In the selection of building insulation materials, "vapor permeability" is an important parameter that influences the waterproofing and durability of buildings directly. So, is rock wool vapor-permeable? The answer is rock wool has very high vapor permeability.

Why is rock wool vapor permeable?

Rock wool is made by melting natural minerals such as basalt at very high temperatures and then forming a fibrous structure by centrifugal force, so that inside of it there exist countless tiny and interconnected voids and holes. Such structural features determine that rock wool is an open-cell fiber insulation material.The molecular diameter of the water vapor is so small that it easily can pass through this kind of open-cell structure. When the water vapor is generated inside the building structure-for example, by indoor living activities-it can smoothly penetrate the rock wool layer and spread outward without being blocked in the insulation layer or inside the structure.

What are the benefits of high vapor permeability in buildings?

Effectively moisture-proof and mold-proof: High vapor permeability means that the water vapor inside the structure can be discharged in time and avoid condensation water accumulation inside the wall or roof. It fundamentally avoids the decline in performance of insulation material due to moisture, the corrosion of the structure, and mold growth.

Provide a healthy indoor environment: it keeps the building structure dry and creates a healthy and comfortable indoor living space. As a result, rock wool can prevent respiratory diseases caused by damp air.

Protection of the building structure: long-term dry structure can significantly prolong the service life of buildings by keeping them safe and stable.

Conclusion Conclusion: rock wool is not only an excellent thermal insulator but also a functional product with high vapor permeability. While offering effective insulation for buildings, it plays an important role in "breathing" to meet the dynamic balance of moisture inside the wall. Proper combination and application of highly vapor-permeable rock wool with waterproof vapor barrier layers in design and construction provide keys to building efficient, durable, and healthy buildings.

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