Silicone Roof Coating Costs: What You'll Pay Per Square Foot

Silicone roof coating is one of the most cost-effective commercial roofing investments available. Here's a complete breakdown of costs.

Base Cost by Substrate

Over TPO or EPDM: $2.00–$4.50/sq ft. Over metal: $2.50–$5.00/sq ft. Over modified bitumen: $2.50–$4.00/sq ft. Over spray foam (recoat): $1.00–$2.50/sq ft.

Warranty Tier Cost Difference

10-year warranty (20 mils): $2.00–$3.50/sq ft for coating material and labor. 15-year warranty (25 mils): $2.50–$4.00/sq ft. 20-year warranty (30+ mils): $3.00–$5.00/sq ft. The thickness difference between tiers adds approximately $0.50–$1.00/sq ft per 5 mils.

What Adds to Base Cost

Wet insulation removal: $0.50–$2.00/sq ft per affected area. Seam and flashing prep: $0.25–$0.75/sq ft. Primer on specialty substrates: $0.25–$0.50/sq ft. Roof complexity: 10–25% premium.

Real Project Examples

30,000 sq ft EPDM roof, 15-year warranty, 10% wet insulation: approximately $80,000–$120,000. 75,000 sq ft metal roof, 10-year warranty, minimal prep: approximately $185,000–$300,000.

Compared to Replacement

Silicone coating at $2–$5/sq ft vs. replacement at $7–$14/sq ft — restoration is 50–70% less expensive for qualifying roofs. The economic case is overwhelming for most aging commercial roofs.