Can Wet Fiberglass Insulation Be Dried and Reused?

Fiberglass insulation works by trapping tiny air pockets to resist heat flow. When it gets wet, these pockets fill with water, compromising its thermal performance. The batting also tends to compact and sag, creating gaps and voids. Even if the material feels dry later, it will not return to its original insulating R-value, leaving your home less energy efficient.

If the insulation was saturated by contaminated flood water, sewage, or long-term leakage, it is considered a biohazard and must be removed. Water from a clean source, like a supply line break, still warrants a professional assessment. Local water damage pros use equipment to determine moisture levels in surrounding wood and drywall. This assessment often dictates that the insulation be removed to prevent secondary damage and protect your home's structure.

• Saturation from a Category 2 or 3 water source (grey or black water).
• Evidence of existing mold growth on or near the insulation.
• Wetting of the paper or foil vapor barrier facing.
• Insulation that has sagged, collapsed, or left gaps.
• Moisture readings showing high levels in adjacent framing.
• A musty odor emanating from the wall or attic cavity.

The cost to remove and replace wet insulation often ranges from several hundred to a few thousand dollars. It depends on the water source, size of the affected area, and accessibility. If the damage is sudden and accidental, your homeowner's insurance may provide coverage for remediation. Policies vary, and your insurer decides what is covered. Documenting the damage thoroughly is a critical first step.

• The size of the affected area (square footage).
• The accessibility of the space (attic, wall, crawlspace).
• The type and contamination level of the water.
• Whether surrounding materials like drywall also need repair.
• Local disposal fees for construction debris.
• The cost of the new insulation material to be installed.