Should You Close Interior Doors During A Tornado -

Here’s a concise, evidence-based review on the question: Should you close interior doors during a tornado? The Short Answer Yes — you should close all interior doors (and open only those leading to a designated shelter space, if necessary). Closing interior doors helps compartmentalize the house, reducing the risk of wind and debris spreading from room to room. However, the most critical action is getting to a safe, windowless interior space on the lowest floor (basement, bathroom, closet).

Why Closing Interior Doors Helps

Reduces Pressure Differences Tornadoes cause extreme pressure drops. When a tornado breaches an exterior wall or window, the sudden pressure inside a single room can cause that room’s roof or walls to blow outward. Closed interior doors limit the volume of air that can rush in, reducing the force exerted on the structure.

Blocks Wind-Driven Debris If an exterior window blows out, wind and debris can travel through open doorways to other parts of the house. Closed doors act as temporary shields, confining destruction to the point of entry. should you close interior doors during a tornado

Slows Fire Spread Tornadoes often rupture gas lines or overturn candles; closed doors delay fire spread, giving more escape time.

Preserves Safe Zones Keeping doors closed to your shelter area (e.g., a bathroom or closet) prevents sudden pressure changes or debris from entering that space.

What About Opening a Door “To Equalize Pressure”? Myth. Decades of post-tornado engineering studies (including from NIST and the Red Cross) have debunked the idea that opening windows or doors equalizes pressure or prevents a house from exploding. Modern houses are not airtight enough for pressure to build explosively. Opening an exterior door during a tornado actually invites wind and debris inside, increasing damage and risk of injury. Here’s a concise, evidence-based review on the question:

Practical Guidelines

Close all interior doors before the storm hits, if time allows. Close and lock exterior doors — locking helps them resist wind pressure better. Open no windows or doors to “vent” the house. Your final shelter space (basement, interior bathroom, or closet) should have its door closed for maximum protection. Do not waste time running around closing doors if the tornado is imminent — seek shelter immediately. Closing doors is a preparatory step during a watch, not an emergency action.

Exceptions & Caveats

Mobile homes: Structural integrity is so low that closing interior doors has negligible benefit. Leave immediately for a sturdy shelter or storm cellar. Apartments on upper floors: Close your interior doors, but focus on getting to the lowest floor interior hallway (per building emergency plan). Houses with open floor plans: Fewer doors exist, but still close any that do.

Summary Table | Action | Recommended? | Why | |--------|--------------|------| | Close interior doors | ✅ Yes | Reduces pressure differentials & debris spread | | Open windows/doors | ❌ No | Invites wind & debris; no pressure equalization benefit | | Close & lock exterior doors | ✅ Yes | Helps them resist wind pressure | | Shelter door closed | ✅ Yes | Keeps the safe zone isolated |