Insulation Comparison Guide

Open-Cell vs Closed-Cell

✔ Open-Cell Spray Foam

Soft, flexible, lightweight foam that expands up to 100× its size.

Best for:

• Attics
• Interior walls
• Sound control
• Bonus rooms
• New construction

Pros:

• Exceptional air sealing
• Great soundproofing
• Lower cost than closed-cell
• High energy savings
• Expands to fill every cavity

Cons:

• Not ideal for metal buildings or crawl spaces

• Not a moisture barrier

✔ Closed-Cell Spray Foam

Dense, rigid foam with one of the highest R-values of any insulation.

Best for:

• Metal buildings
• Barndominiums
• Garages
• Crawl spaces
• Exterior walls

Pros:

• Air barrier + vapor barrier
• Highest R-value per inch
• Stops condensation
• Adds structural strength
• Ideal for humid Texas conditions

Cons:

• Higher cost
• Firmer texture, less sound absorption

⭐ Spray Foam Summary

Spray foam outperforms all other insulation types in comfort, efficiency, durability, and moisture control.
It’s the leading choice for Texas homeowners who want long-term performance.

2. Fiberglass Batt Insulation

The “standard” used in most builder-grade homes.

Best for:

• Interior walls
• Budget builds
• Non-critical areas

Pros:

• Low upfront cost
• Quick installation

Readily available

Cons:

• Does NOT air seal
• Loses effectiveness with moisture
• Attracts dust and pests
• Often poorly installed
• Can sag, compress, or fall out over time

⭐ Batt Summary

Batt insulation is cheap and easy — but offers poor performance in Texas climates.

3. Blown-In Fiberglass Insulation

Often used in “top-off” attic upgrades.

Best for:

• Attic floors
• Budget-friendly upgrades

Pros:

• Can help increase R-value
• Affordable
• Better coverage than batts

Cons:

• Still no air sealing
• Can shift or settle
• Does not stop heat radiating into attic
• Easily affected by humidity

⭐ Blown-In Summary

Useful for homeowners wanting a simple attic upgrade, but not a full efficiency solution.

4. Cellulose Insulation

Recycled paper-based insulation treated with fire retardant.

Best for:

• Older homes
• Existing walls

Pros:

• Eco-friendly
• Good density
• Better air resistance than fiberglass

Cons:

• Absorbs moisture
• Can lead to mold growth
• Heavy, can settle significantly
• Messy to install

⭐ Cellulose Summary

Performs slightly better than fiberglass but worse long-term than spray foam. Not ideal for humid climates.

5. Radiant Barrier

Shiny foil-like material installed in attics.

Best for:

• Supplemental attic upgrades
• Homes with extreme solar exposure

Pros:

• Reflects radiant heat
• Helps reduce attic temps
• Good add-on for hot, sunny climates

Cons:

• NOT insulation
• Zero R-value
• Does not seal air leaks
• Benefits vary based on installation quality

⭐ Radiant Barrier Summary

Useful as an upgrade, but should not replace insulation.