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Attic Insulation: Blown-In vs. Radiant Barrier

When you need to add more insulation to your attic, you have a couple different options: blown-in attic insulation or radiant barrier insulation.

The OJ Insulation team installs both blown-in and reflective insulation in attics. Keep reading to learn more, or contact us to start your project!

Blown-in Attic Insulation

Blown-in attic insulation can be either loose-fill cellulose or a fiberglass blown-in blanket system.

Loose-fill Cellulose Attic Insulation

Cellulose insulation can be installed in attic floors and walls and offers superior soundproofing abilities. The way blown-in or loose-fill cellulose attic insulation works is by trapping hot air – it fits snugly behind walls, around pipes, wiring, etc. and leaves little to no air pockets.

Blown-In Fiberglass Attic Insulation

For attics, blown-in fiberglass blanket systems – like CertainTeed’s OPTIMA® fiberglass insulation – are often used. Like cellulose insulation, this type of attic insulation is installed in the floors and walls.

Blown-in Fiberglass Blanket Insulation

Blown-in attic insulation offers a number of benefits. It can:

  • Lower your energy bills
  • Reduce noises between different levels of your home (ideal if you use your attic as a bedroom)
  • Make your home more comfortable
  • Improve the overall efficiency of your AC
  • Help protect against water infiltration and moisture issues

Radiant Barrier Attic Insulation

Radiant barrier, or foil insulation, works a little differently. Radiant barrier attic insulation isn’t installed in the floors. It’s installed in the ceiling, below your roofing. Radiant barrier insulation works by helping your home reflect, rather than absorb, heat from the sun. Your roof absorbs all that energy and can get really hot (up to 150 degrees!), so you can imagine how much more comfortable a home with radiant barrier insulation is. Homes with foil insulation in the attic are approximately 10 degrees cooler than homes with no attic insulation. When it’s 85 degrees and sunny outside, this can make a huge difference!

Radiant Barrier Insulation in Attic

Radiant barrier attic insulation can:

  • Cut down on your energy costs
  • Make your home a lot more comfortable
  • Improve the performance of your air conditioner

Do you need attic insulators in San Diego, Los Angeles, or anywhere else in Southern California? Contact OJ Insulation! No matter which type of attic insulation you need to install – or if you need to install both – we’ll make sure it’s the right product for your needs.

Where should you insulate in your home? Check out our interactive infographic:

Home Insulation

We insulate attics, walls and crawl spaces.

Commercial Insulation

We insulate warehouses, offices, studio spaces & more.

Insulation Removal

Do you need to remove old insulation? We can help.


We work with builders to install fireplaces.

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