InterNACHI Wind Mitigation study materials
InterNACHI Wind Mitigation study resources

InterNACHI Wind Mitigation: Opening protection

InterNACHI Wind Mitigation · Work through your exam, one topic at a time.

All guide sections

Opening protection

All openings

Opening protection covers windows, exterior doors, garage doors, skylights, and other glazed openings. To earn the “all openings protected” category, every exterior opening must have an impact-rated product or approved shutter system. Look for Florida Product Approval numbers, Miami-Dade NOAs, or labels showing compliance with ASTM E1886/E1996 large-missile testing.

Verification

Check each unique opening type, not one sample. Photograph labels and the installed product. A panel shutter must have labeled approval; a screen or temporary plywood is not a rated system.

Worked example

A house has impact-rated windows and a rated garage door, but the rear sliding door has no protection. Because one exterior opening is unprotected, the “all openings” category is not met. The reasoning: the category is all-or-nothing; one gap defeats it.

Traps

  • Inspecting only windows and forgetting doors and garage doors.
  • Counting screens or shutters without labels.
  • Applying one label to every opening.
  • Missing skylights and gable vents.