How Does Lightning Strike a Home and What Gets Damaged?

A direct lightning strike hits the highest point of a structure, like a roof peak, chimney, or metal antenna mast. The immense electrical current seeks a path to the ground, often traveling through wiring, plumbing pipes, or structural metal. This direct path can vaporize materials, blow apart roof sections, and ignite fires in attics or walls where building materials are present.

A side flash occurs when lightning strikes a tall object near your home, like a tree, and then jumps to your house. This jump, or side flash, can breach the building envelope at the eaves or siding. It then follows the same internal paths as a direct strike, damaging anything conductive it encounters along the way to the earth.

The extreme heat of a lightning channel, which can exceed 50,000 degrees Fahrenheit, can instantly ignite combustible building materials. Common fire points include attic insulation, wooden framing around a chimney, or roofing felt. These fires often start hidden within walls or enclosed spaces, making them difficult to detect and extinguish before they spread significantly.

The explosive force of superheated air from a strike can also cause structural damage. It can blow out chunks of roofing, siding, or brickwork from a chimney. Windows may shatter from the pressure wave. This breach in your home's exterior then allows rain to enter, compounding the damage with immediate water intrusion problems that require quick action.

• Roof decking and asphalt shingles burned or torn.
• Wooden attic rafters and trusses charred or cracked.
• Chimney masonry cracked or bricks dislodged.
• Siding or stucco blown off the exterior wall.
• Shattered window glass from the pressure shockwave.
• Melted electrical wiring within walls creating fire hazards.

First, ensure everyone is safe and check for signs of fire, especially in the attic and walls. If you smell smoke or see flames, evacuate immediately and call the fire department. Do not touch electrical appliances or light switches if you suspect damage, as they could be energized or pose a shock risk. Visually inspect your home for visible damage, water leaks, or the smell of burning plastic.

Contact your homeowner's insurance company to report the incident and begin the claims process. Policies vary, and your insurer decides what is covered. For water damage from burst pipes or fire suppression, local water damage pros can help with water extraction, drying, and preventing mold. For structural or electrical repairs, you will need qualified contractors, like electricians and roofers, to make your home safe again.