Fire-Damaged Homes and El Niño Rain: Protecting a Damaged Structure Before the Storms

A fire-damaged home takes on rain through the openings and weak points the fire left, so those openings must be covered and the inside dried before the storms arrive. As of the CPC’s 8 October 2026 discussion, NOAA says a strong-to-very-strong El Niño is likely through January to March 2027, with a chance above 83 percent. CPC’s 15 October 2026 seasonal outlook gives much of California a raised likelihood of above-normal precipitation for November through January. Impacts are more likely with an event this strong, though not guaranteed.

Why Rain Is a Second Loss on a Fire-Damaged House

Rain on a fire-damaged house hits materials already weakened, and in an unrepaired envelope they may hold moisture from the firefight or from earlier rain, so it can do more damage than the same rain on an intact house. Three things make the difference:

• Heat can weaken roof decking, sheathing, flashing and seals, and the weakness is not always visible.
• Firefighting water or earlier rain may still be inside walls, insulation and framing if the materials were never dried and verified. The firefight leaves its own water behind, a separate problem covered in water damage from firefighting; rain is the second water on top.
• A damaged house is usually closed up and unheated, so nothing inside dries.

The Palisades Fire started on January 7, 2025 and was fully contained on January 31, 2025. CAL FIRE’s damage inspections counted 6,845 structures destroyed and 975 damaged, and the damaged ones are the structures still standing with a shell the fire has compromised. Moisture is the clock. The EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth, which makes it the drying standard to hold any wet material to. For a house unrepaired since 2025, the open question is whether wet materials were ever dried and verified. The same logic applies to any burned house in West Los Angeles that comes into the rain season unrepaired.

Where Rain Gets Into a Fire-Damaged House

Rain on a fire-damaged house enters at the roof deck, flashing and penetrations, windows and doors, stucco and wall cracks, and attic vents, and several of those can look intact from the ground. Do not climb onto the roof to check. Fire can weaken decking and framing without visible signs, so inspect from the ground and, only if the building has been cleared for entry, from inside the attic. An opening on the rear or side of the house counts just as much as one facing the street.

• Burned or opened roof deck. What the fire or firefight does: can burn through sheathing or leave charred, weakened decking; crews may cut sections for ventilation. What to look for: daylight in the attic, charred or sagging roof sections, stained rafters.
• Flashing, chimney and vent penetrations. What the fire or firefight does: heat can warp metal and break the seals around penetrations. What to look for: lifted or distorted flashing, cracked sealant, gaps around the chimney and vent pipes.
• Window and door frames and seals. What the fire or firefight does: heat can distort frames and cook the seals, so a unit that looks fine no longer closes tight. What to look for: warped frames, brittle or missing sealant, gaps at the corners.
• Stucco, siding and the weather barrier behind it. What the fire or firefight does: heat can crack stucco and damage the weather barrier behind it. What to look for: new cracks, blistered or detached stucco, exposed barrier.
• Attic and soffit vents. What the fire or firefight does: heat and embers can damage vents, leaving openings the rain can blow through. What to look for: melted or missing vent covers, scorched screens, stains on the soffit.
• Hose and firefighter access openings. What the fire or firefight does: cut roof sections, broken glass and forced doors leave deliberate openings. What to look for: cut or broken panes, forced doors, holes in the roof or walls that were never closed.

The common thread is that the visible burn hole is only the obvious entry point. The hidden ones are the cracked seal, the warped frame and the damaged barrier, and rain finds those first.

Cover, Dry, Then Close: The Order That Matters

A fire-damaged house needs its openings covered first, its wet materials dried second and its walls closed last, because covering wet insulation or framing traps the moisture. Follow the sequence in order:

1. Confirm it is safe to be in the building, enter only if the building has been cleared for entry, and stay off the roof. A fire-damaged roof can be weaker than it looks.
2. Photograph everything with dates, inside and out, before anything is covered or moved.
3. Have a qualified contractor cover the roof and every opening, including the rear and side, with a temporary cover such as a tarp or a board-up, and do not climb onto a fire-damaged roof yourself. Treat it as a short-term measure. FEMA’s archived Operation Blue Roof guidance says that program’s sheeting is designed to last 30 days and recommends arranging permanent roof repairs within that time.
4. Find and dry the wet materials. Moisture readings tell you when a material is dry, not how it looks or feels.
5. Do not close walls or ceilings over wet insulation or framing until the readings say dry.
6. Keep receipts, and ask your insurer before discarding any materials.

