A Six-Month Home Care Calendar After the Flood: What to Do and When, From the First Week to Before Next Year's Rains, With Disinfection, Ozone Treatment and Mold Prevention for Homes in Nonthaburi, Pathum Thani, Samut Prakan and Bangkok's Suburb

Last updated: 16 Oct 2026 | 14 Views |

A Six-Month Home Care Calendar After the Flood: What to Do and When, From the First Week to Before Next Year's Rains, With Disinfection, Ozone Treatment and Mold Prevention for Homes in Nonthaburi, Pathum Thani, Samut Prakan and Bangkok's Suburbs (2026)

A Story From the Field: "We Thought It Was Over" in Bang Bua Thong

Wit is fifty-two and lives in a two-storey townhouse in a housing estate in Bang Bua Thong, Nonthaburi, with his wife and teenage daughter. In previous years, water had sometimes pooled in front of the house, but in 2026 it came inside, almost half a metre deep, and stayed for several days. Once it receded, the whole family shoveled out the mud, washed down the house, and called in a team for disinfection fogging and ozone treatment. Within two weeks, the house felt like home again.

Wit thought the job was done and went back to his normal routine. Three months later, his wife opened the cupboard under the stairs and found a leather handbag completely covered in mold. The living room wall, which they had repainted too soon, began to bubble in patches. When they switched on the bedroom air-conditioner, a musty smell blew out. Their daughter started sneezing in the mornings again.

What Wit lacked was not effort. It was a long-term plan. A flood leaves moisture in the structure of a house for far longer than you can see. Many homes in Nonthaburi, Pathum Thani, Samut Prakan, Nakhon Pathom and Samut Sakhon have had similar experiences since the water went down in 2026. This article sets out a practical six-month calendar so you know what to do in each period and what to look out for.

Why Care Needs to Continue for Six Months

Walls dry more slowly than you think: Masonry and brick walls that sat in water for days can take weeks or even months to dry all the way through. Paint or wallpaper applied too early traps that moisture inside.
Mold comes back in waves: Spores left in hidden corners start growing again whenever humidity rises, for example during a rainy spell or when a room is closed up for a long time.
Musty smells hide: Cupboards, drawers, air-conditioners and the space under the stairs collect odors that often only become noticeable weeks later.
The health of the household: Lingering damp and mold can trigger allergies, asthma and breathing problems, particularly in children and older adults. Anyone with unusual symptoms should see a doctor; this article is not medical advice.
Next rainy season arrives sooner than expected: Six months after the water recedes is exactly when you should be preparing the house for the next round of rain.

Think of the six months in two halves. The first three months are about recovery: getting the house dry, clean and safe. The second three months are about resilience: using the dry season to make sure the next flood, if it comes, does less damage.

Period 1: The First Week After the Water Recedes (Mid to Late October 2026)

Goal: Safety first, then get the water, mud and damaged items out as quickly as possible.

☐ Have an electrician check the electrical system before switching it on if sockets or the distribution board were under water.
☐ Photograph the damage in every room for insurance claims or assistance applications.
☐ Shovel out mud and wash floors and lower walls. Wear rubber gloves, boots and a mask, and cover any cuts on your hands.
☐ Throw away food, mattresses and upholstered furniture that soaked in floodwater for a long time.
☐ Open doors and windows for ventilation on every dry day.
☐ Use bottled water for drinking and cooking until you are confident about water quality.

In this first week, resist the urge to make the house look nice. Cosmetic work can wait. What matters is removing contamination and starting the drying process as early as possible.

Period 2: Weeks Two to Four (Late October to Mid November)

Goal: Dry the house, disinfect it and deal with musty odors throughout.

☐ Strip out materials that have absorbed water and rotted, such as sagging gypsum ceilings, swollen plywood walls and buckled laminate floors.
☐ Book a disinfection service using CHEMGENE HLD4H once mud and damaged items have been cleared.
☐ Follow up with an ozone treatment service to tackle airborne mold spores and musty odors.
☐ Wash all curtains, bedding and clothes, and dry them completely in the sun.
☐ Do not repaint yet. Wait until the walls are genuinely dry.
☐ Make a list of spots that are still damp or smell, to use as your re-check list later.

This is the most important period in the calendar. Disinfection and ozone treatment work best once the bulk of the mud and soaked materials have been removed, and before mold has had time to establish itself deep in walls and furniture.

Period 3: Month Two (Mid November to Mid December)

Goal: Repair at the right time and check for odors regularly.

☐ Check the moisture in walls before painting. If a wall still feels cold and damp to the touch, or old paint is still blistering, keep waiting.
☐ Clean every air-conditioner that was in the house during the flood. The coils and drip trays are prime spots for mold and odors.
☐ Do the morning smell test every week: close a room overnight and walk in first thing in the morning.
☐ After painting or repairs, consider ozone treatment for paint odors and chemical residue before moving back into bedrooms.
☐ Keep a CHEMGENE HLD4H 750ml spray handy for frequently touched surfaces and any spots where stains begin to appear.

