Attic Insulation

Adding insulation to your attic or your loft? Choose from Owens Corning or Rockwool the best insulation to get a nice finished attic insulation. Need expert advice? Call 786 224 0029 or send us a message Here - Read Our Guide

  1. 1
  2. 2
  3. 3
  4. 4

  1. 1
  2. 2
  3. 3
  4. 4

Attic Insulation Guide

Attic insulation is the easiest way to improve your house’s energy efficiency.  Proper attic insulation helps regulate indoor temperature. It prevents heat loss in cold climates and retains cool air in warm climates. You could get an energy audit but a quick inspection of your attic is usually a good indication of what needs to be done. Then it’s time to get your DIY hat on. A couple of days work is all it takes to install batts or loose-fill insulation. 

Types of Attic Insulation 

Fiberglass batts, cellulose, loose-fill fiberglass, and spray foam are common types of attic insulation. 

Blanket Insulation: Blanket insulation comes in rolls or batts. It is available in cotton, cellulose, mineral wool, and fiberglass. Blanket insulation is ideal for unobstructed attics. It is easy to cut and install which explains its popularity with DIYers. 

R-value (inch)

  • Cotton ⇨ 3.7-3.8
  • Cellulose ⇒ 3.7-3.8

  • Mineral Wool ⇒ 3.0-3.3

  • Fiberglass ⇒ 2.9-4.3

Loose-Fill Insulation: Also a favorite for DIYers, this is a good option in attics with obstacles or little headroom (cross-beams and vents). It comes in mineral wool, cellulose, and fiberglass. 

R-value (inch)

  • Mineral Wool ⇒ 3.0-3.3

  • Cellulose ⇒ 3.2-3.8

  • Fiberglass ⇒ 2.2-2.7

Sprayed Foam Insulation: Spray Foam Insulation requires hiring a contractor and leaving the building for 24h while it's being sprayed. The jury is still out on the pros & cons of this type of insulation, but on paper, it’s a great way to insulate the attic given its superior R-values (up to 6.5 per inches with closed-cell and 3.5 per inch for open-cell). 

Both types of sprayed foam insulation provide an efficient air barrier and closed-cell sprayed foam insulation can serve as a vapor barrier. 

Both open and closed cells are made with polyurethane. Closed-cell foams are filled with gas, which expands the foam to fill the spaces around it. In contrast, open-cell foams are filled with air that gives a spongy texture to the insulation. You can find out more about this material on our Spray Foam guide

R-value for an Insulated Attic

The minimum target R-value goes from R-30 in hot climates to R-49 in old climates. You can visit the US Department of Energy’s website to find out the recommended R-value for an insulated attic based on your location. 

Basically, the R-value is the thermal resistance of the insulating material. The higher the R-value the more efficient the insulation is.  

To achieve the desired R-value, you should multiply the R-value per inch of your insulation until you reach the ideal R-value.  So to get R-36, with an insulating material of R-3 per inch, you will need 12-inch insulation material, and so on. 

Benefits of Attic Insulation

On average, cooling and heating account for 50 to 70% of the energy used in an average American home. The consensus among insulation experts is that you can save 15% on cooling and heating costs by air-sealing your house and insulating areas such as floors, crawl spaces, and attics. 

Prevent gradual damage:

It prevents your home from gradual damage caused by moisture and heat. prevents air and water from seeping in – which protects your walls against erosion. Not only does it slow down heat buildup in the attic, but it also increases your roof lifespan by preventing cracking and swelling. 

Savings on heating costs:

By boosting your attic insulation from R-11 to R-49, you can save up to $600 per year, which means it will pay for itself in less than 2 years if you go DIY.

 Improve air quality:

With the passage of time, dust, dirt, mold and other pollutants can accumulate in your home through air leaks as a result of poor insulation. By installing insulation in your attic, you will prevent these environmental pollutants from accumulating in your home and maintain cleaner air quality. 

Regulate natural heat flows:

In a home that is equipped with state-of-the-art cooling and heating systems, you can have serious temperature fluctuations if not insulated properly. The difference in temperature between floors can be unpleasant. Since most bedrooms are located on the upper floors, attic insulation is the best way to make sure the temperature doesn’t drop suddenly at night as well as in the early morning.

Do it yourself

With Blanket and Loose-fill insulation, you can save on the cost of hiring a professional. Watch the video below from our excellent friends at This Old House.


Try to locate and fix the air leaks first. If you can’t get an auditor, you can use a thermal camera to determine the cool spots up in the attic. Check the around the usual suspects: windows, pipes, fans, flues, and chimneys.

Inspect your attic to find out what insulation, if any, is used. In most cases, replacing is better than fixings. You can always lay new insulation on top of the old one, but make sure to check that there’s no stain, mold, or that the insulation is not compressed. If that is the case, get rid of it.

Inspect the roof for leaks, there’s no point in insulating an attic if there’s water getting in. 

Make sure floors lights are not in contact with the insulation, you don’t want to end up toasted either.  

Attic insulation on Insulation4US

All the major US brands stock attic insulation, including Owens Corning, Rockwool, and R-max. There are many other shops and online stores where you can find insulation material for attics. But none offers a one-stop for all approach where you can quickly compare and choose the material or type of insulation you need, filter by size and thickness until you find the one that bests fits your needs. But the most important is that we always provide the best value on the market. If you want quality at the best price then Insulation4US is where you will find it.

Top Brand Insulation At Affordable Prices

Join the CLUB for new products announcements, discount codes, and more!
Join The Club!

Back to top