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Mould Growth and Failed Silicone in Bathrooms and Wet Areas

Deteriorated Silicone Trapping Moisture Behind Seals and Promoting Mould Growth.

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Problem

Black mould on external silicone indicates failed waterproofing resistance, usually due to aging and poor ventilation.

Recommended Solution

  1. Step 1: Carefully remove all affected silicone, ensuring no residue remains on the surface to avoid recontamination.
  2. Step 2: Apply a targeted mould treatment to the exposed surfaces to eliminate fungal spores and sanitise the area thoroughly.
  3. Step 3: Once fully treated and dried, reapply a high-quality, mould-resistant silicone sealant to restore the waterproofing and hygiene integrity of the joint.

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Why This Matters

Treating the silicone and removing black mould is essential for both hygiene and long-term protection of your bathroom. Mould not only looks unsightly, but it can also pose health risks, especially in poorly ventilated, damp environments. If left untreated, it can spread behind the silicone and into surrounding surfaces, making it harder and more expensive to remove later. Properly removing affected silicone, treating the area with mould-killing agents, and resealing with fresh, high-quality silicone ensures a clean, safe, and watertight finish. View Full Repair Guide and Tips

Mould growth on silicone in a bathroom

Mould Growth & Silicone Failure – FAQs

How to eliminate bathroom mould and stop moisture from penetrating failed seals.

Mould typically grows on silicone when it loses waterproofing integrity due to age, poor ventilation, or constant moisture exposure. This allows water and organic material to sit behind the seal, promoting fungal growth.

We remove all affected silicone, treat the area with antifungal cleaner, and thoroughly dry the surfaces. Then we apply a mould-resistant silicone sealant to prevent recurrence and restore waterproofing.

Yes. Black mould can release spores that are harmful to respiratory health, especially in damp or poorly ventilated environments. Prompt treatment is essential to protect both surfaces and indoor air quality.

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