In Sutera Spring, a mother asked whether the mould was causing her daughter's constipation. The report said no, and showed its sources.

SUTERA SPRING, Petaling Jaya. The mother, whom we will call Mdm. Yap, had two questions when she booked a Cleanaholics inspection of her fifteen-year-old semi-detached home for Monday, 24 August 2026. The first was about the mould she could see across the living hall and the bedrooms. The second she asked more carefully: her adult daughter, who works from home in one of the affected rooms, had been suffering from constipation, and she wanted to know whether the mould could be the cause.

The inspection answered the first question with instruments. The second it answered with a literature review, and the answer was not the one that would have sold the job.

What the instruments found

The air, measured room by room, was not the problem. Formaldehyde read a negligible 0.013 milligrams per cubic metre, volatile compounds were low, carbon dioxide was healthy at around 707 parts per million. Two things stood out: fine dust was elevated, PM2.5 around 44 to 60 and PM10 around 60 to 100 micrograms per cubic metre, and relative humidity sat at 55 to 60 per cent, the upper edge of comfort and a level that actively supports mould in this climate.

The building fabric was the problem. Thermal imaging across the home showed cool bands and patches along the ceiling junctions, the wall corners and around the window and door frames, the signature of moisture held in the structure and behind the gypsum boards. Some ceiling zones read three to four degrees cooler than the surfaces beside them.

Under the 365-nanometre ultraviolet lamp, the extent showed itself. Fluorescent deposition across ceilings and walls, along skirtings, and heaviest around the window and door frames, where the timber and gypsum meet and the moisture lingers. The storeroom was the worst-affected space in the house, with streaks of growth running down its walls. Elsewhere the lamp found blooms on painted walls, dense speckling at wall-to-ceiling junctions, and, on one dusty surface, the fluorescent outline of a handprint.

The source, the report concluded, sat behind and within the gypsum-board ceilings and walls, a porous material that in a humid climate and an ageing building becomes a favourable surface for mould once moisture is present. Solid timber elements in the house, by contrast, were not supporting growth. Because mould is airborne and the internal walls are connected, the storeroom was best understood as the tip of the iceberg, not an isolated problem.

Eight days later, the settle plates the inspector had left in the home confirmed it visually. The living-room-and-kitchen plate had grown heavy white to cream cottony mould. The daughter's room plate was heavy, with brown pigment streaking and one glossy colony more consistent with bacteria or yeast. The home office plate, the room where she works all day, was the heaviest and most varied of the three.

The question about the daughter

Here the report did something rarer than finding mould. It told the client, in writing, that the mould was not shown to cause the symptom she was worried about.

We will not tell you that mould caused your daughter's constipation, because the science does not support that, and claiming it would not be fair to you.From the report, 24 August 2026

The inspector had reviewed the two most authoritative assessments of damp buildings and health, from the World Health Organization in 2009 and the United States Institute of Medicine in 2004, alongside the CDC, the EPA and current peer-reviewed research. Neither major review lists constipation, or gut-motility problems of any kind, among the effects linked to indoor mould. Where mould toxins have been shown to affect the gut, it is from eating contaminated food, not breathing indoor spores, and the documented effect is the opposite: nausea, vomiting and diarrhoea. The report flagged the gut question as ongoing research, not a proven effect, and directed the family back to their daughter's doctor.

Then it set out, with the same care, what the evidence does firmly connect to prolonged exposure in a damp, mould-affected home: worsening of asthma, with a 2015 review concluding the link is causal in children; new respiratory symptoms such as cough, wheeze and nose and throat irritation; allergic reactions; and, in susceptible people, rarer immune reactions in the lungs. The people most at risk are infants, older adults and anyone with asthma, allergies or a weakened immune system, who react at lower levels than a healthy adult. And a home office inside an affected room, it noted, is a meaningful exposure because of the hours spent in it.

What was recommended

Because the mould was in the fabric of the building and spread through the air, the recommendation was controlled, contained remediation rather than surface cleaning: seal each work zone under negative air pressure with an air scrubber; remove the contaminated gypsum board under containment and, where board goes back, use a two-way coated anti-mould board; treat the exposed structure at source and capture the airborne load through HEPA filtration; waterproof and moisture-proof where needed and bring the humidity down into a controlled range; then coat, reinstate and verify by settle plate before handover. The home would need to be vacated during the works.

Two paths were set out honestly: a complete programme for the whole house, or a prioritised first phase beginning with the daughter's room, her toilet, the home office and the storeroom, the rooms she uses most and the source of the worst contamination, with the option to extend to the living areas afterwards. The report's own recommendation was plain: if the budget allowed, treat the house as one connected system, which is how the mould behaves; if not, start with the daughter's spaces.

What it means for anyone asking a health question

Parents ask inspectors about health because they cannot ask the mould. The honest answer will sometimes be no, and a company that will say no to the question you asked is the one worth trusting on the question you did not think to ask: whether your daughter should be spending eight hours a day in a room whose ceiling is growing something.

Reported from the Cleanaholics diagnostic of 24 August 2026 and the settle-plate reading of 1 September 2026. The family's name has been changed and the street withheld. Health information is a summary of published evidence, not medical advice; no species is named from field observation.