Basic
$1.94 – $4.38 per sq ft
1-1/2 in. foil-faced polyiso board (around R-9), fastened to the surface, seams taped
Photo: Sealle · CC BY-SA 4.0 · Source
How Much Does Polyisocyanurate Insulation Cost in Seattle, Washington?
Supply and install rigid polyiso foam board insulation (1-2 in, foil faced) on walls, roof deck or basement, with taped seams and fasteners.
Polyisocyanurate Insulation in Seattle, Washington typically costs $2.29 to $5.15 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Polyisocyanurate Insulation in Seattle, Washington
$2.29 – $5.15
per sq ftPrices in Seattle are 19.0% higher than the national average for polyisocyanurate insulation.
National average: $2 – $4.50 per sq ft
What you get at each price level
Standard
$2.29 – $5.15 per sq ft
1-1/2 in. foil-faced polyiso board (around R-9), fastened with cap fasteners, all seams taped with foil tape
Premium
$2.86 – $6.44 per sq ft
1-1/2 in. foil-faced polyiso board (around R-9), fastened, seams taped, edges and penetrations sealed with foam
Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.95 – $2.11 | sq ft |
| Labor | labor | $0.92 – $2.10 | sq ft |
| Supplies & Other | supplies | $0.25 – $0.56 | sq ft |
| Equipment & Disposal | equipment | $0.17 – $0.37 | sq ft |
Prices adjusted for Seattle local market conditions.
Polyisocyanurate Insulation photo examples
Foil-faced polyiso boards butted at a corner showing the cream foam core
Photo: Sealle · CC BY-SA 4.0 · Source
Find a pro to do thisFoil-faced polyiso boards laid with rebated edges meeting at a right angle
Photo: Sealle · CC BY-SA 4.0 · Source
Find a pro to do this
Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($0.91-$2.03 per square foot)
- Labor ($0.69-$1.57 per square foot)
- Supplies & Other ($0.24-$0.54 per square foot)
- Equipment & Disposal ($0.16-$0.36 per square foot)
Local Price Adjustments
Material costs4.0% above avg
Labor costs34.0% above avg
Labor costs in Seattle run proportionally higher than materials, which may favor material-heavy solutions.
Frequently Asked Questions
References
- Polyisocyanurate Rigid Foam Insulation Price 2026, One and Done Prep, oneanddoneprep.com, retrieved Nov 2026
- Cost of Polyiso Insulation, Frontier Foam, frontierfoam.com, retrieved Nov 2026
- Construction wages by metro and rural area, used for the labor adjustment by ZIP code, U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025
- Regional price parities for goods, used for the materials adjustment by ZIP code, U.S. Bureau of Economic Analysis, 2024
Get Free Estimates in Seattle
Connect with local polyisocyanurate insulation contractors in Seattle for personalized quotes based on your specific project.