Attic Insulation 101

The basics of Attic Insulation

The primary sources of air leaks in your house are frequently found in the attic, which can cause exorbitant energy costs and an uncomfortable living environment throughout the year. Fortunately, insulating and air sealing the attic is relatively simple, resulting in better home comfort, reduced energy expenses, and an enhanced overall energy efficiency.

How much Insulation do I need?

The effectiveness of insulation is quantified by R-values, where a higher value indicates superior resistance to heat transfer in walls and roofs. To determine the recommended R-value in a particular region, the U.S. Department of Energy (DOE) takes into account the local heating and cooling expenses as well as the climatic conditions. The map and chart displayed below present the DOE guidelines for insulation in Georgia. Some areas across the nation may impose R-value requirements lower than those suggested by the DOE, which are based on cost-benefit analyses.

Wall Insulation: Whenever exterior siding is removed on an

Uninsulated wood-frame wall:

  • Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding, and
  • Zones 3–4: Add R5 insulative wall sheathing beneath the new siding
  • Zones 5–8: Add R5 to R6 insulative wall sheathing beneath the new siding.

Insulated wood-frame wall:

  • For Zones 4 to 8: Add R5 insulative sheathing before installing the new siding.

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Types of Insulation

Although insulation can be made from a variety of materials, it usually comes in three types; each type has different characteristics.

Rolls and Batts or Blanket Insulation

are flexible products made from mineral fibers, such as fiberglass and rock wool. They are available in widths suited to standard spacings of wall studs and attic or floor joists: 2×4 walls can hold R-13 or R-15 batts; 2×6 walls can have R-19 or R-21 products.

Loose-fill insulation

commonly manufactured from fiberglass, rock wool, or cellulose, is available in shreds, granules, or nodules, which are then blown into cavities or attics utilizing specialized pneumatic equipment. The material quickly conforms to building cavities and is particularly effective in locations where other types of insulation would be difficult to install.

Spray Foam Insulation

very effective in buildings with space limitations and where higher R-values are needed. Foam insulation R-values range from R-4 to R-6.5 per inch of thickness (2.54 cm), which is up to 2 times greater than most other insulating materials of the same thickness.

These types of insulation are not all created equal! Understanding the differences in insulation type is an important component of the comfort of your home and safety.

Common Questions

Most Popular Questions.

In case your question is not included or if you have specific inquiries about your home and project, please feel free to reach out to us via phone. We’d be happy to assist you further.

Our area of expertise lies in attic insulation. We don’t undertake projects related to wall or crawlspace insulation.

Certainly! We’ll visit your home, assess its unique requirements, and offer you a complimentary estimate.

Absolutely! We can safely and efficiently remove and clean up your attic. It’s worth noting that we don’t offer pest control services. Please keep in mind that several pest control companies provide insulation removal services, but this may result in contamination.


Your new attic insulation will pay for itself within 2-3 years. We are so confident of that, we offer a written, money-back guarantee that your insulation will pay for itself in three years.


A complete window installation will pay for itself in seven years. Call us to learn more.


Although we don’t provide pest removal services, we strongly advise you to opt for a professional insulation company for your insulation removal needs. You can find further information about the potential drawbacks of selecting a pest control company for insulation removal on our page Insulation Removal.

Yes! All our installers are employees, and not sub-contractors. They have completed training, and take great pride in their craftsmenship.


Yes! All Tallahassee Spray Foam employees have undergone background checks and drug testing.