If your bathroom grout is cracking, going dark, or crumbling away between the tiles, you are not doing anything wrong — it happens in almost every bathroom eventually. The good news is that in most cases the tiles are still fine and only the grout needs attention.
What makes grout crack and fall out
A few everyday things wear grout down:
- Movement. Every home shifts slightly with temperature and time. Grout is rigid, so small movements can open up hairline cracks.
- Constant water. Showers stay wet for years. Standard cement grout is porous, so it slowly absorbs water and breaks down.
- Age and original quality. If the grout was mixed too wet or rushed during the original build, it fails much sooner.
- Harsh cleaning. Strong bleach-based cleaners and stiff brushes wear the surface away over time.
Why it is worth fixing early
Grout is not just there to look neat — it is the surface joint that carries the daily water, and the first thing to fail. Once it cracks or drops out, water gets in behind the wall. That can lead to damaged plaster, mould, a musty smell, and tiles that start to sound hollow or come loose. Fixing the grout early is far cheaper than dealing with water damage later.
Signs to look for
- Dark lines or patches that will not clean off
- Gaps or missing sections between tiles
- Grout that feels powdery or rubs away
- Tiles that sound hollow when tapped
What you can do about it
Re-sealing only helps if the grout is still sound. Once it is cracked or missing, the proper fix is to remove the old grout and re-grout the area. For showers and wet areas we recommend epoxy regrouting, which is water-resistant and far more durable than cement.
Not sure whether your bathroom needs a re-seal or a full regrout? Send us a few photos and we will give you a clear, fixed quote.
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