Mold is not the problem. It is the evidence.
Mold on a wall, a ceiling or a duct is the visible end of a chain that started with water. In the coastal cities of the UAE that water arrives mostly as vapor: for one hour in four, the air outside carries a dew point above 22 °C. The dew point is the temperature at which the moisture in air turns back into water, and 22 °C is about the temperature we cool our rooms to. So wherever that air reaches a surface at 22 °C or colder, it leaves water on it, and where the water stays long enough, mold follows. Clean the mold and leave the chain intact, and it returns on schedule. Indoor Sciences finds the chain.
- 01Where the water comes fromcondensation, infiltration, leak or humidity load
- 02What is growing, and wherespecies identified by culture, surface by surface
- 03Whether it is oververified by the same methods, after the work
Three coastal mechanisms account for most of the mold we are asked to see.
Elsewhere, mold is usually a leak. Here it is usually the air. Three ways a cooled building on this coast puts humid air against a cold surface, each with its own signature.
The room makes its own cold surfaces.
A room held well below the temperature of the air around it, or of the rooms next to it, turns its own walls, floor and furniture into cold surfaces. Air from a warmer, more humid space touches them and its moisture condenses.
Signature mold low on external walls, behind furniture, on the cold side of a partition; a thermostat set in the low twenties and a humidity reading in the sixties or above.
A cold duct through a humid room.
Supply air leaves the cooling coil at about 12 to 15 °C. A duct with failed, missing or crushed insulation runs at close to that temperature through a room whose dew point may be 18 °C or more; the duct condenses the room's moisture onto itself and drips. This is the storage room in the case record on our home page: 24 °C at 72.1% RH, a dew point of 18.7 °C, a bare supply duct below it.
Signature staining or mold beneath duct runs and around diffusers; moisture on the floor with no plumbing above it.
The building breathes in.
When a building pushes out more air than it lets in, through extract fans, kitchen hoods and leaking ducts, the shortfall is made up from outside: outdoor air is pulled in through every crack and gap in the outer walls and roof, carrying its moisture with it: in summer, a dew point in the mid-twenties. It meets the first cooled surface inside the wall or ceiling. A pressure reading tells us which way air is moving through the walls, not how much; how much depends on how leaky the building is.
Signature mold inside cavities, behind cladding, at the top of external walls and around penetrations; a door that pulls shut on its own.
All three end in the same place: moisture on a surface that is too cold for the air around it. That is why we read air, moisture, pressure and heat as one system, and why a mold investigation that only looks at the mold cannot end the cycle.
Cleaning removes the growth. It does not remove the reason.
Most of what is sold as mold treatment in this market treats what can be seen. The surface is cleaned or painted, sometimes with a biocide, the growth disappears, and the cold surface and the humid air are exactly where they were. In the storage room above, the wall paint was blistering, and the report's first instruction was to find the moisture source before anyone repainted. The interval between treatments is set by the climate, not by the product.
Two things have to be true for mold to stay gone: the surface must no longer sit below the dew point of the air that reaches it, and the material that was colonized must have been dealt with to a defined standard. The first is a building-physics problem: humidity control, insulation, pressure balance, thermostat settings. The second is a remediation problem, executed to ANSI/IICRC S520-2024 and verified afterwards. Neither is solved by a cleaning product, and neither can be confirmed without measurement.
A material that has been wet long enough to grow mold may need to be removed rather than cleaned; that decision is made by inspection, on the type of material and the extent of growth, following S520, not by appearance.
We find the water first. Then we find out what grew.
Every mold investigation runs the same sequence, whether it is a single room under Diagnostics or Phase 01 of an Advisory engagement. The inspection follows the IAC2 Mold Inspection Standards of Practice; the laboratory work is the practice's own.
Interview and history
What was seen, when, after what: rain, a new thermostat setting, a renovation, a change of occupancy, a previous treatment. The history usually points at the mechanism before an instrument does.
Moisture and pressure mapping
Air temperature and humidity room by room, from which the dew point of each space is computed; surface temperatures where a cold surface is suspected; moisture readings inside walls, floors and timber; the pressure of each room against its neighbors and against outdoors; a thermal camera pass over walls, ceilings, ducts and pipes to find the cold spots and the wet patches. Where a surface temperature or a pressure cannot be measured on the visit, the report says so and labels any modelled value as modelled.
