A Lightning Strike Can Leave the Roof Looking Fine

A lightning strike often leaves a roof that looks almost intact from the driveway. The shingles may still be in place and the gutters may run straight, and the only sign is a small black mark on one ridge cap or a line of granules knocked loose down the slope. The damage that matters sits underneath, where a bolt following a wet path through the framing can split a rafter, char the roof decking, or start a smolder that does not show until the next day. If a storm has passed over your house and you suspect a strike, the first concern is safety, the second is a dated record, and the repair comes after both.

Safety comes before the roof

If you smell smoke, see scorch marks inside a room, or notice a hot or crackling area near a light fixture, leave the house and call the fire department from outside. Do not go into the attic to look for a glow. A strike can leave a smoldering point inside a wall cavity or along a rafter for hours, and a ladder is not the place to find it. After the fire service clears the house, have a qualified electrician check the electrical service before anyone switches the main breaker back on, because a surge can damage a panel even when nothing visibly burns.

What a strike leaves on the roof

Lightning tends to find the highest point of a house, the chimney, or the metal of a vent or ridge line, and it moves from there toward the ground along the easiest path. On shingles that path can look like a narrow, blackened streak running down the slope, sometimes with a few shingles blown off in a line. The metal vent hood, the chimney cap, and the flashing around them often show the first damage: a bent collar, a melted seam, or a cap knocked off its base. Check the gutter and downspout too. Where a bolt jumps to a gutter, the downspout strap or the ground connection can tear loose, and the wall beside it can show a scorch line running down to grade.

From the attic side the picture is different. Look for a split or pale fracture along a rafter or truss, black char on the underside of the roof decking, and a scorched path where the strike crossed the framing. A strike can split a rafter without moving a single shingle, which is why a roof that looks fine from the ground may still need structural work. Photograph everything from inside with a tape measure in the frame, and do it before anyone touches the framing.

Lightning, hail, and wind leave different marks

Homeowners often confuse a strike with hail or wind, and the difference matters for the record. Hail leaves round dents in soft metal such as gutters, vent hoods, and air conditioner fins, usually spread across the windward side of the house. Wind lifts shingle tabs and creases them at the nail line, often along the edges. A lightning path is narrow, can run in a straight line from a high point to the ground, and usually comes with burn marks or a fused fixture rather than a scatter of dents. Some storms bring more than one of these, so the record should note the date, the wind direction, and which marks belong to which event.

Insurance claim

Lightning is commonly a named peril in homeowner policies, but whether a particular strike is covered for a particular roof turns on the wording of your policy, not on what a roofer thinks. Missouri has no statute that settles this for you. Read the declarations page and the sections on the dwelling and named perils, and keep a copy with your photos. Your insurer decides how to evaluate the loss, and that conversation is yours to hold with them.

Missouri law (RSMo 407.725) forbids a roofing contractor from representing or negotiating a homeowner's insurance claim. A roofer in Missouri cannot speak for you to an insurer or an adjuster, and cannot promise what the insurer will pay. What a contractor can do is document the damage, write a scope with photos and measurements, and put that documentation in your hands. Keys does that, and attends as the contractor when the insurer's representative visits the house, while the claim stays with you and your insurer.

Keep the damaged pieces. A charred rafter section, a melted vent cap, and the shingles pulled from the strike line are evidence, and they should not go into the dumpster until your insurer has had a chance to see them. Repair the opening so water stays out, but set the removed pieces aside, bagged and labeled with the date and the location on the roof.

What it costs

The cost of a lightning repair depends on how far the strike reached. A shingle-only strike along a narrow line may need a few courses replaced and the flashing around a vent reset, which is a modest job. Once the decking is charred, the tear-off extends over that area and the decking is replaced back to sound wood, often with new blocking where a rafter has split. A split rafter may need sistering, which means a new board fastened alongside the old one, and the size of that board is usually set by a framer or an engineer. Replacement shingles from Keys are Atlas or Malarkey, and the bundle tag should be kept for the record.

The electrical work, any lightning protection system your house has, and any damaged appliances are separate lines, each with its own estimate. A house with a lightning protection system needs that system inspected by a qualified installer after a strike, because a conductor can come loose even where the roof looks clean. None of these figures are set in advance, which is why the written scope has to list each one with its own measurement and photo.

What to ask

Before you sign anything with a roofer after a lightning strike, ask for the answers in writing:

• Will the decking under the strike be photographed from the attic side before it is removed, with the char depth shown against a tape?
• Does the written scope list each split rafter or truss separately, with a measurement and a photo, or does it fold them into a general framing line?
• Who checks the grounding path and any lightning protection components, and is that a separate line on the scope?
• Where will the removed decking, rafter sections, and shingles be kept until your insurer has seen them?
• Who attends when the insurer's representative visits, and what documentation will you receive in advance?
• Does the scope show which repairs are for the strike and which were already needed before it?

Keys Roofing can be reached at (314) 220-2333 to set up a documented inspection of the strike line, with the written scope, photos, and measurements going to you.