Month two is when patience pays off. It is tempting to finish every repair quickly so the house feels normal again, but rushing paint, wallpaper or new built-in furniture onto walls that are still damp is the most common reason problems return later in the calendar.

Period 4: Month Three (Mid December 2026 to Mid January 2027)

Goal: Check the hidden places that are so easy to forget.

☐ Open the cupboard under the stairs, every wardrobe and all the bottom drawers. Check bags, shoes and documents.
☐ Pull wardrobes and beds away from the walls to check behind them.
☐ Check mattresses and sofas that did not soak in water but have been sitting in a damp house for a long time. Use our dust mite removal service if they start to smell or family members are sneezing often.
☐ If mold reappears in several places, ask the team for a re-check and consider a targeted second round of ozone treatment.

This is the point at which Wit's family discovered their problems. It is also the point at which most households have stopped paying attention. A single afternoon spent checking cupboards and behind furniture can prevent months of trouble.

Period 5: Months Four and Five (Mid January to Mid March 2027)

Goal: Use the dry season for bigger improvements so the house copes better with the next flood.

☐ Consider raising ground-floor sockets and switches higher up the wall, after consulting an electrician.
☐ Replace ground-floor materials with ones that tolerate water and are easy to clean, such as tiles instead of laminate, or cabinets on raised legs.
☐ Improve drainage around the house and clear the drain in front of it.
☐ Paint walls that are now thoroughly dry, choosing paint labeled as moisture-resistant or anti-mold.

The dry months are the best time of year for building work. Materials dry properly, paint cures well, and contractors can work without interruptions from rain.

Period 6: Month Six (Mid March to April 2027)

Goal: A final check, and preparation for the next rainy season.

☐ Inspect every room against the list of damp spots you have kept since the first month.
☐ Plan how you will move important items to higher ground when flood warnings are issued, including documents, medicines and electrical appliances.
☐ Clean gutters and drains before the first rains.
☐ Keep the phone numbers of your electrician, plumber and service teams somewhere easy to find.

By the end of month six, the goal is simple: a house that has been dry and odor-free for several months, a short list of known weak points, and a plan for what the family will do if water rises again. Take a moment to look back at the photos from the first week. Seeing how far the house has come is a good reminder that the steady, month-by-month effort was worth it, and it will help you stay calm and organized if you ever need to go through this again.

Adjusting the Calendar for Different Types of Homes

Homes around Bangkok vary a great deal, and the same flood affects each type differently. Use the calendar as a framework and adjust the emphasis to suit your property:

Townhouses in housing estates: Shared walls mean moisture and odors can travel from a neighbor's unit as well as your own. If the house next door is still drying out, keep checking the party wall well into month three, and talk to neighbors about coordinating disinfection on the same week if possible.
Single-storey detached houses: Every room was probably affected, so there is no "clean upstairs" to retreat to. Prioritize bedrooms in Period 2 so the family can sleep comfortably while other rooms are still being repaired.
Raised Thai-style houses and wooden homes: Pay special attention to the space beneath the house, where mud and stagnant water can linger long after the living areas are dry. Wooden floors and walls may need longer to dry than masonry.
Ground-floor condominium units: Check with the building's juristic person about common areas such as car parks, corridors and trash rooms, since odors from these spaces can drift into units. Keep your own unit's calendar, but align re-checks with the building's maintenance schedule.
Shophouses with a business downstairs: The ground floor usually needs to reopen quickly. Follow the calendar for the shop area in compressed form, and leave the upstairs living space to dry fully before repainting.

Keeping a Simple Recovery Log

A notebook or a shared note on your phone can make the whole six months far easier. It does not need to be detailed. A few lines after each task are enough:

Date and task: For example, "Cleaned bedroom air-conditioner" or "Disinfection and ozone treatment, whole house".
What you noticed: "Slight smell behind the wardrobe" or "Wall by the back door still cool to the touch".
Next action: "Check again in two weeks" or "Ask the team to look at this on the re-check visit".

Over time, the log shows patterns. You may notice that one corner always smells after heavy rain, or that a particular cupboard keeps developing mold. Those patterns point to the real source of the problem, which is often a leak, a blocked drain or a gap where water seeps in. Fixing the source during the dry months is the single most effective step you can take to stop the cycle. The log is also useful if you need to show a landlord, an insurer or a contractor what has happened and what has already been done.

The Six-Month Calendar at a Glance (No Prices)

Period	Main tasks	What to watch for
Week 1	Electrical check, mud removal, discard damaged items	Cuts, standing water, drain smells
Weeks 2–4	Strip rotted materials, disinfection fogging, ozone treatment	Remaining damp spots and odors
Month 2	Clean air-conditioners, repairs, paint only when dry	Blistering paint, morning smells
Month 3	Check cupboards, behind furniture, mattresses	Returning mold, family sneezing
Months 4–5	Major improvements during the dry season	Drainage, socket height
Month 6	Final check, prepare for the rains	Gutters, plan for moving belongings

Making the Calendar Work in Real Life

The best calendar is the one your household actually sees every day. Many families have found these simple habits effective:

Print it and stick it on the fridge: Tick off each task as it is finished, so everyone can see progress together.
Set a phone reminder at the start of each month: Treat it as your monthly house-check day. Walking through the risk points on the list takes only half an hour.
Divide responsibilities clearly: For example, one person looks after air-conditioners and electrics, another handles cupboards, clothes and bedding. A teenager can take charge of the morning smell test.
Photograph the same spots every month: Take pictures of lower walls and behind cupboards from the same angle each time. You will see at a glance whether stains or mold spots are growing.

