A typical scenario (an illustrative story, not an interview with any real person or company)

Muk is the HR manager of a mid-sized company renting the ground and first floors of a shophouse building near Ngam Wong Wan Road. On the night of the heavy rain, the security guard messaged her that water was pooling outside. The next day the company asked everyone to work from home because several Lak Si roads were still under water and small cars could hardly pass.

When staff returned, the first thing everyone noticed was the smell. A damp odour greeted them at the entrance, the carpet tiles in reception had water rings, and a small meeting room closed for days smelled like an unopened wardrobe. Switching on the air conditioning made it worse. Within the first week, an accountant with allergies was sneezing all day, two people took sick leave with diarrhoea, and a visiting client politely asked whether the office had flooded.

The building team opened windows, set up fans and sprayed air freshener every morning, yet the smell returned each time the air conditioning went off in the evening. Muk began looking for a way to deal properly with both germs and odour, and learned that office recovery after a flood has to happen in stages, not just on the surface.

Where Lak Si Flooded: Facts From News Reports

To show what offices in Lak Si faced, here is a summary of news reports from the period. Conditions and figures change daily.

• Ngam Wong Wan and Chaeng Watthana roads: Thai PBS reported BMA water-level readings on 26 September 2026 of 12.5 cm on Ngam Wong Wan Road, where flooding began at 10:25 pm on 25 September, and 10.3 cm on Chaeng Watthana Road.
• Community near Thung Song Hong police station: Thai PBS reported on 26 September 2026 that water stood about 50 cm deep in front of homes near the station.
• Vibhavadi Rangsit Road in front of Thai PBS: Thai PBS reported that on 27 September 2026 this stretch was still flooded so deeply that small cars could not pass, for roughly 2 km, with road improvement works obstructing drainage.

Citywide, Thai PBS reported that the heaviest rainfall on 25 to 26 September 2026 was 210.0 mm in Chatuchak, that some areas received over 300 mm in about 48 hours, and that all 50 Bangkok districts were declared disaster areas on 26 September. Waterlogged points rose from 43 on the evening of 25 September to 135 on 27 September, and the Department of Disaster Prevention and Mitigation (DDPM) reported on 6 October 2026 that around 329,000 Bangkok households had been affected.

For an office, ten-odd centimetres on the road may not sound like much. The consequences, though, are water backing into ground-floor lobbies, car parks, store rooms and toilets; staff wading in and tracking moisture and mud onto carpets; and offices left closed for days in very humid air. Those are exactly the conditions mold and bacteria like best.

What Floods Leave Behind in Lak Si Offices

Offices contain materials and systems that differ from homes, and many of them hide moisture.

• Carpet tiles and broadloom: office carpet has backing and adhesive, dries slowly when wet, and collects mud from shoes every day.
• Ceiling boards and drywall partitions: gypsum absorbs moisture easily; leaks or persistent humidity cause stains and hidden mold on the back.
• Air conditioning: split units, ceiling cassettes and ducted systems have drain pans, cooling coils and filters that are always damp. After a flood, indoor humidity is higher, and musty air gets blown through every room.
• Meeting rooms and closed rooms: rooms left unused for days build up more moisture and odour than open work areas.
• Document stores: paper and files absorb humidity readily and develop musty smells and mold spots, a problem for both health and record keeping.
• Toilets and pantries: flooded streets slow drainage, and some buildings see backflow through floor drains, leaving sewage odours and germs.
• Fabric chairs and reception sofas: upholstery and foam hold smells and moisture for a long time.

So an office that looks clean can still hide sources of germs and odour. Office ozone disinfection in Lak Si should therefore be planned together with carpet cleaning, air conditioning service and leak checks, not as a stand-alone job.

The Germs Floods Bring Into Offices: Bacteria, Viruses, Mold and Odour

Bacteria

Urban floodwater passes through drains and communities, so it often carries sewage bacteria such as E. coli and Salmonella. When staff wade in or drains back up into toilets, these bacteria settle on floors, carpets, door handles and shared equipment, and can cause diarrhoea, stomach pain or vomiting. People who wade for long periods also face a risk of leptospirosis, particularly with cuts on their feet or legs.

Viruses

An office is a place where many people share air and surfaces all day. Respiratory viruses such as influenza and RSV, common in the rainy season, spread easily in sealed air-conditioned rooms. Gut viruses such as norovirus and rotavirus spread via pantry and toilet surfaces. One sick person can become a sick department within days.

Mold

Mold can start growing when materials stay damp for more than 24 to 48 hours. Carpet, ceiling boards, drywall and paper are all ideal food. Airborne spores circulated by the air conditioning trigger allergies, asthma, sinus problems, eye irritation and headaches.

Musty and sewage odours

Post-flood office smells come from compounds released by mold and bacteria and from waste left in drains. They make people uncomfortable, reduce concentration and signal that moisture or a germ source remains.

