A story from the field: the little shop the whole lane was waiting for

Auntie La-iat is sixty-two. She and her husband, Uncle Prayoon, live in a traditional wooden stilt house beside a canal in Bang Pahan district, Phra Nakhon Si Ayutthaya. Upstairs are the bedrooms and a small Buddha room. Downstairs, in the open space between the stilts, is the heart of the family. Auntie runs a small grocery there: shelves of snacks, a drinks cooler, old-style Thai coffee, and a couple of wooden tables and benches where neighbours sit and chat in the evening. Children stop by after school for sweets. In one corner, Uncle Prayoon keeps a bamboo daybed for his afternoon nap.

In 2026 the canal rose and flooded the space under the house to almost one and a half metres. The water stayed for about three weeks. The couple carried some stock upstairs, but the wooden shelving, the bamboo daybed, the benches and a good part of the shop's goods went under. When the water finally receded, the ground floor was covered in mud several centimetres thick. Every timber post carried a sharp tide line. White mold had started to grow around the base of the posts and under the daybed. Flies gathered on piles of debris the water had left behind, and the smell of rotting mud drifted up through the gaps in the floorboards into the bedrooms.

Neighbours began to ask, "Auntie, when are you reopening?" Auntie wanted to reopen quickly; the shop is the household's main income. But her daughter, who works in Ayutthaya town, pointed out something important. A shop that sells food and drinks has to be genuinely clean before it reopens. Otherwise customers could fall ill, and a reputation built over decades could be damaged in a week.

The ground floor: fully flooded, yet where people live the most

Wooden stilt houses were designed to live with water. Floods pass beneath the house without reaching the bedrooms upstairs. In real life, though, the space under many houses in Bang Pahan has become the main living area. It is a shop, a coffee corner, a motorbike repair spot, a place to eat, a place to watch the grandchildren. When the flood comes, these are exactly the spaces that take the full impact.

What the water leaves behind is a mixture of mud from the canal and rice fields, leaves, small dead animals, plastic waste, and water that has passed through the septic tanks and cesspits of neighbouring houses. That mud packs around the base of posts, into the corners of staircases, under daybeds and into joints in the concrete floor. Where sunlight cannot reach and the air stays humid, mold and bacteria grow quickly.

Something many families do not think about is how the smell travels upward. The upper floors of older houses often have gaps between the floorboards. Humid air and odor from below rise into the bedrooms all night long, so older residents sleep badly and cough.

The timber structure needs attention too. Wood that has soaked for weeks holds moisture deep inside. The surface may look dry while the core stays damp for weeks. If a post feels soft, sinks or wobbles, ask a carpenter to check its strength before putting heavy shelving or a cooler back against it. Check every step of the wooden staircase to the upper floor as well, because older residents climb it every day.

Why the space under the house matters so much in Ayutthaya

To understand why recovering the ground floor is urgent, it helps to understand how it is used. In the heat of the central plains, the shaded, breezy space beneath a stilt house is the most comfortable place to be during the day. Families cook there, eat there, receive guests there and run small businesses there. For older couples like Auntie La-iat and Uncle Prayoon, climbing the stairs repeatedly is tiring, so much of their day is spent at ground level.

That means when the ground floor is out of action, the whole rhythm of the household breaks down. Meals are eaten upstairs in a cramped room. Neighbours stop dropping by. Income stops. Older residents spend more time in bedrooms that still smell of mud and become restless and tired. Grandchildren who used to play downstairs after school have nowhere to go.

In a small lane, a shop like Auntie's also plays a social role. It is where people hear news, check on each other and share information about the water level. When it reopens, it is a signal to the whole lane that life is getting back to normal. That is why it is worth doing the recovery properly: the space is not just a room, it is the centre of daily life for a family and its neighbours.

Risks a ground-floor shop must consider before reopening

Health of customers and family

Floodwater can carry E. coli, which is associated with diarrhea, and Leptospira bacteria, which cause leptospirosis, known in Thailand as rat urine fever. The risk is highest for people who walk barefoot or have cuts on their feet or hands and then touch mud. Children who play under the house and older adults who nap on the daybed need extra care. Mold spores on posts and furniture can trigger allergies and coughing.

Food and drink safety

Snacks, dry goods, condiments and drinks that touched floodwater should be thrown away, even when the packaging looks sealed. Floodwater can seep through seams or contaminate the outside of containers, which customers then handle and open. Coolers and fridges that were under water must be checked by a technician, including the electrics and compressor, before they are plugged in again.

Income and reputation

A small neighbourhood shop survives on trust. If customers smell mustiness or see mold on the posts, they may not want to buy anything they will eat. Reopening fast but not truly clean can cost more than waiting a few more days.

Mosquitoes and pests

Water standing in jars, old tyres and plant pots around the house becomes mosquito breeding ground. Rats that fled the water may still be hiding in piles of goods under the house. Clear up and check for droppings and gnaw marks before reopening.

