Insulation Guides for Houston Homeowners

R-values, cost breakdowns, material comparisons, and what to know before calling a contractor — written for Climate Zone 2A.

R-Value & Climate

October 7, 2026

What R-Value Does a Houston Attic Need?

Houston attics need R-38 to R-49 per DOE guidelines for Climate Zone 2A. Most homes built before 2000 have R-11 to R-19. Learn how to check your current level, what each target means in inches of blown-in insulation, and what it costs to upgrade.

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More guides coming soon: signs your attic needs insulation, blown-in vs spray foam for Houston, and open-cell vs closed-cell spray foam in Climate Zone 2A.

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