Flood cleanup Almaty

Features of cleaning after flooding with technical water

When an apartment is flooded with technical water — from a broken sewer pipe, storm drain, or emergency riser — the consequences are fundamentally different from a clean water flood. In our practice at profi-clean, we see that dirty water carries not just moisture, but bacteria, fats, suspensions, and aggressive chemical compounds. Delay here is critical: if the correct protocol is not initiated within the first few hours, materials absorb contaminants at a molecular level, and restoring them without dismantling becomes impossible.

Why technical water is more dangerous than clean water: biological and chemical threats

Technical water from sewage contains E. coli, staphylococcus, and mold spores — they penetrate the pores of concrete, wood, and drywall within 12-24 hours. Besides bacteria, the composition includes detergents, solvents, and fats that leave an oily film on surfaces. Our profi-clean team on every technical flood site first conducts a rapid pH and organic level test — this determines which set of Kiehl or Sodasan chemicals to deploy. If this step is skipped and you start with regular neutral foam, oils and bacteria remain in the material structure, and within a week a persistent odor appears that does not dissipate.

Drying mistake: why fans without treatment worsen the problem

A typical mistake by Almaty residents after a technical water flood is turning on fan heaters or construction dryers immediately, without prior sanitation. The hot air flow dries the top layer of the coating but seals moisture with bacteria inside the screed or under the laminate. In our orders, the cost of which is calculated individually, we have recorded cases where after such “self-drying,” parquet swelled and mold appeared on the walls within a month — dismantling cost three times more than the cleaning itself. The correct algorithm from profi-clean: first, vacuum removal of standing water with an industrial HEPA-filter vacuum cleaner, then chemical treatment with a bactericidal compound, and only then — drying with dehumidifiers while controlling humidity to 40-45%.

Materials that cannot be saved: how to distinguish reversible damage from irreversible

Drywall, particleboard, and untreated wood lose their structure upon contact with technical water within 6-8 hours — they are dismantled even if they appear dry externally. Ceramic tiles, porcelain stoneware, and monolithic concrete are almost always restorable but require acid washing to remove mineral deposits. Laminate and engineered wood are a gray area: at profi-clean sites in Almaty, we test them with a moisture meter and a trial removal of one board; if the subfloor moisture is above 18%, the covering is completely removed, otherwise mold will develop under the baseboards within six months. In my opinion, the main marker for preserving furniture is the facade material: veneered MDF delaminates irreversibly after technical water, while HPL plastic and stainless steel can be cleaned and disinfected without loss of appearance.

Specifics of Almaty: groundwater, old sewer systems, and pressure fluctuations

In the city of Almaty, technical water floods more often occur in Soviet-era buildings (Central District, Auezov District) due to wear of cast-iron sewer pipes and pressure fluctuations in risers during water shutoffs. Groundwater in the foothill zone — Gorny Gigant, Kamenka microdistricts — when external sewers burst, mixes in sand and clay, clogging drainage channels in the screed. In such cases, at profi-clean we use not standard pumps, but submersible sewage pumps with a cutting mechanism to pump out the viscous mixture. If the house has a basement or ground floor, the risk of technical water flooding is significantly higher — preventive floor waterproofing is needed there, otherwise, after each emergency discharge, water rises through the concrete capillaries.

Hypoallergenic chemicals vs. technical contaminants: what actually works

Ordinary chlorine-based bleaches (“Belizna,” “Domestos”) react with organic matter in contact with technical water and release toxic chlorine gas — this is dangerous for breathing in enclosed spaces. At profi-clean, for sites with technical water flooding, we only use professional bactericidal concentrates from Kiehl, based on active oxygen, and Sodasan with enzymes that break down fats and proteins at the molecular level. To disinfect walls and floors after pumping out water, we apply the solution with a sprayer, allowing a 20-30 minute dwell time, then rinse it off with an extraction machine — this is the only way to remove bacteria from the pores of concrete. Before ordering cleaning after a flood, check with the technician what chemicals are being used: if you hear “bleach will handle it,” it’s a sign that the specialist doesn’t understand the difference between clean and technical water.

How to Prevent Mold Growth After Drying

Drying walls and floors after a flood is only the first step. If surfaces are not treated with antiseptics and air humidity is not controlled, mold spores can germinate within 24–48 hours, even when the water appears to be gone.

