Many commercial HVAC systems have fiberglass insulation lining the interior walls of the ductwork to provide not only thermal insulation but also sound buffering for the unit’s operation. Most quality installations of insulation will last a long time if it maintained properly. However, there are situations where the insulation will break down due to variances in temperatures, air turbulence and humidity. If these compromised areas of insulation are not addressed and your commercial insulation repair is not taken care of, fiberglass particulates can enter the air flow, causing problems in the system and for the people inhabiting the space

Upon inspection during routine maintenance, inspect and evaluate the insulation’s condition. If it is exposed, unsafe or ineffective, it’s best to either replace the insulation or repair it through a process called encapsulation.


Sometimes the condition of the fiberglass insulation is so deteriorated that it just has to be replaced. The extent of the replacement can be determined by a professional air quality cleaning company. They can advise you about the extent of the damage and how much of the insulation needs to be replaced and not just repaired. They will also be able to consult with you on the type of insulation that’s best for your facility, especially if you’re experiencing insulation degradation more often than you should.


The surface of fiberglass insulation is coated with a sealant that helps keep the raw fibers in place. If the insulation begins to deteriorate, the coating can wear away or be missing entirely. In these cases, the most effective repair method is to encapsulate the fiberglass surface to return it to its encapsulated state. These repair coatings range from those that simply hold the fiberglass fibers in place to those that also coat with antimicrobial elements.

Considerations for insulation repair costs

An on-site inspection will be conducted by the air quality cleaning professionals in order to determine the extent of the insulation damage. In most cases, these inspections incur no cost.
The air cleaning pros will come back to you with a quote including the cost of materials based on the scope of the job. This would include detailed specs of the amount and type of insulation to be used in replacement situations.


Insulation costs can vary based on the grade of material chosen. Options include: basic contractor grade, better value grade, and superior top quality grade.

The labor costs to repair or replace your insulation will be included in your estimate. In most cases you should consider employing only those who are licensed/bonded or sourced by the builder.
The estimate should include all standard costs for supplies and tools used to unpackage, fit, secure and edge seal the insulation.
Be sure to understand whether or not the repair costs include any necessary structural repairs as well as the removal of discarded materials and debris.
The degree of difficulty with the repair job will also be factored in. Typical access and complexity jobs will run less than those with difficult or complex access such as many corners, multiple levels and non-rectangular shapes.
Duct insulation repair and replacement costs will vary by location but estimates from more than one company in your area should be in the same range.

Each ductwork situation is unique so there are no real standard costs for repairing and replacing fiberglass insulation. However, there are definite considerations involved in each situation and a professional air quality company will be able to advise you on the best methods to address the scope of your facility’s situation.