Basic
$1.64 – $3.70 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
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 Fargo, North Dakota typically costs $1.93 to $4.35 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Prices in Fargo are 3.0% lower than the national average for polyisocyanurate insulation.
National average: $2 – $4.50 per sq ft
$1.64 – $3.70 per sq ft
1-1/2 in. foil-faced polyiso board (around R-9), fastened to the surface, seams taped
$1.93 – $4.35 per sq ft
1-1/2 in. foil-faced polyiso board (around R-9), fastened with cap fasteners, all seams taped with foil tape
$2.42 – $5.44 per sq ft
1-1/2 in. foil-faced polyiso board (around R-9), fastened, seams taped, edges and penetrations sealed with foam
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.87 – $1.95 | sq ft |
| Labor | labor | $0.68 – $1.54 | sq ft |
| Supplies & Other | supplies | $0.23 – $0.52 | sq ft |
| Equipment & Disposal | equipment | $0.15 – $0.35 | sq ft |
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 thisConnect with local polyisocyanurate insulation contractors in Fargo for personalized quotes based on your specific project.