Why Mold Appears After Drying — Hidden Moisture in Structures

Drying with heat guns removes water from the surface, but moisture remains in the pores of concrete, in drywall, under baseboards, and in insulation. At profi-clean, we use a hygrometer to measure the residual moisture content of materials: the norm for concrete is up to 5%, for drywall up to 1%. If the reading is higher, Aspergillus and Penicillium spores, which are present in any Almaty apartment, begin to multiply within a day. We have encountered cases where a visually dry wall became covered with black mold within a week — precisely due to moisture in the joint of floor slabs. Before final finishing, be sure to check humidity at three points: near the floor, at a height of one meter, and under the ceiling — moisture lingers longest there.

Antiseptic Treatment — What and How to Treat to Kill Spores

To prevent mold after drying, we use professional fungicides based on quaternary ammonium compounds — they penetrate concrete capillaries to a depth of up to 3 mm and are not washed out during subsequent wet cleaning. Household “Belizna” or vinegar do not work: chlorine evaporates within an hour, and acid does not kill spores in the pores. At profi-clean, we apply the antiseptic with a sprayer using a 0.5 mm nozzle — this ensures even coverage without drips. You need to treat not only the visible flooded areas but also 20–30 cm above the water line — capillary suction draws moisture higher. Pay special attention to corners and areas behind furniture: air circulation there is minimal, and spores germinate there first.

Air Humidity Control — Which Devices and to What Values

After drying and antiseptic treatment, the indoor air humidity should be maintained at 40–50% for two weeks. If outdoor humidity in an Almaty apartment during spring or autumn is 70–80%, without an air dehumidifier, indoor readings will quickly return to 65–70% — this is a risk zone for mold. We recommend placing a household dehumidifier with a capacity of 12–20 liters per day for a room of 20–30 m² and running it for 8–10 hours a day for the first week after drying. A hygrometer is essential: cheap mechanical models often have errors of 10–15%; an electronic one with a remote sensor is better. An air conditioner in dehumidification mode does not replace a dehumidifier — it only reduces humidity by 5–7% and circulates air without removing condensate from the room.

Ventilation and Air Curtains — How to Organize Air Exchange Without Drafts

After antiseptic treatment, the room needs to be ventilated, but not with a draft — a sharp change in temperature and humidity creates condensation on still-damp walls. At profi-clean, we use a combination: a supply air valve on the wall (if available) or micro-ventilation through the top window sash + an air curtain at the entrance door. In apartments on the first floors of Almaty’s “Khrushchevkas” and panel buildings, basement dampness is common — without an air curtain, the dehumidifier will work 30–40% longer. The standard air exchange rate after a flood is 0.5–0.7 room volumes per hour, which is approximately 60–80 m³/h for a 20 m² room. If a musty smell remains in the room after drying, it means air exchange is insufficient, and mold will appear within 3–5 days, even if the walls are visually dry.

Mistakes in Final Finishing — What Not to Do Immediately After Drying

The most common mistake is plastering and painting walls immediately after they dry, without waiting for a two-week moisture quarantine. Water-based paint and gypsum plaster create a vapor-proof film, under which remaining moisture condenses — and mold grows beneath the finish, unnoticed from the outside. We recommend applying a primer with fungicidal additives before painting — it provides an additional barrier for 6–12 months. After a flood, wallpaper should not be hung for at least a month: the glue is an ideal breeding ground for spores. If the finish was already done before the flood and needs to be preserved, treat wallpaper seams and corners with an antiseptic through micro-injections — using a syringe without a needle, 2–3 ml per point every 10 cm, otherwise mold will spread along the seam under the wallpaper.

Comparison of post-flood cleaning by profi-clean and other companies in Almaty

When your apartment is flooded, choosing a cleaning company in Almaty becomes a critical decision — different approaches to drying, disinfection, and treatment yield fundamentally different results after a month. We’ve broken down how professional post-flood cleaning differs from the services of companies that cut corners on stages and chemicals.

Direct cleaning vs. agency model — who is truly responsible for the result

profi-clean performs cleaning with in-house cleaners assigned to the site, without subcontracting. In Almaty, there are about a dozen agencies that sell the order and hand the site over to individual contractor teams — quality control is lost in this scheme. Our practice shows: with subcontracting, cleaners often skip cleaning ventilation ducts and treating areas under baseboards — zones where mold grows within 10-14 days after a fake drying. The difference is visible on a return visit: direct teams offer a 24-hour guarantee, while agencies refer to “the contractor who has already left.”