Sampling
Air sampling for mold spores, read against the Dubai Municipality guideline of 500 CFU/m³ (TG 119), a count of living mold per cubic meter of air; surface swabs and tape lifts where growth is visible or suspected; and the Moldiness Profile, a surface-by-surface culture of settled dust that maps where growth is concentrated and where it is not. ERMI mold-DNA profiling is added where a whole-dwelling index is useful, alongside culture and never in place of it.
Culture and identification
Samples are cultured in the Saniservice Department of Microbiology, each species identified under the microscope and reported location by location: how much living mold there was, and whether any of the species found are the ones that only grow where a material has been wet. We culture rather than read DNA alone because living mold is what colonizes and spreads and must be removed; DNA counts every spore, living or long dead. Culture has its own limits, and the report states them.
The report
The findings register, ranked by severity; the causal chain from measurement to mechanism; each sampled location with what grew there; the corrective scope, written as a specification a contractor can price and be held to; and the verification plan. Standards cited by document and version. Assumptions labeled as assumptions.
Remediation and verification
Execution is by Saniservice, or by your own contractor if you prefer, to S520, under our supervision where the engagement is Advisory. Then the building is measured again, by the same methods, read in the same laboratory, against the acceptance criteria written before the work began. Where a clearance result must carry formal accreditation, the samples are analyzed by the practice's EIAC-accredited (ISO/IEC 17025) partner laboratory and the report says so.
One room, one report: Diagnostics · The managed program: Advisory
Not "there is mold". Which species, where, how much, and why.
Every location sampled is reported with what was found there: the species identified, how much living mold there was, whether it is one of the species that only grow on material that has been wet, and the temperature and humidity at that location. Read together, the locations form a map: growth concentrated where the mechanism operates, absent where it does not. That map is what makes the corrective scope precise, and it is what the verification is measured against.
The molds we culture most often in UAE homes are Aspergillus, Penicillium and Cladosporium; Stachybotrys appears where a material has stayed wet. The species matters less than where it is growing and why.
Mold does not need a leak. On most building materials it begins once the air touching the surface stays above roughly 75 to 85% humidity for long enough (Johansson, Svensson and Ekstrand-Tobin, 2013, a laboratory result confirmed over two and a half years in real buildings). A room can feel perfectly comfortable at 65% while a cold duct or wall inside it sits above that line. The report records the temperature and humidity at each location so the reader can see which surfaces were at risk and which were not.
The criteria are written before the work. The verification is the same whoever does it.
Indoor Sciences investigates and prescribes. Saniservice, or a contractor of your choosing, executes. The laboratory measures before and after. The acceptance criteria are written into the report before any work is priced, and the clearance is measured against those criteria, by the same methods, whoever carried out the work. That is how a finding stays a finding.
What people ask when they find mold.
Is the mold in my home dangerous?
That depends on the species, the quantity, the location and who is exposed, and it cannot be answered from a photograph. What can be answered is what is growing, how much and why, and that is what the investigation establishes. Where a finding warrants medical advice, the report says so; the practice does not give it.
Can I just clean it with bleach?
You can remove visible growth from a hard surface; you cannot change the reason it grew, and porous materials that have been colonized are not made sound by surface cleaning. Without the moisture cause found and corrected, the growth returns on a schedule set by the climate.
Why culture rather than a DNA test?
Because living mold is what colonizes, spreads and must be removed. A DNA test counts living and dead spores alike and gives one number for the whole home; culture, sampled surface by surface, tells us what is alive and where. We use ERMI alongside culture where a whole-dwelling comparison is useful, never in place of it.
How long does it take?
The site visit takes at least half a day for a three-bedroom home, longer for larger properties; culture needs several days of incubation; the report follows within six working days of the visit. Where ERMI is included, the sample travels to a laboratory in Europe or the United States, and its turnaround sets the minimum; no laboratory in the Gulf performs the test.
Do you do the remediation?
Indoor Sciences investigates, prescribes and verifies. The remediation itself is carried out by Saniservice, or by your own contractor if you prefer, to ANSI/IICRC S520-2024, and the verification uses the same methods and criteria whoever did the work.
What does it cost?
There is no list price, because the fee follows the scope and the size of the property: a single room and a whole villa are different investigations. Tell us what you have seen and where, and the proposal states the fee before any visit is booked.
Start with what can be measured.
Tell us what you have seen, where, and what has already been tried. A building scientist will respond within one business day, propose the right entry point, a single-room diagnostic or a whole-building baseline, and schedule the visit.