Higher-risk groups at work: pregnant employees, people with chronic illness or weak immunity, staff with allergies or asthma, older employees, and housekeepers and building technicians who clean flooded areas directly. Anyone with fever, muscle pain (especially in the calves), red eyes, diarrhoea or breathing problems after wading or cleaning should see a doctor promptly and mention flood exposure. Ozone treatment is not a medical treatment.

The Cost to Lak Si Organisations of a Damp Office

Staff health: people spend eight hours or more a day at work. Breathing spores and musty air daily aggravates allergies and respiratory symptoms and can start a chain of illness in a team.

Productivity and sick leave: when several people are off at once, work slips, colleagues carry extra load, and managers lose time to problems outside the core business.

Cost: mold that spreads through carpet, ceilings and ducts forces wider replacement later, often far more expensive than acting early. Important documents that grow mold may have to be recreated.

Image: clients, partners and job candidates notice the smell immediately; a musty meeting room is one of the quickest ways to make a poor first impression.

Morale: many staff have just dealt with flooding at home. Returning to a damp office adds stress, whereas an office restored methodically shows that the organisation takes their safety seriously.

Why the Usual Fixes Fall Short in Flooded Offices

Air freshener sprays and diffusers mask odour for an hour or two but do not destroy mold or bacteria, and some staff may react to the added fragrance.

Running the air conditioning hard all day removes some humidity in office hours, but moisture returns when it is switched off, and if the coil or filter is moldy, the system spreads spores around the room.

Mopping with bleach alone disinfects hard floors but cannot be used on carpet, leaves an irritating chlorine smell in closed rooms and does not reach the air, ceilings or the gaps around desks.

Painting over mold hides the problem; stains reappear within weeks if the wall is still damp.

Fans help ventilation but also blow spores and damp dust onto desks.

Cleaning only what is visible means desks are wiped and carpets vacuumed, but nothing reaches under the carpet, above the ceiling or inside the air conditioning.

None of these steps is wrong. They are the basics, and they need to be followed by a method that reaches the air and surfaces throughout the space, such as ozone, once moisture has been removed at the source.

Office Ozone Disinfection in Lak Si With WHD: Working Around Office Hours

Ozone (O3) is a strongly oxidising gas. Released into a closed space, it spreads through the room and into gaps around desks, under cabinets, above ceilings, into carpet fibres and chair upholstery. It breaks down the structures of viruses, bacteria and mold and reacts with odour molecules, then reverts to oxygen (O2), leaving no chemical residue on desks, keyboards or documents.

According to the test results the company has had certified, which the WHD website states were carried out by Thailand's Department of Medical Sciences and Intertek (UK), ozone treatment eliminates viruses, bacteria and mold by 99.99% under test conditions. Real-world results depend on how clean and dry the space is beforehand.

The general process for offices

1. Survey and zoning: the team assesses floor area, rooms, meeting rooms, document stores and the air conditioning, then divides the office into zones.
2. Out-of-hours scheduling: work is usually done after hours, at weekends or on holidays so the space is free of staff.
3. Preparation: plants, aquariums and food are removed and windows and doors closed. The team advises on any equipment to switch off or move.
4. Ozone release and contact time: a typical cycle is about 30 minutes per zone, with actual time set by the team.
5. Rest and ventilation: after the cycle, the ozone must break down and the space be ventilated as the technician advises before staff or housekeepers return.

WHD provides ozone disinfection for homes, condos, offices, hotels, factories, schools and hospitals. Its office is in Bang Khae district, Bangkok 10160, and it serves Bangkok by appointment via 065-556-6294 or LINE @whd268; same-day visits are not guaranteed. Organisations needing a formal quotation or procurement documents can mention this when they first get in touch.

Safety note: ozone treatment must take place in a closed space empty of people, pets and plants. Staff, housekeepers and security must stay out during treatment and return only after the rest and ventilation period. Ozone does not replace mud removal, replacing soaked materials, fixing leaks or seeing a doctor.

The Office Recovery Order Before Ozone

1. Electrical safety: have the building technician or an electrician check low sockets and ground-floor distribution boards before use.
2. Record the damage: photograph spaces and assets for insurance or the landlord.
3. Remove mud and wash hard floors: clean floors, lower walls, desk legs and toilets, wearing gloves, boots and a mask.
4. Deal with carpet: decide whether flood-soaked carpet can be cleaned or must be replaced; soaked underlay usually goes.
5. Check ceilings and partitions: replace swollen or stained ceiling boards; open damp drywall for inspection if needed.
6. Service the air conditioning: clean coils and drain pans and change filters; in ducted buildings, involve building management.
7. Sort documents: dry or copy important wet papers and discard soaked cardboard boxes.
8. Dry: run dehumidifiers and fans until materials are genuinely dry.
9. Ozone: once clean and dry, treat the space to deal with germs and odours left in the air and corners.

