loose-fill fiberglass insulation

Disadvantages of Loose Fill Fiberglass Insulation

While loose-fill fiberglass insulation is easy to install (just blow it in), it can also be challenging. It’s difficult to get even distribution throughout the roof. Trying to figure out the exact thickness is tough.

If not installed correctly, it can lead to gaps and voids in the insulation. These gaps can reduce the effectiveness of the insulation and create areas where heat can escape, leading to increased energy costs and reduced comfort in the building.


1) Loose-fill Fiberglass Insulation is Messy


Blow-in fiberglass insulation is very messy due to the way it is installed. The insulation is blown into the desired area using specialized equipment, which can create a lot of dust and loose fibers. The fiberglass fibers can become airborne and settle on surfaces, creating a mess that can be difficult to clean up.

Additionally, the installation process for blow-in fiberglass insulation can be more time-consuming than other types of insulation, which can further contribute to the mess.


2) Blows Around in the Roof


Another problem with blow-in fiberglass insulation is that it’s very light and in South Africa, our roof voids often aren’t sealed properly. When the wind picks up it blows the loose fill fiberglass insulation around in the roof. Often causing some parts of the roof to be over-insulated and other parts to be under-insulated. This is also a fire hazard because it could blow insulation over the downlight covers and onto a light.


3) Settling Over Time


Loose-fill fiberglass insulation will settle over time, which will reduce its effectiveness as an insulator. This settling occurs when the fiberglass fibers shift downward, creating pockets or gaps in the insulation. The result is an uneven distribution of insulation throughout the building or structure, which can lead to temperature fluctuations and energy inefficiency.

When settling does occur, it will be necessary to add additional insulation to compensate for the loss of effectiveness. In some cases, the old insulation may need to be removed and replaced with new insulation to ensure optimal performance. It is important to work with a qualified professional to determine the best course of action for addressing settling in loose fill fiberglass insulation.


4) Blow-in Fiberglass Compaction


Loose-fill fiberglass insulation can become compacted in areas, further reducing its insulating properties. Compaction occurs when the insulation is pressed down, reducing the amount of air trapped between the fibers. This air is essential for insulation, as it creates a barrier that slows down the transfer of heat.


5) Expensive to Remove and Dump


Removing loose fill insulation can be more difficult than removing roll-form insulation due to the way it is installed. Loose-fill insulation is blown into the desired area using specialized equipment, making it more difficult and expensive to remove. Additionally, loose-fill insulation can settle over time, making it more compact and harder to remove.

See our removal cost

Roll-form insulation, on the other hand, is installed in batts or blankets that can be easily removed by cutting or pulling them out of the wall or ceiling cavity. The process of removing roll-form insulation can be simpler and less time-consuming than removing loose-fill insulation. Conclusion

It is important to consider the downsides before choosing this type of insulation for your home or building. It may be worth exploring alternative insulation options that address these concerns.


We recommend sticking to roll-form insulation products like Knauf and Aerolite.