Glass wool is a good thermal insulation materials for most types of construction buildings and industry applications.

It is made from glass fiber which bonded together with the resin binder. Glass wool has excellent thermal insulation and sound acoustic insulation properties. So it used commonly in all over the world. Especially used for residential steel frame house and timber frame house. Because the vapour permeability of glass wool is a critical advantage performance, So that glass wool is not designed to get wet from liquid water.however many people asked, Can glass wool get wet? What happens if the glass wool explore to the water?

Can glass wool get wet?

The excellent thermal performance of glass wool comes from the millions of tiny air gaps between the fibers. These air gaps are the key to the insulation of glass wool. If these gaps are filled with water, its performance may be permanently damaged. Even if it dries, it loses its initial insulation effect. Therefore, even though glass wool has a certain degree of water repellent, it cannot be directly used in environments that are in long-term contact with large amounts of liquid water. This will greatly affect the insulation effect of glass wool.

What happens if the glass wool explore to the water?

If your glass wool insulation absorb plenty of water the persistent moisture can weaken wooden frame, rafters, and other structural elements in your loft, leading to costly repairs.

Second,glass wool explore to the water can create a suitable environment for mold and mildew grow. The mold and mildew growth not only affect the insulation performance but also are high risks for health.  

 So if your roof is damaged in a storm or other event and the glass wool batt insulation explored with water, you should have a professional insulation installer assess the damage.Remove the old glass wool insulation and install brand new glass wool ceiling batt with the correct R value.