10 Reasons Lak Si Offices Should Consider Ozone After a Flood

1. Covers the whole space: the gas reaches air, desk gaps, under cabinets and carpet fibres that wiping cannot.
2. Tackles several germ groups at once: bacteria, viruses and mold, 99.99% according to the company's certified tests. See the service details
3. Freshens meeting rooms so client-facing spaces are ready again.
4. No chemical residue on desks, keyboards, cups or documents, because ozone reverts to oxygen.
5. Can be done out of hours, so the office need not close on working days.
6. Lowers the risk of illness spreading through the team when combined with good cleaning and hygiene.
7. Helps staff with allergies by reducing airborne spores and damp dust.
8. Short cycle per zone: typically about 30 minutes, plus rest and ventilation.
9. Suits many building types: shophouse offices, high-rise floors, factory offices and agencies. Ask about building jobs
10. Shows care for employees: a methodical recovery gives the team confidence to get back to full speed. Request a quote

Before and After: A Lak Si Office After the Flood

Example Case: A Ground-Floor Office Near Chaeng Watthana

Example case (an illustrative scenario built from common problems, not a review from a real customer)

Ek owns a small design firm of about twenty people in a three-storey shophouse near Chaeng Watthana Road. During the heavy rain, water from the road entered the ground floor, which holds reception and the meeting room. It was not deep, but the whole floor's carpet was soaked, the ground-floor toilet backed up, and a materials store under the stairs smelled strongly musty.

Ek kept staff working from home for three more days. Meanwhile a cleaning crew removed mud, lifted all the ground-floor carpet and washed floors and toilets; an air conditioning technician serviced the units and changed filters; and stained ceiling boards were replaced. Dehumidifiers ran for two days. Once the space was dry, Ek contacted WHD to schedule ozone treatment for all three floors on a Saturday.

On the day, everyone left the building and office plants were moved outside. The team worked zone by zone for the assessed time and allowed rest and ventilation before handing the space back. On Monday staff returned without the old musty smell. Ek's takeaway was not just a better-smelling office but a team confident that the company took their health seriously.

Office Ozone Disinfection Checklist for Lak Si Building and HR Teams

Before treatment

• Ground-floor electrics and low sockets checked
• Mud removed; floors, lower walls and toilets washed
• Soaked carpet and underlay cleaned or replaced
• Swollen or stained ceiling boards replaced
• Air conditioning serviced and filters changed
• All materials genuinely dry, not just on the surface
• Staff, housekeepers, security and building management told when the area is off limits
• Plants, aquariums and food removed

After treatment

• Re-enter only after the rest and ventilation time the technician gives
• Open windows or run fresh-air ventilation early in the working day
• Place entrance mats while the rain continues
• Watch for spots where smell returns, which may signal moisture or a leak
• Encourage handwashing and clean shared touch points such as handles, lift buttons and the coffee machine
• Staff with fever, calf pain, diarrhoea or breathing problems should see a doctor and rest as advised

FAQ: Office Ozone Disinfection in Lak Si

Q: Do we have to close the office for the whole day?
A: Usually not. Most jobs are scheduled after hours or at weekends, but the treated area must be completely empty until the rest and ventilation period ends.

Q: Do computers and documents need to be moved out?
A: Generally furniture and documents can stay. The team advises on any equipment to switch off or handle on site. Food, plants and animals must be removed.

Q: Can ozone replace replacing soaked carpet?
A: No. Carpet and underlay soaked by street floodwater must be cleaned or replaced first. Ozone is the finishing step after cleaning and drying.

Q: How long does it take?
A: A typical cycle is about 30 minutes per zone, plus rest and ventilation. Larger offices are split into several zones, and the team confirms total time after the survey.

Q: Pricing and documents for organisations?
A: It depends on area and number of zones. Request a quote on 065-556-6294 or LINE @whd268. A current promotion offers a free medical-grade disinfectant spray with ozone jobs of 15,000 baht or more.

Q: How soon can the team come?
A: WHD works by appointment and queues can be busy after floods. Get in touch when you start cleaning so you can book a date when the space will be dry.

Plan Office Ozone Disinfection in Lak Si With WHD

Whether your office is on Ngam Wong Wan, Chaeng Watthana or Vibhavadi Rangsit, let your team return to clean air without musty odours and with lower post-flood germ risk.

See WHD Ozone Disinfection Service

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

Related Links and References

• WHD residential and building ozone disinfection
• Disinfection service
• Test certificates
• Contact WHD
• Thai PBS (26 Sep 2026): water levels on Ngam Wong Wan and Chaeng Watthana
• Thai PBS (26 Sep 2026): flooding near Thung Song Hong police station
• Thai PBS (27 Sep 2026): Vibhavadi Rangsit in front of Thai PBS still deeply flooded
• Thai PBS: district rainfall and disaster-area declaration
• Bangkok Biz News: DDPM report of 6 Oct 2026
• CDC: Floods and cleanup safety

Note: figures and flood conditions are as reported on the dates stated and change daily. Stories and example cases are illustrative.