How Is a Garage Fire Different From a House Fire?

Fire can spread from a garage to the house through several pathways. A common attic space, ductwork, or a door left open provides a direct route for flames and superheated gases. The fire may also travel through shared walls or electrical conduits, reaching living spaces before you are aware of the danger. This spread is a major reason garage fires are uniquely dangerous.

Containing a garage fire is often more difficult. The large, open space and typical lack of interior walls allow flames to move freely. The garage door may fail early, providing extra oxygen that intensifies the blaze. This combination can lead to a fast-moving fire that challenges initial efforts to control it.

• Flammable liquids pool and create flashover conditions.
• Stored vehicles add rubber, plastic, and fuel to the fire.
• Chemical reactions from mixed substances can cause explosions.
• The materials used in shared walls may not resist fire as well as those in living areas.
• Often fewer smoke detectors are present in garages.
• The door to the house may not be a self-closing fire door.

Water used to extinguish the fire causes significant secondary damage. In a garage, this water can flow into a basement or crawlspace, soaking stored items and the concrete slab. It can also seep under walls into the home's foundation, leading to hidden moisture problems that promote mold growth. Quick water removal is essential.

The concrete floor in a garage does not absorb water, so pooling is a major issue. This standing water needs to be extracted quickly to prevent it from migrating. Local climate conditions, such as humidity, can affect drying times and mold risk. Proper drying techniques are needed for concrete and the surrounding structure.

• Concrete slabs trap moisture and require specialized drying.
• Metal tools and stored items rust rapidly when wet.
• Water can damage electrical systems in vehicles and openers.
• Pooled water may leak into a sub-slab drainage system.
• Chemicals in the water create a hazardous runoff situation.
• Heavy firefighting equipment can crack the garage floor.