Sto High Velocity Hurricane Zone (HVHZ) Systems
Sto High Velocity Hurricane Zone (HVHZ) Systems provide a full range of exterior cladding options to protect against hurricane and tropical storm winds, water intrusion, and wind-borne debris: a leading cause of building envelope failure. All of Sto’s HVHZ Systems are fully engineered and tested, and compliant with the stringent Miami-Dade County, Florida criteria for wind load, impact resistance, air leakage, and water resistance. For optimal protection, Sto also offers a Level E impact rated system – the highest standard for hurricane protection in ASTM E1996. Level E is often required for essential facilities such as hospitals and emergency centers.
Our Hurricane Impact Systems
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Key Features of Sto HVHZ Systems
- Rainscreen, EIFS, Stucco HVHZ systems
- Fully tested and fire-resistance rated wall assemblies
- Lightweight and easy to install
- Field applied or prefabricated
- Wide range of aesthetic possiblities from glass, brick, wood, smooth fiber cement or plaster finish
- Compliant with Miami-Dade County or Florida Building Product Approval requirements
| System | System Type | Application Type | Large Missile < 30ft |
Small Missile > 30ft |
Design Pressure Rating (DPR) | Steel Gauge | NOA Number | Florida Building Product Approval | View System | Compare |
|---|---|---|---|---|---|---|---|---|---|---|
|
StoTherm ci GMG - LE (over glass mat gypsum sheathing) (Level E) 1,5,9 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ✅ | ✅ | +/- 110 psf | 16 gauge | FL47961.1 | |||
|
StoVentec Fiber Cement (over plywood) 3,7 |
Rainscreen | Field Applied | ✅ | ✅ | +/- 105 | 18 gauge | No NOA | FL47528.1 | ||
|
StoVentec Glass (over plywood sheathing, concrete or CMU) 4,8 |
Rainscreen | Field Applied | ✅ | ✅ | +/-70 to +/-100 | 18 gauge | 22-0606.05 | FL47006.10 | ||
|
StoVentec for Masonry Veneer Facades (over plywood sheathing, concrete or CMU) 4,6 |
Rainscreen | Field Applied | ✅ | ✅ | +/-80 | 18 gauge | 25.0610.02 | FL41659-R1 | ||
|
StoVentec Render (over plywood sheathing, concrete or CMU) 4,6 |
Rainscreen | Field Applied | ✅ | ✅ | +/-80 | 18 gauge | 25.0610.02 | FL41659-R1 | ||
|
StoPowerwall GMG - Structa Wire (with Structa Wire lath - over gypsum mat sheathing) 4 |
Stucco | Field Applied | ✅ | ✅ | +/-100 | 18 gauge | 25-0107.09 | TAS 201, TAS 202, TAS 203 | ||
|
StoPowerwall Drainscreen GMG (over gypsum mat sheathing) 4 |
Stucco | Field Applied | ✅ | ✅ | +/-100 | 18 gauge | 25-0107.07 | TAS 201, TAS 202, TAS 203 | ||
|
StoPowerwall GMG (over gypsum mat sheathing) 4 |
Stucco | Field Applied | ✅ | ✅ | +/-100 | 18 gauge | 25-0107.07 | TAS 201, TAS 202, TAS 203 | ||
|
StoTherm ci CMU (over CMU) 4,5 |
EIFS | Field Applied | ✅ | ❌ | -180 | N/A | 25-0107.03 | FL21034-R2 | ||
|
StoTherm ci Ply (over plywood sheathing) 2,3,4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ✅ | ❌ | +/-100 to +/-125 | 18 gauge | 23-0328.03 | FL21034-R2 | ||
|
StoTherm ci StoCast GMG-SM (over gypsum mat sheathing) 4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ❌ | ✅ | +/-112 | 18 gauge | 23-0707.04 | FL21034-R2 | ||
|
StoTherm ci StoCast GMG-LM (over gypsum mat sheathing) 1,4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ✅ | ❌ | +/-105 | 18 gauge | 23-0707.03 | FL21034-R2 | ||
|
StoTherm ci MVES GMG - SM (masonry veneer - over gypsum mat sheathing) 4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ❌ | ✅ | +/-112 | 18 gauge | 25-1117.03 | FL21034-R2 | ||
|
StoTherm ci MVES GMG - LM (masonry veneer - over gypsum mat sheathing) 1,4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ✅ | ❌ | +/-103 | 18 gauge | 25-1117.02 | FL21034-R2 | ||
|
StoTherm ci GMG – LM/SM (over gypsum mat sheathing) 1,4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ✅ | ✅ | +/-140 to +/-150 | 18 gauge | 25-0107.04 | FL21034-R2 | ||
|
StoTherm ci GMG – SM (over gypsum mat sheathing) 4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ❌ | ✅ | +/-120 , +/-140, and +/-150 | 16 gauge | 25-1205.02 | FL21034-R2 | ||
|
StoTherm ci GMG - LM (over gypsum mat sheathing) 1,4,5 |
EIFS, Prefabrication | Field Applied, Prefab (Sto Panel) | ✅ | ❌ | +/-120 to +/-150 | 16 gauge | 25-1205.02 | FL21034-R2 |
Notes
1. StoTherm ci LM or LE systems also meet small missile impact resistance criteria.
2. Wood studs permitted.
3. Some, not all Type III permitted. Consult local code and AHJ.
4. Refer to applicable Miami-Dade NOAs for complete information on listed assemblies.
5. Refer to ICC ESR-1748 for use in Types I-IV construction.
6. Refer to CCRR 0454 for use in Types I-IV construction.
7. Refer to CCRR 0600 for use as HVHZ system.
8. Refer to DrJ TER 2312-07 for use in Types I-IV construction.
9. Essential buildings (Level E) require a Large Missile Impact Resistant system above 30 ft.