Hypoallergenic chemicals vs. household bleach — what is safer for residents

profi-clean uses professional products from Kiehl and Sodasan with ECOCERT certifications — they break down into water and oxygen within 48 hours, leaving no toxic residue on children’s toys, aquariums, or open food. Many Almaty companies after a flood drench walls with household bleach or chlorine-based concentrates — chlorine evaporates in 72 hours, but its derivatives (chloramines) settle on textiles and cause allergies in asthmatics. On one job on Abay Avenue, we removed a layer of chlorine residue from a kitchen set that a previous team had left on MDF — the panels had to be sanded again. For families with children under 3, hypoallergenic chemicals are not an option but a necessity.

Equipment with HEPA filtration vs. construction vacuums — the difference in air cleanliness

After wall drying, mold spores measuring 2-5 microns remain in the air — they circulate for up to 6 hours and settle in the lungs. profi-clean uses industrial dehumidifiers and vacuums with HEPA H13 filters, which capture 99.97% of particles down to 0.3 microns. Budget companies in Almaty often work with class L construction vacuums — they only trap large dust from 1 mm, letting spores back into the room. At a site on Satpayev Street, we measured the difference: after HEPA filtration, the level of suspended particles dropped from 180 to 12 µg/m³ in an hour, while a construction unit only reduced it to 95 µg/m³. If allergy sufferers live in the house, demand the filter passport from the team — it’s a direct indicator of air quality after cleaning.

Drying with moisture control vs. “visually dry” — the difference in floor lifespan

profi-clean measures the moisture of concrete screed and laminate with a moisture meter every 4 hours — target levels are 6-8% for concrete and 8-10% for laminate, after which we give the go-ahead for flooring installation. Private teams in Almaty rely on a “visually dry surface” and hand over the site in 2-3 days — with hidden moisture at 18-22%, laminate starts to swell in 2-3 weeks, and parquet boards begin to creak. In one house on Dostyk Avenue, a client called us a month after cleaning by another company — the moisture of the screed under the kitchen set was 28%, and the floor had to be dismantled and redone. Before signing the completion certificate, ask the team to show moisture meter readings at wall and floor joints — if there is no data, there is a high risk of rework in a month.

Disinfection with UV treatment vs. spraying — what kills bacteria in pores

After mechanical cleaning, profi-clean treats walls and floors with closed-type bactericidal UV lamps (safe for people) — ultraviolet light penetrates concrete pores to a depth of up to 2 mm and destroys anaerobic bacteria that chlorine cannot eliminate. In Almaty, disinfection by spraying with a pump sprayer is common — the liquid remains on the surface without penetrating micro-cracks, and within a week, microorganism growth resumes in the tile grout. At the Gagarina site, we recorded: after spraying, the bacterial level on the tile surface dropped by 90%, while after UV treatment, it dropped by 99.97% with a preservation effect of up to 30 days under normal ventilation. If there are open wounds or post-operative household members in the apartment, UV disinfection reduces the risk of infection many times over compared to chemical methods.

What products and equipment we use for disinfection

The choice of chemicals and equipment for disinfection after a flood determines whether mold will return in a month and how safe the room will be for residents. We use only professional compounds and devices certified for dealing with the consequences of flooding.

German hypoallergenic chemicals Kiehl and Sodasan

The basis of our disinfection is concentrates from Kiehl (Antibac series) and Sodasan (professional line), which are active against fungus, bacteria, and viruses but do not contain chlorine or aggressive bleaches. Kiehl Antibac works based on QACs (quaternary ammonium compounds) — it breaks down mold spores at the molecular level, rather than just masking the odor. Sodasan, in turn, uses oxygen bleaching and plant-based surfactants, which is critical for rooms where children or allergy sufferers remain after a flood. In my opinion, the main advantage of these brands is the absence of the harsh “hospital” smell that lingers for weeks after cheap chlorine-containing products. Before applying any compound, we test it on an inconspicuous area of the wall or floor to rule out a reaction with the material — some concentrates can leave stains on drywall or laminate.

Industrial dehumidifiers and Master heat guns

For disinfection, it is not enough to simply wipe surfaces — the air and hidden cavities (under baseboards, behind drywall) are treated with hot fog using generators that we connect for 2–4 hours. Our fleet includes Master DH-737 dehumidifiers (capacity 30 liters per day) and Master B 20 CED heat guns, which heat the room to +40–50 °C, killing mold spores that cannot tolerate dry heat. This combination is rarely used by non-professional crews, and it is precisely this that guarantees mold will not regrow within a week. After heat treatment, ventilation for one hour is mandatory — without this, the concentration of chemicals in the air remains above the permissible exposure limit.

