Choosing the Right Home Insulation: A Practical Guide

Fiberglass Batts and Rolls: Common & Cost-Effective

Fiberglass insulation, often seen as pink or yellow rolls and pre-cut batts, is a highly common and relatively affordable choice. It's made from spun glass fibers and is typically installed in unfinished walls, floors, and ceilings between studs or joists. Fiberglass batts offer an R-value (a measure of thermal resistance) of about R-2.9 to R-3.8 per inch. While suitable for many DIY projects, ensure proper ventilation and use protective gear (gloves, mask, eye protection) during installation to avoid skin and respiratory irritation.

Blown-In Insulation: For Existing Walls & Attics

Blown-in insulation, available in cellulose (recycled paper products treated for fire resistance) or loose-fill fiberglass, is ideal for filling irregular spaces, existing wall cavities, and attics. Cellulose typically offers an R-value of R-3.2 to R-3.8 per inch, while loose-fill fiberglass ranges from R-2.3 to R-3.8 per inch. It's particularly effective for retrofitting older homes without tearing down drywall, as it can be dense-packed into cavities through small holes. Professional installation is often recommended to achieve optimal density and coverage.

Spray Foam: High Performance & Air Sealing

Spray foam insulation, available in open-cell and closed-cell varieties, offers superior thermal performance and air sealing capabilities. Open-cell foam (R-3.5 to R-3.9 per inch) is less dense and expands significantly, while closed-cell foam (R-6.0 to R-7.0 per inch) is denser, rigid, and provides structural reinforcement and moisture resistance. Both types expand to fill every void, creating an effective air barrier that significantly reduces drafts and heat loss. Due to the specialized equipment and safety precautions required, spray foam application is always a job for licensed professionals.

Next Steps for Your Home's Insulation

• Inspect your attic: Look for uneven insulation, gaps, or areas where insulation is compressed.
• Check wall and floor cavities: Use an outlet or switch cover to peek into a wall cavity if you suspect poor insulation.
• Seal air leaks: Before adding insulation, seal gaps around windows, doors, and utility penetrations with caulk or weatherstripping.
• Calculate R-value needs: Research recommended R-values for your climate zone and specific areas (attic, walls, floor).
• Consider professional assessment: A home energy audit can pinpoint exact areas needing improvement and recommend solutions.

DIY Air Sealing Essentials

As an Amazon Associate, HearthIQ earns from qualifying purchases.

Common questions