How much thicker is R-60 than R-19?

R-60 typically requires considerably more depth than R-19. For blown cellulose or loose-fill fiberglass, R-60 often means on the order of 16–24 inches of material, while R-19 in batt form fits a 2x6 cavity (about 5.5–6.5 inches depending on product). Exact thickness varies by insulation type and manufacturer; consult product R-per-inch charts. Use the Department of Energy's insulation guidance to compare R-per-inch for specific materials and estimate the depth you’ll need for your chosen product (Insulation | Department of Energy).

Can I add blown-in insulation over R-19 batts?

Yes. Adding blown-in cellulose or fiberglass over existing batts is a common DIY retrofit and can be an efficient way to raise total attic R without removing existing material. Make sure the existing batts are not compressed and that you avoid blocking soffit vents—install baffles where needed to keep ventilation paths open. When layering, follow manufacturer instructions about vapor retarders and mixed-material interactions; see guidance from industry sources (for example, the Insulation Institute PDF on layering techniques) for best practice (DOE Releases New R-Value Recommendations (BI491.pdf)).

Is R-60 worth it for a mild climate?

In mild climates, R-60 rarely pays back quickly. Most energy savings are captured by going from low R to moderate R (for example R-11 or R-19 up to R-30–R-38) and by sealing air leaks. Use the insulation savings calculator to model local energy prices and climate impacts before committing to R-60. If you’re pursuing comfort with limited heating loads or aiming for a passive-house standard, consider continuous exterior insulation and airtightness rather than only increasing attic R to R-60.

Will higher R-values cause moisture problems?

High R alone doesn't cause moisture issues, but changing where insulation is placed (for example, moving insulation or converting vented attic to unvented assembly) can alter vapor and condensation dynamics. Proper vapor control, ventilation, and attention to local climate matter. The EPA and other sources provide guidance on moisture and mold prevention; assess assemblies in the context of your climate and consult local building code or a building-science professional for complex situations. For crawlspace and foundation moisture issues that may interact with insulation choices, see the site's recommendations on how to fix damp crawl spaces.

What should I do first: air-seal or add insulation?

Air-sealing should come first. Stopping uncontrolled infiltration reduces heating and cooling loads more cost-effectively than simply adding more insulation. After sealing major leaks (top plates, penetrations, attic hatch, ducts), add insulation to reach your target R. The site's air sealing tools page lists materials and methods appropriate for DIYers. After sealing and insulating, validate results with a blower door test if possible; that provides measurable feedback and helps prioritize follow-up work.

R-19 vs R-60 Insulation: Which Do You Need?

R-Value Comparisons

Compare R-19 and R-60 insulation for attics, walls and budgets—practical guidance to choose the right R-value for your DIY eco build.

By Graham Mann | Published: 6/25/2026

R-19 vs R-60 Insulation: Which Do You Need? Choosing between R-19 and R-60 insulation is a practical trade-off of space, budget, and climate for DIY eco builders. This article on r19 vs r60 insulation compares where each R-value makes sense—walls vs attics, typical material choices, installation effort, and when higher R is or isn’t worth the extra cost and embodied material. Read on for clear, scenario-based guidance and links to tools and government guidance to help you estimate payback and sizing. TL;DR: - R-19 is usually suitable for 2x6 wall cavities and mild-climate attics; it's low-cost, easy to install, and widely available. - R-60 is primarily an attic strategy using deep blown cellulose or multi-layer systems; it cuts winter heating loads in cold climates but needs more depth, careful air-sealing, and ventilation. - For most DIY projects, prioritize air-sealing first, then add insulation to regional targets (use the insulation savings calculator); choose R-60 when attic depth...

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