Question: The grout between my tiles is cracking, crumbling, or turning grey-black with mould. Can I just paint it?
Answer: Grout paint lasts 6 to 12 months and does not fix cracked or missing grout. Old cement grout is usually past its 5–8 year service life, or the substrate has moved. The proper repair is to grind the old grout out to a clean depth, clean the tile edges, pack premium epoxy or acrylic grout, and seal it. Epoxy grout is worth the extra cost in bathrooms and kitchens because it is waterproof, mould-resistant and typically lasts 15+ years versus 5–8 for cement.
This is a grout-line problem. Hollow or loose tiles are loose hollow tiles. Stains that remain after a deep clean are discolouration rather than a grout problem.
Why Grout Fails in Malaysian Wet Areas
- Cement grout past its 5–8 year service life.
- Substrate movement stressing the joint.
- Damp bathrooms and kitchens feeding mould.
- Cheap unsealed grout used originally.
When to Call
- Grout crumbles to powder when scratched.
- Water is leaking to the floor below — see leaking bathroom.
What a Proper Regrout Involves
- Grind out the old grout to a clean depth.
- Clean the tile edges.
- Apply premium epoxy or acrylic grout.
- Seal cementitious grout with a hydrophobic sealer.
Tiling work carries the 12-Month Tile Adhesion & Grout Warranty.
Costs in KL and Selangor
Published problem range is RM 250 to RM 1,800+ depending on room size. A typical bathroom regrout is RM 650 to RM 1,400 including removal, cleaning, epoxy grout and sealing. KL Servis Rumah publishes tile repair and re-grouting from RM 22 per sq ft.
Use the tile quantity calculator if you are also replacing tiles.
Related Problems
- Loose hollow tiles — the tile has debonded, not just the joint.
- Leaking bathroom — open grout as a water path into the slab.
Frequently Asked Questions
Is epoxy grout worth it?
For bathrooms and kitchens yes — waterproof, mould-resistant, 15+ years versus 5–8 for cement.
Can I just paint old grout?
Paint lasts 6–12 months and does not fix cracked or missing grout.
How much to regrout a standard bathroom?
Typically RM 650 to RM 1,400 including removal, cleaning, epoxy grout and sealing.
Replace the Joint, Don’t Paint Over It
If the grout is powder, the water is already in the joint. KL Servis Rumah provides tiling services across Kuala Lumpur and Selangor.
Send a close-up of a crumbling joint — WhatsApp our tiling team.