What actually happens on your roof during an SPF installation — and what it means for your building's operations while we work.
Reviewed by Allstate Spray Foam Roofing — updated July 2026
Every installation starts with the free assessment: drone survey, physical inspection, moisture scan, and core samples where warranted. From that we produce a written spec — foam thickness for your target R-value, coating system and thickness, drainage corrections, and detail work at penetrations — plus a firm bid within 48 hours.
| Step | What Happens | Typical Duration |
|---|---|---|
| 1. Prep | Surface cleaned (usually pressure-washed or air-blown), wet insulation removed, loose materials secured. Existing roof usually stays — no tear-off | 1 day |
| 2. Masking | Walls, units, and adjacent surfaces protected from overspray; wind screens set as needed | Hours |
| 3. Foam application | Two-component foam sprayed in controlled passes, expanding and curing in seconds. Slope built into low spots to fix ponding | 1–3 days for most commercial roofs |
| 4. Coating | Silicone base coat applied over cured foam, then top coat (with granules where specified) to full spec thickness | 1–2 days |
| 5. Inspection | Thickness verifications, adhesion checks, and final walkthrough with photos | Hours |
SPF is the most installer-sensitive roof system there is: ratio, temperature, pass thickness, and coating coverage all determine whether you get the 50-year outcome or an early failure. We've been spraying for 20+ years as SPFA members, fully licensed (Lic #C-2-1052735). Read more on how SPF systems work or check typical costs.
Free assessment — drone survey, core sampling where needed, and a written bid within 48 hours, anywhere in Fresno and the Central Valley.
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(559) 739-9519