Best Insulation for Exterior Walls [Ultimate Guide]

Discover the most effective insulation options for your exterior walls. Learn how to enhance energy efficiency, reduce costs, and choose the best material for your home’s unique needs.
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Written by 
Dumitru Nicolaescu
Updated:
December 18, 2024

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Best Insulation Types for Exterior Walls

[Exterior Wall Insulation in Northbrook, Illinois]

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Fiberglass Batts

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Spray Foam Insulation

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Blown-In Cellulose

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Rigid Foam Board

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Mineral Wool (Rockwool)

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Best Insulation for Enclosed Existing Walls

[Wall Insulation in Palatine, IL]

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Optimal R-Values for Exterior Wall Insulation in Chicago

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Insulation Type 2x4 Walls (3.5" cavity) 2x6 Walls (5.5" cavity) Best For
Fiberglass Batts R-13 to R-15 R-19 to R-21 Budget-conscious homeowners
Blown-in Cellulose R-13 to R-15 R-20 to R-23 Retrofits, eco-conscious homeowners
Spray Foam (Open Cell) R-13 to R-14 R-20 to R-22 Air sealing, moisture control
Spray Foam (Closed Cell) R-21 to R-24 R-33 to R-38 Maximum R-value, moisture barrier
Mineral Wool Batts R-15 R-23 Sound dampening, fire resistance
Rigid Foam Board R-13 to R-15 (3" thick) R-22 to R-25 (5" thick) Continuous insulation, thermal bridging reduction

DIY vs. Professional Installation: Making the Right Choice

[Walls insulation from Exterior in Jefferson Park, Chicago]

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Conclusion: Investing in the Right Insulation for Your Chicago Home

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Frequently Asked Questions

1. How much does professional mold remediation cost?

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2. Can I just paint over mold?

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3. How quickly can mold grow in a crawl space?

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4. Will homeowners insurance cover mold remediation?

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5. Is it safe to store items in a crawl space?

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