Signs you should ask for a re-check before the next scheduled point

A musty smell returns within a few days after airing the house.
Mold appears in rooms the water never reached.
Family members sneeze, cough or get itchy eyes more in one particular room.
Freshly applied paint or wallpaper blisters or shows stains.

Habits That Bring the Problems Back

Painting too soon: Paint seals moisture into the wall, and mold grows underneath within weeks.
Relying only on bleach: It helps on surfaces but does not deal with spores in the air or inside porous materials.
Covering smells with air freshener: The problem is still there, just hidden for a while.
Forgetting the air-conditioners and cupboards: In many homes, these two are the source of musty smells months after the water has gone.

Where Disinfection Fogging and Ozone Treatment Fit In

The World Health Disinfection (WHD) team helps at the most important points in this calendar: Period 2, and any re-check that follows. A typical service runs like this:

Survey: We inspect every room and record damp spots, mold and odors.
Clearing advice: We explain which materials should be stripped out and which items discarded before work begins.
Preparing the space: People, pets and plants leave the house. Food is put away. Sensitive electronics and artworks are covered or moved.
Disinfection fogging with Chemgene HLD4H: Using ULV equipment that reaches corners throughout the house.
Closed-space ozone treatment: Using a controlled ozone dose matched to the size of the home.
Ventilation: The house is opened up until the ozone has broken down before anyone moves back in.
Re-check: A follow-up visit in month two or three if odors or mold return.

Ozone safety: No people, pets or plants may be in the house during ozone treatment. Sensitive electronics, artworks and rubber items should be covered or moved out, and the house must be ventilated thoroughly according to the team's instructions before anyone returns.

10 Reasons Homes Around Bangkok Plan Their Recovery With Professionals

ULV disinfection fogging covers the whole house at the most critical moment.
Ozone treatment tackles musty odors and airborne mold spores.
CHEMGENE HLD4H is a disinfectant used in medical settings and public spaces.
You get a list of your home's risk points to re-check throughout the six months.
You learn the right timing for painting and repairs.
It combines with ozone treatment for paint odors and chemical residue after repairs.
It works alongside residential ozone disinfection sized to your home.
Clear safety procedures protect families with children and older adults.
It reduces the chance of mold returning in months two and three.
The team serves Nonthaburi, Pathum Thani, Samut Prakan, Nakhon Pathom, Samut Sakhon and Bangkok.

Before and After Having a Home Care Calendar

Before

Believing the job was done by week two
Repainting too early, so the walls blistered
A moldy handbag in the cupboard under the stairs
A musty air-conditioner
Their daughter sneezing in the mornings again

After

Knowing exactly what to do each month
Painting only when walls are truly dry
Cupboards and the backs of furniture checked on schedule
Air-conditioners cleaned on time
A house ready for next year's rainy season

In the Words of a Homeowner

"At first I thought that once the fogging and ozone treatment were done, we were finished. That work really did help, but then I painted too soon and completely forgot about the cupboards and the air-conditioners. Now we have the calendar stuck next to the fridge, and every month we know what to check. When mold showed up in the cupboard, we had the team come back for a re-check. The house feels comfortable again, and I have a plan for next rainy season too."

— Wit (pseudonym), townhouse owner in Bang Bua Thong, Nonthaburi

Note: The story and quote in this article are an illustrative scenario based on situations commonly encountered after floods. Actual results depend on the condition of each home and the extent of damage.

Frequently Asked Questions

Q: When in the calendar should we book disinfection and ozone treatment?
A: Usually in weeks two to four, after mud and damaged items have been removed. A re-check in month two or three may be worthwhile if odors or mold return.

Q: How long should we wait before painting?
A: There is no fixed number. It depends on wall thickness and the weather. Wait until the wall no longer feels cold and damp, and ask a painter or contractor who uses a moisture meter.

Q: Do we need ozone treatment every month?
A: No. Most homes need one main round, followed by a re-check only when there are signs such as returning odors or mold.

Q: Our water level was low. Do we need to follow the whole calendar?
A: You can adapt it to the level of damage, but smell tests, cupboard checks and cleaning the air-conditioners are useful for any home in a flooded area.

Q: What if we rent our home?
A: Talk to your landlord about repairs and disinfection, and use this calendar as a shared checklist.

Q: Does running a dehumidifier help?
A: It is very good at reducing humidity in closed rooms, especially in the first few months, but it does not disinfect or break down odors that are already embedded. Use it alongside disinfection and ozone treatment.

Start Your Home Care Calendar With the Most Important Step

Serving Nonthaburi, Pathum Thani, Samut Prakan, Nakhon Pathom, Samut Sakhon and Bangkok.

View Disinfection Service – Click Here

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