Why hosing down and waiting for the sun is not enough

• High-pressure water alone: It removes the mud you can see, but the spray can drive germs deeper into wood grain and cracks in the concrete.
• Strong bleach poured everywhere: The fumes rise to the bedrooms and sting older residents' noses. Bleach can also discolor and weaken wood, and it still does not reach under the daybed or into post joints.
• Relying on sunshine: The space under a house is shaded by design. Sun only reaches the outer edge, so the middle stays damp for weeks.
• Mosquito coils or incense to cover the smell: A temporary fix at best, and smoke in a semi-enclosed space is bad for anyone with allergies.
• Painting the posts over the stains: If the wood is still damp, the paint will peel and the mold will return beneath it.

The order of work before the shop reopens

1. Protect yourself: Wear boots, rubber gloves and a mask before shovelling mud.
2. Electrical check: Ask an electrician to inspect sockets, cables running under the house and the drinks cooler before anything is switched on.
3. Remove and sort: Throw away food, snacks and drinks that touched the water, plus cushions, mattresses, pillows and cardboard boxes. Keep hard items that can be washed.
4. Remove and wash out mud: Scrape mud from the floor, post bases and under the stairs, then wash with clean water and detergent.
5. Scrub tables and daybeds: A bamboo daybed that is rotting or has deep black mold should be replaced. Hardwood tables can be scrubbed and left to dry.
6. Speed up drying: Open the space to the breeze, use fans, and lift items off the floor.
7. Disinfection fogging: Once the mud is gone, fog the whole ground floor, the posts, the corners and the shelving.
8. Treat the upstairs rooms: Ozone-treat the bedrooms and any rooms the smell has risen into, once they are dry.

The solution: ground-floor disinfection plus upstairs ozone treatment by WHD

Our disinfection fogging service with CHEMGENE HLD4H is the core of the work under the house. Because the ground floor is open, ULV fogging lets the disinfectant settle on posts, post bases, stair corners, under the daybed, on table legs and on shop shelving: all the places hand-wiping never covers evenly.

Our ozone treatment service suits spaces that can be closed: the upstairs bedrooms, the Buddha room, a stock room, or a shop corner with a roller shutter. Ozone reduces airborne mold spores and breaks down musty odors that have risen from below and soaked into the wood. For the open ground floor itself, our team focuses on disinfection fogging, because ozone needs an enclosed space to be effective. We will always tell you honestly which method fits which space.

How the service works

1. Survey: We inspect the ground floor, posts, shop area and upstairs rooms to find mold and odor sources.
2. Mud-removal advice: We point out spots that need more scraping, goods that should be discarded and anything that needs a technician's check.
3. Disinfection fogging: CHEMGENE HLD4H is applied by ULV fogging across the ground floor and shop area.
4. Ozone treatment: Upstairs rooms or the stock room are closed and the generator is set to the room size.
5. Ventilation: Windows and doors are opened until it is safe to go back in.
6. Re-check: We assess odor and moisture again and suggest how to lay out the shop.

Safety during ozone treatment

• No people, pets or plants may be in the room during ozone treatment. Auntie and Uncle should wait outside or at a relative's house while the work is done.
• For the Buddha room, the homeowners themselves should move or cover the Buddha images and offerings beforehand. Our team does not move sacred objects.
• Televisions, delicate electronics, old photographs and rubber items should be removed or covered. The team controls the ozone dose and duration to suit the room.
• After treatment, rooms must be ventilated until the team confirms it is safe to re-enter.
• Close the shop on the day of treatment and put up a notice for customers in advance.

Laying out the shop to cope better next time

Once recovery is done, it is a good moment to make the shop easier to protect. Choose metal or plastic shelving instead of plywood. Put the drinks cooler on a raised platform. Have an electrician route cables and sockets higher off the floor. Keep stock in lidded plastic boxes, and write a list of what must go upstairs when the water rises so that next year's move is quick.

Replace the daybed and benches with versions that are easy to lift and move. Keep the ground floor swept and clear so there are no piles where rats can hide, and turn over containers that could hold water to reduce mosquito breeding. If mosquitoes are bad after the water recedes, our mosquito spraying service can treat the area around the house as well.

Finally, put a small sign at the front of the shop telling customers that the space has been washed, cleaned and disinfected. It helps neighbours feel comfortable sitting down for coffee again.

