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Black mould in bathroom in La Palma de Cervelló: causes, cleaning and lasting fix

Riesgo medio · con precaución

Resumen rápido

Bathroom mould is usually condensation, not a leak.

¿Qué está pasando?

Shower steam pushes humidity above 80%.

Causas más probables

  • Poor ventilation after showering

    alta

    Small fan or blocked duct.

  • Failing silicone seals

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    After 3-5 years it loses its biocide.

  • Thermal bridge on outer wall

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    Buildings without insulation have cold corners.

Pasos de diagnóstico

  1. 1

    Clean with diluted bleach

    Spray, wait, scrub.

    ⚠ Parada de seguridad: Never mix bleach with ammonia.
  2. 2

    Replace blackened silicone

    Cut out and apply sanitary silicone.

  3. 3

    Improve post-shower ventilation

    Run the fan 15-20 min after.

Cuándo llamar a un profesional

Call if it returns in 2-3 weeks or exceeds 1 m².

Coste orientativo en La Palma de Cervelló

80280

Silicone replacement and antimould primer.

Contexto local · La Palma de Cervelló

La Palma de Cervelló's climate has high humidity year-round.

  • Comarca: baix-llobregat

Preguntas frecuentes

Is bathroom mould a health risk?

For asthmatics and young children, yes.

Does bleach kill mould completely?

Surface only — if it penetrated it returns.

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Diagnóstico y presupuesto en La Palma de Cervelló normalmente el mismo día.

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