Insulated Concrete Form (ICF) walls offer above-code wind + impact resistance
FEMA P-2325 §Florida Building Code / Sand Palace lessonsDescription
Insulated Concrete Form construction (continuous concrete walls cast inside permanent foam-insulation forms) provides higher wind, impact, and fire resistance than conventional wood framing for coastal residential construction. Cost premium is typically 15-20% of structural cost, or less than 10% of overall construction cost.
Why this exists
The Sand Palace's owner reported 15-20% structural-cost premium for ICF + above-code detailing, recouped many times over by minimal repair cost after Hurricane Michael. ICF is one of the most consistently-cited above-code wall systems in MAT reports.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
structuralCostPremium | max | 20 | % | Typical structural-cost premium vs. wood frame |
overallCostPremium | max | 10 | % | Typical overall construction-cost premium |
Categories
Source
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Plan symbols this applies to
These plan symbols invoke this directive when placed on a floor plan. Click any to see where it's drawn and what other rules apply to it.
Related directives
- Continuous load path from roof to foundation · HUD RSDG §2.4
- Residential structural reliability targets 1-in-100 to 1-in-1000 annual probability of failure · HUD RSDG §2.5
- Residential floor live load: 40 psf minimum (30 psf sleeping rooms) · HUD RSDG §3.4
- Wind load design uses ASCE 7 basic wind speed for the locality · HUD RSDG §3.6
- Ground snow load for Virginia: 25 psf eastern, up to 40 psf western mountains · HUD RSDG §3.7
Last reviewed 2026-05-11.