Blown-In Attic Insulation Pros and Cons that Homeowners Must Know

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Blown-in attic insulation is the type of lumpy, dense, and thick insulation that’s usually created from fiberglass, cellulose, or other materials. It somehow has similar consistency to down feathers with ability to fit in narrow areas like between ducts and wires or between walls. It is called so because it involves the uses of “blowing” insulation machine into the attic sections, which commonly require you to insert large insulation block into the machine and then direct it to fill the insulated spots. Here are the blown-in attic insulation pros and cons that you need to know as a homeowner.

The Lists of Benefits and Drawbacks of Using Blown-In Attic Insulation

The primary benefits of blown-in attic insulation is the retained warm air during winter seasons and heat air sneaking in prevention from the outside during summer seasons. That being said, there are actually more benefits that you might have yet to be aware of, such as:

  1. Energy efficiency, because you don’t have to overwork your heater units and AC as the insulation helps to prevent heat to get inside during hotter days and the heat to escape during colder days. This will lead to lower energy bills as well
  2. Fireproof, as several insulation types such as fiberglass have this quality
  3. Quick and simple installation, if you are using a proper blower
  4. Soundproof, as the offered qualities of cellulose and fiberglass insulation
  5. Temperature control, which help to eliminate condensation in the attic

As you can see, there are a set of benefits you can get by using this type of installation. However, you should also consider the blown-in attic insulation pros and cons that will be explored in the lists below.


  • You can insert the blown-in attic insulation even in the narrowest area such as the space between AC units or heaters to create proper insulation system in your attic and take advantage of each inch of the attic space.
  • You can purchase and install this type of insulation at relatively affordable price without having to sacrifice the resistance of the insulation to create proper heat flow or the R-value
  • You can treat the insulations with borates to prevent your attic to be populated by vermin and insects
  • You can layer the blown-in attic insulation on top of the prior insulation system or to create support for the areas with existing insulation


  • You may require a help from professional since the installation system might be challenging, except if you are an experienced contractor
  • You may make the ceiling area sag if the insulation is overly concentrated in a single area
  • You need to install soffit venting and air seal carefully if required
  • You may have to cut and fit again the improperly installed laid batts and insulate the plumbing if you are using cellulose insulation on top of fiberglass one
  • You may make the area prone to rot and mold if your attic naturally has plenty of moisture and the insulation is exposed to it for an extensive time

Remember that it’s important to get your attic professionally inspected before you decide if it’s right to use this insulation type. An attic inspector will be able to explain more detailed blown-in attic insulation pros and cons according to your house’s special circumstances, besides identifying its issues.