What makes a double-keyed deadbolt on an exterior door a safety finding?

A double-keyed deadbolt requires a key on both faces, which means the door cannot be opened from inside without one. During a fire that is a trap: occupants are moving in smoke and darkness, often disoriented and hurrying, and the key is wherever it was left. Egress requirements exist precisely because escape must not depend on locating a small object under those conditions — a door in the path of egress should open from the inside without a key, tool or special knowledge. The security argument that motivates these locks is real, since a thumb-turn can be reached through adjacent glazing, but the accepted remedies address that differently, through laminated or reinforced glazing or a lock kept unlocked while occupied. The inspector reports the double-keyed bolt as an egress concern regardless of whether a key currently hangs nearby, since its presence is not something anyone can rely on.

A door requiring a key from the inside means escape depends on finding that key during an emergency, in smoke and darkness. Egress doors are expected to open from inside without a key or special knowledge.

Doors in the path of egress are expected to open from the inside without a key, tool or special knowledge. Double-keyed deadbolts are installed for security where glazing is adjacent, and are reported as egress concerns.

Escape Should Not Need a Key. In smoke and darkness, a key on a hook is a key you will not find.

A key hanging beside the door does not resolve the finding. Report it as an egress concern and note the alternatives that preserve security.

• •Clearing the finding because a key is kept nearby
• •Treating the lock as a security improvement without noting the egress consequence
• •Framing it as an insurance rather than a life-safety issue