A Story from the Field: "The Water Never Reached the Bedrooms, So Why Is My Daughter Coughing?"

Beer and her husband live in a three-storey townhome in a housing project in Bang Phli, not far from Bang Na-Trat Road. They share it with their seven-year-old daughter, who has allergies, and her husband's mother, who is in her seventies. The ground floor is the living room and kitchen, the second floor has two bedrooms, and the third floor holds a small home office and a family shrine room.

During the October 2026 floods, water came into the ground floor to about mid-shin height and stayed for six days. The family carried what they could upstairs and lived on the second floor the whole time. Doors and windows stayed shut almost constantly because of the rain and the mosquitoes. When the water drained, the couple shovelled out the mud, threw away the sofa and the swollen cabinet under the stairs, and repainted the ground-floor walls. They assumed the problem had ended at the ground floor.

A week later Beer noticed white mold spots on the back panel of the built-in wardrobe in the second-floor bedroom. The curtains smelled stale. Her daughter's mattress felt damp at night, and the little girl started coughing and waking up with a blocked nose every morning. Upstairs, the shrine room, which had stayed closed throughout the flood, smelled like an old storeroom, and the cloth on the altar table had developed faint spots.

"The water never even came up to the bedrooms. Why is upstairs like this?" Beer asked the technician who came to look at the house. Her next question is one many townhome owners in Bang Phli are asking right now: "Do we need to treat the whole house, or is the ground floor enough?"

Note: this is an illustrative scenario based on problems commonly seen in townhomes after flooding. It does not refer to any news report or to statistics from any agency.

How Moisture Gets Upstairs When Only the Ground Floor Flooded

The staircase is the house's chimney. A townhome has an open staircase linking every floor. Warm, humid air from a ground floor that held water for days rises up the stairwell and collects in the upper rooms, especially when doors and windows are closed.

Everyone crowded onto one floor. During the flood the whole family lived upstairs: breathing, showering, drying laundry indoors and cooking simple meals. All of that adds moisture, while windows stayed shut most of the time.

Wet belongings were carried up. Boxes, clothes and household items that had already got wet were often stacked on the second or third floor. They became sources of moisture and mold spores in rooms the water never touched.

Walls wick water upward. Brick and plaster walls that soaked for days draw water higher than the visible flood line and keep releasing moisture for weeks. Townhomes sharing walls with neighbours on both sides also dry more slowly than detached houses, because there is less outside wall area for air to move through.

Built-in furniture and rooms nobody opened. The space behind wardrobes, the shrine room and storage rooms that were never opened during the flood are where air is most still. That is why mold usually starts there first.

What a Townhome Family Has to Deal With

Health

Bedrooms are where we spend the most hours each day. Mold spores and dust mites in damp mattresses, curtains and wardrobes can trigger coughing, sneezing, a blocked nose and wheezing, particularly in children with allergies and in older adults. The ground floor that sat in floodwater may also carry germs from contaminated water that cause diarrhea, and there is a risk of leptospirosis if mud touches cuts or broken skin. This is general information, not medical advice; if symptoms do not improve, please see a doctor.

Belongings

Built-in wardrobes, mattresses, clothes, books and the objects in a shrine room can be permanently damaged if mold is allowed to spread. Replacing them costs far more than dealing with the problem early.

Time and stress

Cleaning one room after another, again and again, while the smell keeps coming back is exhausting, especially for working parents who are also caring for a child and an older relative.

The hidden cost of a half-finished job

Treating only the ground floor can look like a saving, but if spores and odor remain upstairs, they drift back down the same staircase that carried them up. Many families end up paying twice: once for the ground floor, and again a few weeks later when the upstairs problem can no longer be ignored.

Assess Each Floor: What Each Level Needs

The simple rule: if the upper floors smell musty, show mold spots, or anyone in the house has started to have symptoms, treating the whole house is usually the better value, because the staircase connects the air on every floor. Treat only the ground floor and leave the upper floors as they are, and spores from upstairs can drift back down. If the upper floors are dry, odor-free, and no wet items were carried up, focusing on the ground floor may be enough.

It also helps to think about who uses each floor. In many Bang Phli townhomes the second floor is where children and grandparents sleep, so even a mild musty smell there matters more than the same smell in a storage room. On the other hand, a third floor that is mostly empty and well ventilated may need little more than airing out. A good assessment weighs three things together: how much moisture and mold is present, how sensitive the people using the room are, and how connected the room is to the rest of the house through the stairwell. That is the kind of judgement the survey is meant to provide, so that you spend money where it actually makes a difference.

