Signs Your Shower Needs Regrouting or Resealing

Written by Nestor Dos Santos, Owner, TN Stone Pty Ltd · Updated 14 July 2026

A shower may need regrouting or resealing when grout is cracked, crumbling, stained beyond cleaning, or when silicone joints have started to peel, gap or fail. Recurring mould, musty smells, water staining and joints that keep deteriorating are common signs that cleaning alone may not solve the problem.

In many cases, the issue is limited to the grout lines or flexible joints, but sometimes these signs can point to a larger waterproofing or tile-related problem. The goal is to work out whether the shower needs routine maintenance, targeted repair, or a more substantial fix.

Common signs your shower may need regrouting or resealing

Shower grout and silicone rarely fail overnight. The signs tend to build up gradually, and several appearing together is a stronger indicator than any one on its own:

• Grout that is cracked, crumbling, missing or repeatedly discolouring, even after cleaning.
• Mould that returns soon after cleaning, despite a decent scrub and a mould-specific product.
• Silicone that is peeling, shrinking, splitting or separating at corners and edges.
• Musty smells, damp-looking areas or water marks outside the shower zone itself.
• Repeated grout failure in corners, where a movement joint should have been sealed with silicone rather than grouted.

What cracked or failing grout looks like

Grout failure tends to show up in a fairly predictable way. Look for:

• Cracking along the grout line, whether fine hairline cracks or larger, more obvious splits.
• Crumbling or powdery grout that comes away when you run a finger or fingernail along the joint.
• Missing sections where grout has washed out or worn away, leaving a visible gap between tiles.
• Pinholes — small holes in the grout surface that can let water track behind the tiles.
• Persistent staining or discolouration that cleaning products no longer lift.

Grout that keeps cracking or failing in the same spot, even after being repaired, is worth taking seriously rather than patching repeatedly. For a closer look at what causes this kind of damage in the first place, see our related guide, What Causes Grout Cracking?

What failed silicone or sealant looks like

Silicone is used at movement joints — where the wall meets the floor, at internal corners, and around the shower base or hob — rather than between tiles on a flat plane. Failed silicone usually shows up as:

• Gaps or lifting, where the silicone bead has pulled away from the tile or base on one or both sides.
• Black mould underneath or within the silicone itself, rather than just sitting on the surface.
• Cracking or splitting along the length of the bead.
• A sticky, degraded texture instead of the smooth, slightly rubbery finish of healthy silicone.
• Discolouration that no longer responds to cleaning, particularly yellowing in bathrooms with limited ventilation.

Corners and other movement joints are a common trouble spot, since they need flexible silicone rather than rigid grout to handle slight movement without cracking. If you're not sure whether a joint should be silicone or grout in the first place, our guide on When to Use Caulking vs Grout explains where each one belongs. If the silicone itself has failed, How to Remove Old Silicone from Showers and Splashbacks covers how it's properly removed and replaced.

Can cleaning fix it, or is repair more likely needed?

This is the question that matters most, because it's the difference between a Saturday morning job and a call to a tiler.

• Cleaning may help when the problem is surface dirt, soap scum or light mould sitting on otherwise sound grout and silicone.
• Regrouting or resealing is more likely needed when the joints are physically failing — cracked, crumbling, gapping or peeling — or when the same problem keeps returning shortly after cleaning.

For general upkeep and mould removal on grout that's still in good condition, see How to Clean Grout and Remove Mould. If cleaning isn't holding the problem back for long, that's usually the sign the joints themselves need attention rather than another round of scrubbing.

What regrouting and resealing can fix

Regrouting and resealing are surface-level repairs, and for most showers, that's exactly what's needed. Done properly, they can fix:

• Cracked, crumbling, pitted or discoloured grout that's otherwise sitting on sound tiles.
• Mould that has taken hold in the grout or silicone itself, once the affected material is fully removed rather than cleaned over.
• Gaps, lifting or failed silicone at movement joints, corners and the shower base.
• Minor water ingress through the grout or silicone surface, before it has reached the substrate.

Product choice matters too — see Best Grout for Showers in Australia for how epoxy, cement and urethane grouts compare for wet areas. TN Stone specialises in epoxy grout upgrades and shower regrouting across Melbourne — see our Epoxy Grouting & Shower Regrouting service page for details.

What these repairs cannot fix

Regrouting and resealing only address the surface. They won't resolve:

• A failed waterproofing membrane behind the tiles — fresh grout or silicone on the surface won't stop water that's already found its way into the wall or floor structure.
• Loose or hollow-sounding tiles, which usually mean the adhesive bond has failed.
• Water damage that's already reached the substrate, such as a soft floor, damage to an adjoining room, or staining on a ceiling below the bathroom.
• Grout that keeps failing in the same spot shortly after being repaired — this often points to movement or a waterproofing issue, not a grouting problem.

If any of these apply, or you're simply unsure whether a repair will be enough, the shower may need more than a surface fix. Our guide on When to Regrout vs Retile a Bathroom walks through how to tell the difference, and what a full retile involves if that turns out to be the better option.

When to call a professional

DIY regrouting and resealing can work well for small, contained jobs where the tiles are otherwise sound. It's worth calling a professional if:

• Mould or staining keeps returning shortly after cleaning or a DIY reseal.
• You notice water staining, musty smells, or damage outside the shower recess itself.
• Tiles feel loose, sound hollow when tapped, or the floor feels soft or uneven.
• Grout has failed in the same spot more than once despite being repaired.
• You want epoxy grout installed correctly, since it's less forgiving than cement-based grout to apply and fix.

If a shower is showing signs of cracked grout, failed silicone or recurring moisture problems, TN Stone can inspect the joints and recommend whether regrouting, resealing or further repair is the more practical next step. We provide shower regrouting, resealing and waterproofing-related services across Melbourne and the western suburbs, including Brookfield, Werribee, Caroline Springs, Footscray and surrounding areas.

Frequently asked questions

How do I know if shower grout needs replacing or just cleaning?

If the grout is still solid and the problem is surface dirt, soap scum or light mould, cleaning is usually enough. If the grout is cracked, crumbling, missing in patches, or mould keeps returning soon after cleaning, it likely needs replacing rather than just cleaning.

Can regrouting stop a leaking shower?

Regrouting can stop water getting in through failed grout lines, but it won't fix a leak that's coming from a failed waterproofing membrane behind the tiles. If water has already reached the substrate, regrouting alone won't solve the underlying problem.

How often should shower silicone be replaced?

There's no fixed schedule, but many showers need resealing every 3–5 years, sometimes sooner in high-use bathrooms. Silicone that's peeling, shrinking, splitting or separating at corners and edges is due for replacement regardless of age.

Can a shower be resealed without removing tiles?

Yes, in most cases. Resealing silicone and regrouting grout lines are both surface-level repairs that work around the existing tiles. Tiles only need to come up if there's damage to the substrate or waterproofing membrane underneath.

What happens if cracked grout is left too long?

Cracked grout lets water reach the adhesive bed and waterproofing membrane underneath. Left long enough, this can lead to loose tiles, a failed membrane, or damage to the substrate, turning a simple regrout into a much larger and more expensive repair.

Is regrouting enough if the tiles are still in good condition?

Usually, yes. If the tiles are firmly fixed with no hollow sounds or movement, and the problem is limited to the grout itself, regrouting is typically enough. Problems beyond the grout, such as water staining or loose tiles, point to a bigger repair.