Fire separation is one of the most critical safety features in any home. According to national statistics, approximately 6,600 garage fires start each year, resulting in 30 deaths and 400 injuries. Because garages frequently house vehicles, fuel, and combustible chemicals, these fires tend to spread faster and cause more damage than any area except the kitchen. Here is what you need to know to ensure your garage meets vital safety standards.
When assessing your home’s safety, inspectors focus on the critical “fire barrier” system. The barrier serves a dual purpose: blocking or resisting the spread of fire and preventing carbon monoxide gas from entering the living space. The system relies on 3 core components: the shared wall, the door assembly, and any penetrations.
1.The Shared Wall: Your Unseen Protector
The adjacent or shared wall between the house and garage must be of sufficient strength and thickness to withstand heat and slow down a fast-moving fire.
- Building codes require a minimum of ½ inch drywall applied to the garage side of the shared wall. This is in addition to the drywall applied to the house side. If there is a living space above the garage, the garage side ceiling must have a minimum of 5/8th inch Type X Fire Rated drywall which gives a 1 hour resistance.
- All materials used on this barrier must pass strict regulations regarding their Flame Spread Index (FSI) and Smoke Developed Index (SDI) to ensure they don’t fuel the fire or create blinding, toxic smoke.
- There can’t be any unsealed openings, holes, or damaged sections of drywall on the shared wall. Even a small breach makes the barrier useless.
2.The Entry Door: More Than Just a Threshold
The door leading from the garage into the house is one of the most common places where fire barriers fail. The door and its assembly must meet strict requirements:
- The door must have an official 20-minute fire-rated label, or it must be a solid-core wood door or steel door that is at least 1-3/8 inches thick.
- Be aware that doors with deep decorative grooves or recessed panels reduce the thickness. Without a visible 20 minute fire-rated label, an inspector cannot verify its safety and must flag it.
- Doors with windows or view ports are rarely fire rated. Without an official fire-rated label, they should be automatically be flagged.
- The door must be equipped with automatic closers that allow the door to fully latch from a half-open position. The most common type of automatic closers are spring loaded hinges. That way, the door cannot be left open accidentally.
- A complete weatherstripping seal is required around the door. This prevents deadly carbon monoxide (CO) from an idling vehicle from seeping into your home’s breathing air.
3.Utility Boxes: The Hidden Vulnerability
Inspectors examine plumbing and electrical penetrations on the shared wall, as these often create accidental pathways for fire and gas.
- Most popular plastic access boxes are not fire-rated wall openings, such as the plastic PEX plumbing manifolds. Specific rules can be followed to make these air-tight or metal, fire-rated boxes can be installed.
- Laundry utility boxes are also plastic and can compromise fire safety, even on the inside of the home.
While there are many specific rules for the shared wall, understanding these fundamental requirements keeps you safe. If you notice a missing door closer, a cracked piece of drywall, or an unlabeled door on the shared garage wall, addressing it immediately is a small investment that can save lives.
We value your safety – take a moment to inspect your garage barrier today!