisture vapor from passing through.

It's important to note that the degree of breathability can vary between different MgO board products depending on their specific formulation and manufacturing process. Some manufacturers might add sealants or fillers to make a board more water-resistant, which can slightly reduce its perm rating.

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220