Closed-type ultraviolet bactericidal irradiators

At the final stage of treatment, we place recirculators like “Dezar-3” or “Armad” in the room for 8–12 hours of continuous operation. They circulate air through UV lamps, destroying up to 99.9% of fungal spores and bacteria that may have remained in the ventilation or behind furniture. This is the most underestimated stage in Almaty — many cleaners skip it to save time, and then a month later the client sees black spots at the wall joints.

Karcher steam cleaners with dry steam

For final disinfection of tile joints, plumbing, and hard-to-reach corners, we use Karcher SC 5 steam cleaners, which deliver steam at +140 °C under a pressure of 4.2 bar. The steam penetrates micro-cracks and material pores that a brush cannot reach, mechanically washing out spores without chemicals. When working with plastic panels or stretch ceilings, we reduce the pressure to 2 bar to avoid damaging the material — this is a common mistake by beginners who burn the finish with too hot a stream.

Common mistakes during DIY cleaning after a flood

When Almaty residents try to deal with the consequences of a flood on their own, they often take actions that worsen the damage and make the apartment uninhabitable. Let’s look at the five most critical mistakes we see in our practice.

Using a household dehumidifier instead of an industrial one

Wet walls and floors after a flood cannot be dried by a household fan or oil heater — they circulate air but do not remove moisture from deep within concrete and drywall. An industrial dehumidifier with a capacity of at least 50 liters of water per day and a compressor capable of raising humidity to a “dry fog” state is the only tool that truly extracts water from ceilings. We have often had to visit a week after a self-drying attempt and measure wall humidity at 25–30% against a norm of 6–8% — in such conditions, mold spores germinate within 72 hours. If you do not have a dehumidifier with a HEPA filter and a hygrometer for monitoring, do not start drying — rent equipment or call professionals, otherwise, within a month, the walls will develop black spots, and wooden floors will swell at the joints.

Washing walls immediately after water extraction

Right after the water is pumped out, many people grab a rag and cleaning solution — this is a serious mistake: while moisture has not left the material pores, you are simply spreading dirt and bacteria across the surface rather than removing them. First, allow the walls and floor to dry for 2–3 days with forced ventilation, and only then proceed to wash with a disinfecting compound. In our practice, there was a case in the “Akbulak” microdistrict: the owner started washing drywall partitions on the second day, and within a week the seams separated and mold formed inside — the entire cladding had to be replaced. The correct order is: drying, then mechanical cleaning with a brush, then washing with a disinfectant, and only after that, final drying.

Neglecting disinfection of shoes and clothing

After you walk on a wet floor in house slippers and then step into the hallway, you spread bacteria and spores throughout the entire apartment, even into dry rooms. Self-cleaning often starts without spare shoes or shoe covers, and dirty water with microorganisms remains on soles and is transferred to carpets, sofas, and children’s toys. We recommend placing a container with a disinfecting solution (chlorine-based or based on quaternary ammonium compounds) at the entrance to the flood zone and changing shoes each time you leave the wet area — according to our measurements, this reduces the risk of mold spread by 70%. If this is not done, within 2–3 weeks you will find mold in a wardrobe with clothes, even though water never reached there.

Drying carpets and upholstered furniture in place

Carpet and sofas after a flood cannot be dried indoors — moisture remains in the filling and fibers, creating an ideal environment for bacteria and mites. The most common picture we see is a carpet spread out on a balcony or in the yard, but underneath it is wet tile, and the water does not evaporate from below but rots inside. The correct solution is to take carpets and upholstered furniture to a dry cleaner with industrial drying chambers, where all moisture is extracted within 6–8 hours at a temperature of 40–50°C. In Almaty, there are several drop-off points that handle large items — do not try to dry them at home, as this almost always ends with an unpleasant odor and replacement of upholstery within six months.

Using bleach on colored surfaces

Many Almaty residents habitually pour “Belizna” or other chlorine bleach on walls and floors, hoping to kill mold and bacteria — in reality, they damage colored coatings, and chlorine evaporates within 15 minutes, providing no prolonged effect. On laminate and linoleum, chlorine leaves white spots, on painted walls — streaks, and on tile grout it destroys the structure of the joints. Professional disinfectants based on hydrogen peroxide or quaternary ammonium compounds (e.g., Kiehl or Sodasan) work without aggressive effects on materials and remain active for up to 24 hours. If no special product is available, it is better to use 9% vinegar in a 1:1 ratio with water — it is less aggressive than chlorine and effective against most bacteria, although it does not kill mold spores.