Costs for mineral wool and fiberglass insulation vary by material, thickness, and installation conditions. The main drivers are material price per square foot, required R-value, attic vs wall applications, and labor time. This guide provides clear cost ranges in USD to help builders and homeowners plan budgets for typical U.S. projects.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Mineral Wool Installed (per sq ft) | $1.50 | $2.10 | $2.50 | Residential batt or board installs; includes labor |
| Fiberglass Installed (per sq ft) | $0.70 | $1.15 | $1.30 | Batts or blown-in; varies by density |
| Material Cost (per sq ft, raw batt) | $0.75 | $1.25 | $1.60 | Mineral wool higher density |
| Labor Time (hours per 1,000 sq ft) | 4 | 6 | 9 | Includes setup and trimming |
| Total Project Range (attic, 1,000 sq ft) | $1,200 | $2,100 | $3,000 | Assumes standard 3.5–5.0 in insulation depth |
Overview Of Costs
Cost margins between mineral wool and fiberglass hinge on thermal performance, density, and installation type. Typical bids for a 1,000 sq ft attic vary from roughly $1,200 to $3,000, with fiberglass generally cheaper per sq ft and mineral wool offering higher R-values per inch. Assumptions: region, attic access, and existing joist layout.
Cost Breakdown
The following table breaks down common cost components for both materials. Assuming standard installation in a single-story home.
| Column | Mineral Wool | Fiberglass |
|---|---|---|
| Materials | $0.75-$1.60 / sq ft | $0.35-$0.85 / sq ft |
| Labor | $0.75-$0.90 / sq ft | $0.40-$0.70 / sq ft |
| Equipment | $0.05-$0.15 / sq ft | $0.05-$0.10 / sq ft |
| Permits | $0-$50 | $0-$50 |
| Delivery/Disposal | $0.05-$0.20 / sq ft | $0.05-$0.18 / sq ft |
| Warranty | Limited | Limited |
| Contingency | 5-10% | 5-10% |
What Drives Price
Key price drivers include density, R-value targets, and region-specific labor rates. Mineral wool generally commands higher material costs but offers better fire resistance and moisture tolerance, potentially reducing long-term energy and maintenance costs. Fiberglass tends to be cheaper upfront but may require higher thickness to reach the same R-value. Other factors are attic access, existing framing, and whether hatch sealing or air sealing is included.
Factors That Affect Price
Two niche drivers to note: insulation density and installation method. For mineral wool, densities of 3.0–4.0 pcf affect both price and soundproofing; for fiberglass, higher density (2.2–3.0 pcf) raises material cost and reduces airflow. R-value goals, region climate, and whether the project uses batt, board, or blown-in formats also shift the total price. Assumptions: climate zone, chosen product line, and thickness.
Ways To Save
Compared scenarios show meaningful savings when choosing fiberglass or optimizing installation time. Potential savings include opting for standard thickness instead of premium, combining with air sealing, and scheduling work in off-season periods. Bundling insulation with other retrofit work can lower per-project overhead.
Regional Price Differences
Prices vary by region due to labor costs and supply chains. In the Northeast, total installed cost may run 5–12% higher than the national average, while the Midwest often sits near the average. The South may see 0–8% lower pricing due to lower labor rates. Regional deltas reflect both material availability and skilled labor supply.
Labor, Hours & Rates
Labor typically drives the majority of installation costs. Typical crew rates range from $45 to $75 per hour per crew, with total labor time around 4–9 hours per 1,000 sq ft depending on attic complexity and access. data-formula=”labor_hours × hourly_rate”> Efficient crew coordination can shave hours and reduce total spend.
Additional & Hidden Costs
Hidden items may include odor-sealing or moisture barrier upgrades, advanced ventilation adjustments, and cleanup. For mineral wool, waste disposal can be slightly higher due to density. Expect 5–15% contingency to cover unexpected framing or joist work. Always verify final quotes include all related components.
Real-World Pricing Examples
Three scenario cards illustrate typical projects. All assume attic insulation work in a standard single-family home with no extensive air sealing beyond the scope described.
Basic: 1,000 sq ft attic, fiberglass batt, no blown-in; 4 hours labor; total $1,000–$1,400. Assumptions: standard 3.5 in depth
Mid-Range: 1,000 sq ft attic, mineral wool batt, attic hatch sealing included; 6 hours labor; total $1,800–$2,400. Assumptions: 3.5–4.0 in depth
Premium: 1,200 sq ft attic, mineral wool boards, added air sealing and vapor barrier; 9 hours labor; total $3,000–$3,800. Assumptions: higher density board forms
Assumptions: region, specs, labor hours.
