mould in the house

Mould at home: prevention without magic

How indoor mould gets going, what to do in practice, and when to stop. A building guide, not a medical one.

Updated 2026-09-01 · 10 min read

Indoor mould is an organism that finds water, time and a surface. Remove standing dampness and growth stops. Leave the water and every anti-mould product is cosmetic.

Where it usually starts

  • North corners and window reveals (thermal bridges).
  • Behind wardrobes on external walls (stagnant surface air).
  • Windowless bathrooms and shower ceilings.
  • Rooms used as drying rooms.
Compare your climate with the ISO 13788 threshold

Order: climate, then cleaning

  1. Name the family (see diagnosis).
  2. Lower RH or raise the surface temperature.
  3. Clean the visible stain with protection, and ventilate.
  4. Let it dry. Paint only after.

What we will not do

  • We do not recommend encapsulating active mould with a covering coat.
  • We do not sell the idea that an essential oil disinfects a wall.
  • We do not treat mould from an active leak as a dehumidifier problem.

If the stain returns in the same place within weeks, the cause is still there. Returning to diagnosis is cheaper than a third tin.

FAQ

Is bleach enough?+

It can lighten a surface stain. It does not change the climate that produced it. On porous materials the roots remain. Protect skin and airways; do not mix products.

Will anti-mould paint fix it?+

If surface RH stays high, it is a delay. It belongs as a finish after cause and climate are corrected, not as the only move.

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What may help (after diagnosis)

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8–18 €

Spray/foam for visible mould (e.g. HG 500 ml)

Example product to remove mould already visible on silicone, grout and tiles. It cleans the surface; it does not dry the air or close a thermal bridge. Covering paint alone, if moisture stays high, is a delay.

When: After you understand the cause, while RH is being lowered or vapour extracted. Small surfaces, household use.

Not when: Large areas, strong odour, vulnerable occupants — consider a professional. Not medical guidance and not a structural treatment.

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Read the label and safety data sheet before use.

10–25 €

TempPro / ThermoPro TP50

Example desktop hygrometer for diagnosis. Without a relative-humidity number every tip is guesswork. Not a lab review.

When: Always, as the first diagnostic step.

Not when: It does not replace a moisture meter or a rising-damp survey.

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180–320 €

COMFEE’ 16L Wi‑Fi

Example compressor dehumidifier. Useful if indoor air sits above ~60–65% and the cause is indoor vapour. Not a lab review.

When: Measured high RH, window condensation, indoor drying, windowless bath.

Not when: Rising damp, leaks, stains that start at the skirting and climb.

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12–35 €

Ariasana Aero 360° Kit

Salt moisture absorber, no electricity. Not a compressor dehumidifier: useful in wardrobes and small bathrooms, not enough if the whole home is damp.

When: Wardrobe, hall, small bathroom — after you know it is not a wet wall.

Not when: Not a substitute for an extractor or dehumidifier if whole-home RH stays high.

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8–16 €

Reflexx R99 nitrile gloves

Example PPE for small-area cleaning of visible mould. Useful for a local job; they do not replace ventilation or a professional on large outbreaks.

When: Household cleaning of silicone, grout or a small patch, after diagnosis.

Not when: Large areas, strong odour, vulnerable occupants: consider a professional. Not a medical device.

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Useful for localised cleaning; they do not replace ventilation or a professional on large jobs.

8–18 €

SafEye EN166 safety glasses

Example safety glasses for localised cleaning. They do not “remove” mould and do not replace a professional on a large area.

When: Using spray/foam on small surfaces, after reading the label and safety data sheet.

Not when: Not site-wide certified PPE for every job; it does not treat the cause.

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Amazon.it affiliate link (tag qordac21-21): we may earn a commission, at no extra cost to you. A category example, not a lab review. Amazon.com is not used.

Useful for localised cleaning; they do not replace ventilation or a professional on large jobs.

10–25 €

SICURA FFP2, 20 pcs

Example FFP2 masks for localised cleaning. They do not purify the home and do not replace airing or professional work.

When: A short clean of visible mould in a ventilated room.

Not when: Not a medical protocol. Large areas or frail occupants: raise the level.

View on Amazon.it

Amazon.it affiliate link (tag qordac21-21): we may earn a commission, at no extra cost to you. A category example, not a lab review. Amazon.com is not used.

Useful for localised cleaning; they do not replace ventilation or a professional on large jobs.

Sources

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