in general, blown-in cellulose insulation, surprisingly, is not found moldy." Both fiberglass and rockwool insulation (inorganic materials) have been tested. In the rockwool insulation tests showed enough nutrients to keep mold spores alive, probably from dust in the mineral fibers.

What happens if blown in insulation gets wet?

When the fibers become wet to an excessive level, their weight increases, and the material will slowly compress and settle. The more your cellulose insulation compresses, the more it will expose parts of your wall or attic, greatly reducing the effectiveness of your insulation.

What is the life expectancy of blown in insulation?

In energy auditing, the useful life of blown in insulation (both fiberglass and celulose) is typically estimated to be 15 years.