The cover stops new water, and the drying handles the water already inside. Closing before the readings are dry is where a fire loss quietly becomes a mold problem. For a house unrepaired since 2025, ask whether the wet materials were ever dried and verified, because they may still hold moisture from the firefight or from earlier rain. Call 310-678-4345 to have the entry points found and the moisture mapped.

A House That Stood Versus a House Mid-Rebuild

A rebuild in progress is open to rain at its new windows, doors, decks and wall joints until the finishes close, so those openings should be tested before the walls are finished. A house that stood and a house mid-rebuild share the same rain but not the same weak points.

• What is exposed. House that stood damaged: an older shell with heat-weakened seals, flashing, stucco and decking. House mid-rebuild: new openings and joints that are not yet sealed or covered by finishes.
• What rain does. House that stood damaged: finds hidden weak points and soaks materials that are already damp. House mid-rebuild: enters at fresh windows, doors, decks and wall joints and wets framing and sheathing.
• What to check. House that stood damaged: roof, flashing, frames and stucco from the ground, plus the attic and ceilings from inside. House mid-rebuild: every new opening and transition, before the weather barrier and finishes hide them.
• What to do before finishes close. House that stood damaged: dry the wet materials and confirm with readings. House mid-rebuild: Absolute does ASTM E1105 water testing of installed windows, doors and similar openings, so a leak shows before the drywall and stucco cover it.

The difference matters because a leak found before the finishes close is often a sealant fix, while the same leak found after is often a demolition and repair job. For the area, see water damage restoration in Pacific Palisades.

Check After Every Storm, From the Top Down

A temporary cover on a fire-damaged house loosens with wind and rain, so check it after each storm, starting at the top floor and attic and working down. Use this checklist:

• Check the edges and fasteners of the cover from a safe spot on the ground.
• Look at top-floor ceilings and, if the building has been cleared for entry, the attic for stains or drips.
• Press the base of walls for soft drywall.
• Look for swollen trim around doors and windows.
• Note any musty smell, which signals moisture you cannot see.
• Look at light fixtures for water, and leave the power off at any wet one.
• Check for pooling at doors, and keep roof gutters clean, as the EPA recommends.
• Date-stamp new photos of anything you find.

Working top-down matters because water travels downward, so the first stain on the ceiling below is often the last place a leak shows.

What Absolute Checks on a Fire-Damaged House Before the Storms

Absolute finds the exterior entry point and maps the moisture inside, so the cover, the drying and the repair go where the water actually is. Cleaning smoke and soot and repairing a fire-damaged house is the core of our fire damage restoration work; the rain risk above is the part that has a deadline. On a fire-damaged house, that work looks like this:

• Thermal imaging and moisture mapping to find where water enters and where it has gone, with daily moisture readings kept to IICRC S500 guidelines while air movers and dehumidifiers dry the structure.
• ASTM E1105 water testing of rebuilt windows, doors and similar openings before the finishes close.
• Fire and smoke damage restoration for the rest of the loss.

Absolute specializes in finding and repairing leaks from exterior sources, which is why the entry point comes first. When Absolute does the work, the fee for a Basic or Detailed Inspection is credited toward the work. If water intrusion testing is needed after a Basic or Detailed Inspection, that testing fee is fully rebatable toward the total cost of the work. For the season-long plan, from inspecting the envelope before the rains to repairing a leak the rain exposes, see Super El Niño leak repair.

Call 310-678-4345 to find where rain will get in before the storms.

Frequently Asked Questions

Can I walk on my fire-damaged roof to cover it?

No. Fire can weaken roof decking and framing without visible signs, so a roof that looks sound can give way under your weight. Have a qualified contractor cover the roof, and inspect it from the ground and, only if the building has been cleared for entry, from the attic.

How long does a temporary roof cover last?

A temporary tarp or sheeting is a short-term measure, measured in weeks, not a repair. FEMA’s archived Operation Blue Roof guidance says that program’s sheeting is designed to last 30 days and recommends arranging permanent repairs within that time. Wind and rain loosen covers, so check yours after each storm.

Will rain cause mold in a fire-damaged house?

It can, because moisture is the driver and rain on an unrepaired house adds to any moisture the materials may still hold from the firefight or earlier rain. EPA guidance calls for drying water-damaged areas and items within 24 to 48 hours to prevent mold growth. For a house unrepaired since 2025, the open question is whether the wet materials were ever dried and verified. Rain on materials that may still be wet is how a fire loss turns into a mold job, as post-fire mold prevention explains.

Should I wait for the insurance adjuster before covering the house?

No. Cover the house to stop further damage, but photograph everything first, keep every receipt and ask your insurer before discarding any materials. Waiting leaves the building open to the next storm, and the cost of added water damage grows with each rain.