A practical hurricane season mold prevention checklist for Florida homeowners: roof, AC, humidity, water intrusion points and what to do in the first 48 hours.
Hurricane season in Florida runs from June through November, but the mold problems it creates usually show up weeks after the weather clears. The storm itself is a few hours of wind and rain; the mold risk comes from the days afterward, when roofs are patched with tarps, power is out and the air conditioning that normally keeps your home dry is silent.
This checklist is organized the way a mold assessor thinks about a house: where water gets in, where it hides and how long it stays. Work through it before the first named storm, and keep the "after the storm" section somewhere you can find it without power.
The short version
Mold prevention during hurricane season comes down to three things: keep water out, dry anything that gets wet within 24 to 48 hours, and keep indoor relative humidity below 60 percent while the air conditioning is off. Everything below supports one of those goals.
Before the season: fix the entry points
Most storm-related mold in Central Florida homes does not come from floodwater. It comes from rain pushed sideways into small openings that never leak in a normal afternoon thunderstorm.
- Roof and flashing. Walk the perimeter and look for lifted shingles, cracked boots around plumbing vents and rust on flashing. Have a roofer address anything suspect while contractors still have open schedules.
- Window and door seals. Press on the caulk around windows, sliding doors and the garage door frame. Cracked or missing sealant is a direct path for wind-driven rain into the wall cavity.
- Weep holes and stucco cracks. Block construction with stucco is common across Orlando and Lake County. Hairline stucco cracks let water into the block, where it can sit for weeks.
- Gutters and downspouts. Clear them and make sure downspouts discharge away from the slab. Water pooling against the foundation wicks into interior walls.
- Grading and drainage. Confirm soil slopes away from the house and that French drains or yard drains are not clogged with mulch.
- Attic ventilation. Soffit vents packed with insulation or painted shut trap humid air against the roof deck.
If you have had a prior leak that was "fixed" but never verified dry, this is the time to confirm it. A water intrusion and damage assessment with thermal imaging and moisture meters can show whether the old leak left damp materials in the wall before the next storm adds to them.
Before the season: prepare the inside
Your air conditioner is your primary mold defense in Florida, and hurricane season is when it is most likely to be out of service.
- Service the AC. A clean coil, clear condensate line and correct refrigerant charge all help the system remove moisture, not just cool the air.
- Check the condensate drain. A backed-up drain pan during a storm, when the system is running hard, is one of the most common post-hurricane water sources we find.
- Buy a hygrometer. An inexpensive humidity meter in the main living area tells you when indoor conditions cross into mold territory. Aim for 30 to 50 percent, and treat 60 percent as the line not to cross.
- Stage drying supplies. Box fans, a wet vacuum, heavy plastic sheeting, towels and contractor bags are hard to find after a storm. A portable dehumidifier that can run off a generator is worth considering.
- Photograph every room. Date-stamped photos of walls, floors, ceilings and baseboards give you a "before" record that is useful for both insurance and any later assessment.
- Know your shutoffs. Water main, water heater and electrical panel. A broken supply line during a storm is a flood from the inside.
When a storm is approaching
In the 48 hours before landfall, your goal is to start the outage as dry and cool as possible.
- Run the AC a few degrees cooler than usual and let it pull humidity down.
- Move rugs, furniture and stored boxes off the floor in rooms along the exterior walls.
- Pull items away from exterior walls and out from under windows so you can see any water that comes in.
- Place towels at the base of sliding doors and garage doors, and check them after each rain band.
- Turn off the water heater if you are evacuating, and consider shutting the main water supply.
- Charge the hygrometer if it is battery powered, and move it somewhere you will see it daily.
After the storm: the first 48 hours
This is the part that decides whether you have a drying project or a mold project.
| Timeframe | What to do |
|---|---|
| Hours 0 to 6 | Walk every room with a flashlight. Check ceilings, window sills, baseboards, closets and the garage. Photograph anything wet before touching it. |
| Hours 6 to 24 | Remove standing water. Pull up wet area rugs. Move wet furniture outside or onto blocks. Open closet and cabinet doors. |
| Hours 24 to 48 | Get air moving across wet surfaces. If drywall or carpet padding is saturated and you have no power, plan for removal rather than waiting. |
| Day 3 and beyond | Anything still damp is now a mold candidate. Document it and bring in an assessor before a contractor closes it up. |
A few specifics that matter in Florida homes:
- Carpet padding holds water against the slab and almost never dries in place without professional equipment.
- Baseboards and the bottom few inches of drywall wick water upward. Discoloration often appears a few inches above the actual water line.
- Closets along exterior walls are the first place we find growth, because they have no airflow and often share a wall with a leaking window.
- Attics under a tarped roof stay humid for weeks. Insulation that got wet compresses and stays damp long after the ceiling below looks fine.
If you have no power, the house is essentially a closed, humid box. Open windows during the cooler, drier parts of the day and close them when the afternoon humidity climbs. Watch your hygrometer; if you cannot keep the reading below 60 percent, the clock on wet materials is running.
The mistakes that create mold after hurricanes
Over two decades of post-storm assessments across Central Florida, the same patterns keep showing up.
- Tarping the roof and forgetting the attic. The tarp stops new water but seals in the humidity already there.
- Painting over stains. Paint hides evidence and traps moisture in the drywall.
- Running bleach on everything. Bleach does little on porous materials like drywall and wood, and the water in it adds moisture.
- Letting a contractor close walls before they are verified dry. Once new drywall goes up, the moisture inside is trapped and the growth starts out of sight.
- Assuming a "dry" smell means a dry wall. Moisture meters routinely find wet studs behind drywall that reads normal to the touch.
Why an independent assessment matters after a storm
After a hurricane, every contractor in the region is busy, and some of the companies offering free mold inspections are the same companies selling remediation. Florida licenses mold assessors and mold remediators separately, and UES holds only the assessor side. We do not remove mold or dry buildings, and we do not take referral fees, so the findings in your report describe what is actually in the walls, not what generates a job.
A post-storm comprehensive mold assessment includes a forensic visual inspection, moisture mapping with thermal imaging, air and surface sampling sent under chain of custody to an independent accredited lab, and a written protocol that any licensed remediator can follow. If remediation is needed, a post-remediation verification confirms it was done correctly before you rebuild.
When to call UES
Call when you find a musty odor, staining or elevated humidity that will not come down after a storm, when materials have been wet for more than 48 hours, or when a contractor wants to close up walls that were never tested. We serve Orlando, Leesburg, Tampa and the entire state of Florida.
Book an assessment online or call (407) 438-4684, Monday through Friday, 9:00 AM to 5:30 PM.
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Frequently asked questions
How quickly can mold grow after a hurricane?
Wet drywall, carpet padding and wood framing can begin supporting mold growth within 24 to 48 hours of getting wet. That window is why drying and documentation need to start the same day the water arrives, not after the insurance adjuster visits.
Should I run my air conditioner before a hurricane hits?
Yes, as long as you have power. Cooling the house and lowering indoor humidity before the storm gives you a drier starting point if the power goes out. Once power fails, keep windows closed in the heat of the day and open them only when outdoor humidity is lower than indoors.
Do I need a mold assessment if my house did not flood?
Not always, but wind-driven rain, roof lifts and days without air conditioning can leave hidden moisture in walls and attics without any standing water. If you notice a musty odor, staining or persistent high humidity after a storm, an independent assessment with moisture mapping can confirm whether anything got wet.
Worried about what you just read?
An independent UES assessment tells you exactly what is going on, what caused it and what to do next. Book online or call.