A simple reopening checklist for ground-floor shops

Many shop owners find it helpful to have a short list on the wall. Before you open the shutters again, check that each of these is done:

• All food, snacks and drinks that touched floodwater have been thrown away and replaced with fresh stock.
• The drinks cooler and any fridges have been checked by a technician, cleaned inside and out, and have run empty for a day to confirm they hold temperature.
• Sockets and cables under the house have been inspected by an electrician.
• Mud has been removed from posts, stair corners and floor joints, and the area has been fogged with disinfectant.
• Counters, tables and shelves have been wiped with a disinfectant spray and allowed to dry.
• Posts and the staircase have been checked for rot or movement.
• Standing water around the house has been emptied to reduce mosquitoes.
• Upstairs bedrooms no longer smell musty; if they do, schedule ozone treatment once they are dry.
• A hand-washing point with soap is available for staff and customers.

None of these steps are complicated on their own. The value is in doing all of them, in order, before the first customer sits down.

Looking after older residents during the recovery

Recovery work is physically demanding, and in many Bang Pahan households the people living in the house are in their sixties and seventies. A few simple precautions make a big difference. Let younger relatives or hired helpers do the heavy mud shovelling, and keep older residents away from the dust and fumes while scrubbing is under way. Make sure everyone drinks enough water and takes breaks out of the sun.

Watch for health warning signs after contact with floodwater: fever, muscle pain especially in the calves, headache, red eyes, diarrhea or a cut that becomes red and swollen. These deserve a prompt visit to a doctor or the local health-promoting hospital, and it helps to mention that the person has been cleaning up after a flood.

Plan the ozone treatment day around the couple's routine. Arrange for them to spend a few hours at a relative's house or a nearby temple fair, rather than waiting on a hot street. When they return, the rooms should be fully ventilated and comfortable, with fresh bedding ready. A restful night's sleep in a room that no longer smells of mud is often the moment families say the recovery finally feels finished.

10 reasons ground-floor shops in Bang Pahan choose WHD

1. We understand central-plains stilt houses and know the ground floor is real living space.
2. ULV disinfection fogging covers posts, corners and shop shelving.
3. We use CHEMGENE HLD4H, a product used in professional disinfection work.
4. Ozone treatment for upstairs bedrooms where the smell from below has risen.
5. We are honest that open spaces suit fogging, while ozone is for rooms that can be closed.
6. We respect Buddha rooms and offerings; homeowners move or cover them themselves.
7. Advice on discarding food and goods that touched floodwater, for customers' safety.
8. CHEMGENE HLD4H spray for wiping counters and tables after reopening.
9. Follow-on mosquito spraying around the house after the water recedes.
10. Children living far away can book on their parents' behalf easily via LINE.

Before and after ground-floor recovery

Customer voice (illustrative scenario)

"I have run this shop under the house since my daughter was small. Every flood, I cleaned it myself. This year the smell went right up to the bedroom and my husband coughed all night, so my daughter booked the team. They told us straight that the ground floor needed fogging and the rooms upstairs needed ozone. Now the shop is open again and the neighbours sit here for coffee like before."

— Auntie La-iat, ground-floor grocery, Bang Pahan (illustrative scenario from field work)

Frequently asked questions

Q: The ground floor is open. Can it be ozone-treated?
A: Ozone needs an enclosed space to work, so open ground floors are treated mainly with disinfection fogging. Upstairs rooms, stock rooms or a shop corner that can be shuttered can be ozone-treated.

Q: Does the ground floor need to be dry before fogging?
A: The mud should be fully removed first. The floor does not have to be bone dry for fogging, but there should be no standing water.

Q: Can I still sell snacks that stayed in sealed packets?
A: We do not recommend it. Food products that touched floodwater should be discarded for customers' safety.

Q: How long do we need to stay out during ozone treatment upstairs?
A: It depends on room size and odor level. The team will tell you the time before starting, and you must wait until ventilation is complete and the team confirms it is safe.

Q: Can the Buddha room be ozone-treated?
A: Yes, once the homeowners have moved or covered the Buddha images and offerings, and with a carefully controlled dose.

Q: Is the disinfectant safe to use around a shop that sells food?
A: Fogging is done while the shop is closed and empty of food stock. Once surfaces have dried and the area has been aired, you can restock. For day-to-day hygiene after reopening, wipe counters and tables regularly and follow the product label instructions.

Q: Our wooden posts still look dark after cleaning. Is that mold?
A: Not always. Floodwater often leaves a permanent stain line in timber. Fuzzy white, green or black growth, a soft surface or a musty smell are signs of mold or rot. Our team can check during the survey, and a carpenter should assess any post that feels soft.

Q: Which areas do you cover?
A: Bang Pahan, Nakhon Luang, Bang Pa-in, Phra Nakhon Si Ayutthaya, Maha Rat and nearby areas. Ask us on LINE @whd268.

Bring the neighbourhood back to the shop under your house

Book a survey of your ground floor and shop in Bang Pahan and nearby areas.

See Disinfection Service — Click Here

Book Ozone Treatment — Click Here

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

Related links

• Residential ozone disinfection
• Mosquito spraying service
• CHEMGENE HLD4H disinfectant spray
• All articles
• External sources: WHO: Floods and health and Thailand Department of Health