How to Keep Wet Areas Dry, Healthy, and Long-Lasting
In New Zealand’s humid climate — particularly along the Kapiti Coast and throughout Wellington — mould and moisture buildup are common problems in bathrooms, laundries, and kitchens. Left unchecked, they can lead to stained grout, musty odours, tile damage, and even structural issues.
Whether you’re renovating or maintaining existing tiling, understanding how to prevent moisture and mould is key to keeping your wet areas looking great and functioning well.
Why Moisture Builds Up in Wet Areas
Bathrooms, kitchens, and laundries are constantly exposed to water and steam. Without proper ventilation, waterproofing, and surface protection, this moisture gets trapped — creating the perfect environment for mould, mildew, and deterioration.
Common causes include:
- Inadequate or faulty waterproofing behind tiles
- Poor ventilation or airflow
- Leaking taps, fixtures, or grout lines
- Damp surfaces that never fully dry out
The Risks of Ignoring It
Mould isn’t just unsightly — it can trigger allergies, irritate asthma, and break down building materials over time. When water seeps through cracks or behind tiles, it may cause swelling, rot, or hidden leaks that are costly to fix.
Signs you may have a moisture or mould problem include:
- Persistent black or green mould in tile joints
- Crumbling or discoloured grout
- Damp smells, especially in corners or under vanities
- Peeling paint or soft spots in adjacent walls or floors
Practical Tips for Preventing Moisture and Mould
Here are a few ways to keep moisture under control and your tiled areas safe:
1. Ensure Proper Waterproofing
Waterproofing is your first line of defence — especially behind showers, baths, splashbacks, and laundry tubs. Certified membrane systems like Ardex or Bostik should be applied under tiled surfaces to block moisture from entering wall cavities or floors. If you’re renovating, insist on a licensed applicator.
2. Choose the Right Grout & Sealants
Old or low-quality grout is porous and can deteriorate over time. At TileChurch, we use mould-resistant grouts and silicone sealants around joints and corners to stop water infiltration. Regular regrouting may also be necessary in high-use areas.
3. Improve Ventilation
Install a high-capacity extractor fan in bathrooms and make sure kitchen rangehoods are vented outdoors. Open windows after showers or cooking when possible to reduce humidity.
4. Use Surface Sealers
Sealing porous tiles and grout can prevent water absorption and make cleaning easier. Penetrating sealers are especially useful on natural stone or older installations.
5. Maintain Regular Cleaning
A simple weekly wipe-down of tiled walls and floors — especially in showers — helps reduce soap scum and mildew buildup. Use pH-neutral cleaners and avoid harsh scrubbing tools that can damage grout.
Thinking of Renovating? Build It Right the First Time
If you’re planning a new shower, kitchen splashback, or bathroom renovation, getting the waterproofing and ventilation right from the start will save you thousands in future repairs.
At TileChurch, we specialise in moisture-safe tiling systems throughout Wellington, Porirua, Paraparaumu, Waikanae, and beyond. We use premium products, certified waterproofing membranes, and correct installation methods — no shortcuts.
Need Help Fixing or Preventing Mould?
Whether you’re seeing signs of a leak, dealing with stubborn black grout, or planning a full renovation, we’re here to help. Our expert team can inspect your space, regrout affected areas, or completely rebuild with proper waterproofing.
Contact us today to book a quote or ask for advice — and enjoy a fresher, healthier home.