Homeowners commonly compare foam board and fiberglass insulation by price, installation effort, and performance. The main cost drivers are material type, thickness or R-value, site accessibility, and labor for installation. Cost differences show up in both per square foot and total project pricing.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Foam board material (polyiso or EPS) | $0.75 | $1.20 | $2.00 | Per sq ft, polyiso typically higher |
| Foam board installed (walls/attic) | $1.50 | $3.00 | $5.00 | Per sq ft; varies by thickness and labor |
| Fiberglass batt material | $0.40 | $0.75 | $1.25 | Per sq ft of coverage |
| Fiberglass batt installed | $1.00 | $2.00 | $3.00 | Per sq ft; includes compression and framing work |
| Total project cost (typical walls or attic) | $1.80 | $3.50 | $6.50 | Assumes standard 1,000 sq ft area |
Overview Of Costs
Costs vary by material and installation scope. Foam board often carries higher per-unit material costs but may reduce long-run energy losses. Fiberglass typically has lower material costs but may require more labor for proper air sealing and cutting to fit around obstacles. Assumptions: 1,000 sq ft area; standard wall cavities; attic or basement application as applicable. Assumptions: region, specs, labor hours.
Cost Breakdown
| Materials | Labor | Equipment | Permits | Delivery/Disposal | Warranty | Taxes |
|---|---|---|---|---|---|---|
| Foam board: $0.75–$2.00 / sq ft | $1.00–$2.00 / sq ft | $0.10–$0.50 / sq ft | Typically $0–$300 | $0–$100 | Limited (manufacturer) but optional | Varies by state |
| Fiberglass: $0.40–$1.25 / sq ft | $1.00–$2.00 / sq ft | $0.05–$0.30 / sq ft | $0–$200 | $0–$80 | Typical 10–20 years | Varies by state |
What Drives Price
Material R-value and thickness directly affect cost: foam board provides higher R per inch in many cases, but material costs rise with performance. Labor and access influence total pricing; tight retrofit spaces or intricate around electrical and plumbing can add time. Additional drivers include local codes requiring vapor barriers, and whether installation is DIY or contractor-led.
Factors That Affect Price
- Thermal performance requirements: higher R-values increase material cost
- Surface preparation: sanding, framing repairs, and moisture treatment
- Site access: crawlspaces and tight attics raise labor hours
- Moisture and mold considerations: may require extra vapor barriers or coatings
- Regional labor rates: urban vs rural markets
Ways To Save
Choose standard thickness when possible. Bundling insulation with other energy upgrades can provide savings. Seasonal pricing may affect contractor rates; off-season installations can be cheaper in some markets. Compare bids from at least two installers and verify local rebates or incentives.
Regional Price Differences
Prices vary by region due to labor costs and market competition. In the Northeast, installed foam board can run higher due to humidity concerns and fewer local suppliers. The Midwest often shows lower installed rates, while the West Coast may be higher due to transportation costs and higher wage levels. Typical regional deltas range from -10% to +20%.
Labor, Hours & Rates
Labor costs depend on the scope and complexity. Simple attic installs may require 6–12 hours, while full-wall retrofit in an older home could take 2–3 days. data-formula=”labor_hours × hourly_rate”> Typical hourly rates for insulation work run $40–$80 in many markets. Expect more time when cutting foam boards to fit around irregular framing.
Real-World Pricing Examples
Three scenario cards illustrate typical pricing. Assumptions: region, specs, labor hours.
Basic
Area: 1,000 sq ft attic, standard 3/4 inch foam board, basic sealing. Materials: $0.75–$1.00 / sq ft. Labor: 6–8 hours at $40–$60/hr. Total: $1,170–$2,000. Per sq ft installed: $1.17–$2.00.
Mid-Range
Area: 1,200 sq ft walls, 2 inch foam board with vapor barrier, tight fit. Materials: $1.50–$2.00 / sq ft. Labor: 14–20 hours at $45–$70/hr. Total: $3,900–$6,500. Per sq ft installed: $2.50–$5.40.
Premium
Area: 1,500 sq ft with mixed foam board and high-density fiberglass for corners, moisture zones. Materials: $2.00–$3.50 / sq ft. Labor: 25–40 hours at $65–$90/hr. Total: $9,000–$14,500. Per sq ft installed: $6.00–$9.70.
Assumptions: region, specs, labor hours.
