How Long Does Blown In Cellulose Insulation Last

How Long Does Blown In Cellulose Insulation Last?

Installing new insulation or upgrading existing insulation is a sizeable project so it is natural to want to know how long the blown in cellulose insulation will last.

Blown in cellulose insulation will last anywhere from 20 to 30 years under ideal conditions. There are many factors that affect the lifespan of blown in cellulose which is why you need to make sure that it is installed professionally from the beginning.

Factors Affecting Life Span of Blown in Cellulose Insulation

Attic Insulation Toronto has decade’s long experience in the industry and has amassed a lot of knowledge and experience to overcome these potential problems.

Existing Air Leaks

The process of installing blown-in cellulose insulation properly begins long before the material itself is even fed into the machine. Cellulose is effective in regulating heat transfer via conduction but not so much where there are direct air leaks. Installing the cellulose before first sealing all the air leaks means that the air continues to flow. These air leaks are also extremely difficult to detect once the insulation is installed. This situation limits the effectiveness of the insulation as far as energy efficiency is concerned.

This isn’t a problem as long as the air leaks are identified in advance and sealed appropriately. Our technicians have the expertise to perform this step satisfactorily which can be hard to do without the proper training and experience. This one of the many reasons we discourage DIY installation.


Blown in cellulose is a fluffy material that settles with time. In fact, cellulose has the highest rate of settling rates at anywhere between 13 and 20 percent after installation. This settling continues over the weeks, months and years after installation and can cause severe energy efficiency issues if not addressed properly during the insulation.

Fortunately, this is an easy problem to overcome by simply adding more insulation than is needed to account for the settling. Despite cellulose high settling rate, it still offers a higher R-value per inch of thickness than the alternatives. This settling is simply not a good enough reason not to install cellulose.


Cellulose blown in insulation is primarily made from recycled newsprint and therefore more susceptible to moisture damage. A major leak in the attic can seriously affect the material’s ability to do its job properly.

This insulation, however, has great fire and water resistant qualities so save for a major leak, you shouldn’t be too concerned about moisture damage. Still, you need to regularly check your roof and attic for moisture problems especially after a storm or harsh weather.

Our technicians do all they can to make sure that the attic is sufficiently water and moisture proof before installation and may make additional recommendations depending on the state of the attic.

Why You Should Have Blown In Cellulose Insulation Installed Professionally

Watching experts at work installing blown-in cellulose may look like a simple job and often it is. There are many obvious and subtle considerations that may escape the layman including heat transfer through walls, types of lights in the attic space, whether or not the chimney is properly insulated (if it passes through the attic) and many more considerations. The installation itself is the simple part. An expert’s wealth of knowledge, experience and equipment is irreplaceable if you want to get the most energy efficiency and a long life out of your insulation.

Attic Insulation Toronto guarantees that the installation is done right from the very beginning and you can begin to recoup your investment in energy savings within the shortest time possible.  Call us now: 647-931-6385