Upgrading your attic insulation is one of the smartest moves you can make to improve home comfort and cut down on energy bills. But when it comes to choosing the right material, the options can feel overwhelming. There are several different types of attic insulation, each with its own pros, cons, and ideal use cases.

In this guide, we’ll break down the most common attic insulation types and help you determine which one best suits your home, climate, and budget.

Why Attic Insulation Matters

Your attic is one of the biggest sources of heat loss in the winter and heat gain in the summer. Without proper insulation, warm air escapes through the roof in cold months, and unwanted heat seeps in during summer. That makes your HVAC system work harder—and your energy bills climb higher.

Choosing the right insulation type is essential for maintaining a consistent indoor temperature, improving energy efficiency, and even preventing issues like condensation and mold.

1. Fiberglass Batt Insulation

Fiberglass batts are one of the most widely used types of attic insulation, especially in older homes. These pre-cut panels are made from fine glass fibers and are available in various R-values to suit different climates.

Pros:

• Affordable and widely available
• Easy to DIY in open attic spaces
• Non-combustible and mold-resistant

Cons:

• Gaps can occur around joists and irregular framing
• Less effective in air sealing
• Can lose effectiveness if compressed or poorly installed

Best for: Attics with standard joist spacing and minimal obstructions.

2. Blown-In Fiberglass or Cellulose

Blown-in insulation—whether made from fiberglass or cellulose—is installed using a machine that blows loose-fill material across the attic floor. It’s ideal for adding insulation over existing layers or filling irregular spaces.

Pros:

• Excellent coverage in tight or awkward areas
• Fast installation by professionals
• Can be layered for increased R-value

Cons:

• Requires special equipment
• Can settle over time, reducing effectiveness
• May not block air leaks unless paired with air sealing

Best for: Attics with lots of obstructions or existing insulation that needs supplementing.

3. Spray Foam Insulation

Spray foam is one of the most energy-efficient types of attic insulation available. Applied as a liquid, it expands into foam, filling every crack and gap to create a tight thermal and air seal.

There are two main kinds:

• Open-cell: Softer and offers sound dampening
• Closed-cell: Denser, water-resistant, and has a higher R-value

Pros:

• Highest insulation performance per inch
• Doubles as an air and moisture barrier
• Long-lasting and won’t settle

Cons:

• Higher upfront cost
• Requires professional installation
• May require code-specific fire barriers

Best for: Homes in extreme climates or attics with HVAC systems or ductwork.

4. Rigid Foam Board

Rigid foam boards are panels made from polystyrene, polyisocyanurate, or polyurethane. They’re commonly used in new construction or attic remodels.

Pros:

• High R-value per inch
• Durable and moisture-resistant
• Ideal for sloped ceilings or cathedral-style attics

Cons:

• Time-consuming to install in irregular spaces
• Needs to be sealed at seams for full performance
• May be more expensive than batts or loose-fill

Best for: Homes undergoing renovations or attics being converted into livable space.

5. Mineral Wool (Rock Wool)

Mineral wool is made from natural stone and slag, offering excellent fire resistance and soundproofing.

Pros:

• Fire-resistant up to 1,800°F
• Good sound absorption
• Water-resistant and mold-resistant

Cons:

• Slightly more expensive than fiberglass
• Less commonly stocked at big-box retailers

Best for: Homeowners concerned with fire safety or noise control.

How to Choose the Right Attic Insulation

To choose between these types of attic insulation, consider the following:

• Climate: Colder climates require higher R-values. Spray foam or high-density batts might be better suited for northern zones.
• Existing insulation: If you’re layering over old material, blown-in may be the most cost-effective.
• Budget: Fiberglass batts and blown-in cellulose are more affordable; spray foam has a higher cost but greater long-term savings.
• Air sealing needs: If your attic is drafty or houses ductwork, spray foam may be worth the investment.
• DIY vs. Professional: Some materials (like fiberglass batts) are DIY-friendly, while others (like spray foam) require professional expertise.

Don’t Forget Air Sealing

Regardless of which types of attic insulation you choose, air sealing is a must. Insulation alone won’t stop drafts from recessed lights, plumbing vents, or attic hatches. Make sure your contractor includes air sealing in your overall plan for maximum efficiency.

When to Upgrade Your Attic Insulation

If your home was built before 2000 or your attic insulation looks flat, dirty, or uneven, it may be time for an upgrade. Some key signs include:

• Uneven room temperatures
• High energy bills
• Ice dams on your roof in winter
• Drafts or cold ceilings

For the best results, schedule an inspection with a qualified insulation professional. They can assess your current setup and recommend the best types of attic insulation for your specific needs.

Ready to Make the Right Choice?

Now that you know the different types of attic insulation, you can make a more informed choice about which one fits your home. Each material has its place depending on your goals, layout, and climate. Want expert advice and professional installation? Reach out to Attic Nerds today and take the first step toward a more comfortable, energy-efficient home.