Maintenance Guides / Garage & Systems

Inspect attached-garage firewall & self-closing door

Difficulty: easyTime: 30 mins

Why it matters

IRC requires 5/8-inch Type X drywall and a 20-minute self-closing door. This is the only barrier between a car fire and the house.

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How to do it

  • 1

    Inspect the drywall separating the garage from the house (firewall).

  • 2

    Verify it is 5/8-inch Type X (fire-rated) drywall, not standard 1/2-inch.

  • 3

    Check the door between garage and house for automatic self-closing.

  • 4

    Open the door and release it; it must close completely on its own.

  • 5

    Inspect the door seals and weatherstripping for gaps or damage.

  • 6

    Look for unsealed penetrations (pipes, wires) through the firewall.