A Ten-Minute Upstairs Check You Can Do Yourself

• Close a bedroom door for about half an hour, then open it and smell the air straight away. A clear musty smell is the first warning sign.
• Move the wardrobe slightly or shine a torch on the wall behind it and under the bed. Look for white, green or black spots.
• Open drawers and cupboards, smell clothes that have been stored for a while, and check for spots on fabric.
• Feel the mattress and pillows at night. If they feel unusually cool and damp, humidity in the room is high.
• Look at ceiling corners and window frames for droplets or ring-shaped stains.
• Pay attention to how people feel. If anyone is coughing, sneezing or congested more since returning home, give the bedrooms extra priority.

If two or more of these apply, the upper floors very likely need disinfection and ozone treatment along with the ground floor.

Fixes Many Families Try That Do Not Work

• Repainting the ground floor immediately: paint over damp walls blisters, mold grows underneath, and the upstairs problem is still untouched.
• Running the bedroom air conditioner all night: it removes some humidity, but if spores are in the room the AC simply recirculates them, and the AC coil can become a new source of odor.
• Wiping wooden wardrobes with bleach: it discolors wood, does not kill mold that has grown into the grain, and the fumes irritate children and older adults.
• Air fresheners in every room: they mask the smell for a while but do nothing about the cause.
• Cleaning one room per day: rooms already cleaned get spores again from rooms not yet done, carried through the open stairwell.

Getting the House Ready the Day Before

Preparation makes a real difference to the result. A day or two before the appointment, work through this list:

1. Remove anything from the ground floor that is swollen, crumbling or covered in mold and cannot be saved, such as particle-board cabinets and soaked mattresses.
2. Shovel out remaining mud, wash floors, and leave windows open on dry days.
3. Have an electrician check ground-floor sockets and the distribution board before you rely on power downstairs.
4. Wash curtains, sheets and pillowcases from the upper floors, and dry them fully in the sun.
5. Pull wardrobes and beds a little away from the walls so air and treatment can reach behind them.
6. Decide where the family, including grandparents, children and pets, will spend the treatment day, for example with relatives nearby.
7. In the shrine room, respectfully move Buddha images and delicate offerings, or prepare clean cloths to cover them.
8. Let neighbours who share your walls know the date, so they are not surprised.

The WHD Solution: Whole-Townhome Disinfection Fogging and Ozone Treatment in One Day

World Health Disinfection (WHD) provides an ozone treatment service and a disinfection fogging service for flood-affected houses and townhomes in Bang Phli, Bang Sao Thong, Mueang Samut Prakan and nearby areas. The team assesses each floor and plans the work so the whole house is finished in a single day, which stops spores from one floor drifting back into another.

Disinfection fogging uses CHEMGENE HLD4H through an ultra-low-volume (ULV) fogger, working from the top floor down. The fine droplets reach behind wardrobes, under beds, beneath the stairs and into bathroom corners.

Ozone treatment uses an ozone generator positioned so the gas spreads through every floor via the stairwell, or applied one floor at a time depending on the size of the house. Ozone penetrates curtains, mattresses and wardrobes, breaking down musty odors and acting on mold spores.

How the service works

1. Floor-by-floor survey. Mold spots, materials to remove, and rooms that need special care, such as the shrine room, are identified.
2. Preparation advice. Remove damaged items, clean out mud, wash bedding and curtains, and have the ground-floor electrics checked.
3. Disinfection fogging. From the top floor down to the ground floor.
4. Whole-house ozone treatment. Doors and windows closed; nobody, no pets and no plants inside.
5. Ventilation. Windows on every floor are opened so air flows up through the stairwell until there is no ozone smell.
6. Follow-up. The family notices how bedrooms smell at night and on rainy days, and tells the team if anything returns.

10 Reasons Bang Phli Townhome Owners Choose WHD

1. Each floor is assessed on its own; nothing is lumped together or overdone.
2. The whole house is finished in one day, reducing cross-contamination between floors.
3. CHEMGENE HLD4H is used on surfaces on every floor.
4. Ozone treatment reaches curtains, mattresses and built-in wardrobes.
5. Shrine rooms and sacred objects are handled with respect.
6. Preparation advice in the right order saves time and money.
7. Suitable for homes with allergic children and older adults; see ozone disinfection for homes.
8. Dust mite removal is available for mattresses and sofas.
9. Ozone treatment for chemical residue odors after repainting.
10. Easy to reach by phone and LINE.

What Townhome Owners Tell Us

"We thought that since only the ground floor flooded, only the ground floor needed work. Once the team explained that the staircase is how moisture and spores get upstairs, it made complete sense. We did the whole house in one day, our daughter's room smells much better, and now we know to open the upstairs windows regularly."
- Townhome owner in Bang Phli (illustrative field scenario)

Special Rooms Need Special Care: Shrine Room, Home Office and a Child's Bedroom

The shrine room

For many Thai families the shrine room is the most important room in the house, and it is often on the top floor and kept closed. After a flood, that combination of stillness and humidity is exactly what mold likes. Before treatment, respectfully invite the Buddha images, amulets and offerings out of the room, or cover them with clean cloth. Altar cloths can be washed and dried in the sun. Wooden altar tables should be wiped gently and allowed to air out. After treatment and ventilation, return everything with the same care, and keep the door open for part of each day during the rainy season.

The home office

Paper absorbs humidity quickly, and documents stored in cardboard boxes can develop spots and a musty smell. Move important papers into sealed plastic folders or boxes, and keep them out of the room during ozone treatment. Computers, printers and routers should be switched off and covered or moved, since sensitive electronics are best kept away from ozone.

A child's bedroom

Children spend long hours in their rooms, breathe faster than adults and are often closer to the floor and to soft toys. Wash or sun-dry stuffed animals, change pillows if they smell, and check behind the bed and under the mattress carefully. After treatment, ventilate the child's room a little longer than other rooms before they sleep there again, and watch how they feel over the following nights. If a child's symptoms continue, it is worth talking to a doctor.

A Short Note You Can Send to Neighbours Who Share Your Walls

"Hello, we will be having our house disinfected and ozone-treated after the flood on [date], from about [time] to [time]. The house will be closed during treatment and fully ventilated afterwards. To be extra comfortable, you may want to close the windows on the side next to our house during that period. Thank you for your understanding, and please let us know if you have any questions."

A friendly message like this avoids worry, and often neighbours decide to have their own homes checked at the same time, which helps the whole row recover. In a row of townhomes, one damp house next door can keep feeding moisture into shared walls, so a coordinated effort benefits everyone.

Keeping Moisture from Coming Back

• On dry days, open windows on the top and ground floors at the same time so air flows through the stairwell.
• Keep wardrobes and beds a few centimetres from the wall so air can move behind them.
• Air mattresses and pillows in the sun from time to time, or use a dust mite removal service.
• Wait until ground-floor walls are completely dry before repainting, and choose a breathable paint.
• Wipe stair rails, door handles and light switches with CHEMGENE 750 ml spray.
• Open the shrine room and storage rooms to air out several times a week.
• Before the next rainy season, plan where belongings will go if water rises again, ideally in sealed plastic boxes rather than cardboard.

Frequently Asked Questions

Q: Only the ground floor flooded. Do we really need whole-house ozone treatment?
A: If the upper floors smell musty, show mold spots, or anyone has symptoms, treating the whole house is recommended because the staircase links the air on every floor. If the upper floors are dry and odor-free, focusing on the ground floor may be enough. The team will advise on the survey day.

Q: How long do we need to be out of the house?
A: It depends on the size of the house, the treatment time and the ventilation time. Most homes are completed within a day, and the team will tell you when it is safe to go back in.

Q: What should we do with the shrine room and Buddha images?
A: We recommend respectfully moving Buddha images and delicate offerings out, or covering them appropriately, before treatment, and cleaning them with care afterwards.

Q: Will the neighbours smell the ozone?
A: The team uses a controlled dose and keeps the house closed during treatment. Let neighbours who share your walls know in advance, and ask them to close windows on that side during treatment.

Q: We have already repainted. Can we still do ozone treatment?
A: Yes, and it can also help reduce new-paint odor. In future, make sure walls are fully dry before painting so mold does not grow underneath.

Q: Should we throw away damp mattresses?
A: Mattresses that were submerged in floodwater should be discarded. Upstairs mattresses that are only damp from humid air can often be restored with sun-drying, dust mite removal and ozone treatment.

Make Every Floor of Your Home Safe for Your Family Again

Townhome and townhouse owners in Bang Phli and across Samut Prakan can talk to the WHD team about a floor-by-floor assessment and whole-house disinfection and ozone treatment.

Book Ozone Treatment - Click Here

See Disinfection Service - Click Here

Call 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related Links

• Ozone disinfection for homes
• Ozone odor and chemical residue removal
• Dust mite removal service
• All articles
• External source: WHO: Floods fact sheet and Department of Health, Thailand

#WholeHouseOzone #TownhomeDisinfection #PostFloodDisinfection #MoldRemoval #MustyOdorRemoval #Disinfectant #FloodHomeRecovery #BangPhli

Keywords: three-storey townhome flooded ground floor whole-house ozone, damp upper floors, townhome disinfection, musty odor removal, mold removal, Bang Phli Samut Prakan 2026