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When water starts appearing where it shouldn’t, silicone can seem like the obvious answer. A shower is leaking, the seal around the edges looks cracked, or mould keeps returning to the same corners, so replacing the silicone feels like a quick way to make the problem disappear.
Sometimes, it is part of the solution. But silicone is only one component of a tiled wet area, and it cannot compensate for damaged grout, failed movement joints or problems with the waterproofing system underneath the tiles.
This is particularly important in Melbourne homes, where bathrooms, balconies and other tiled areas are exposed to constant moisture, temperature changes and everyday movement. Applying a fresh bead of silicone over an underlying problem may improve the appearance temporarily, but it does not necessarily address where the water is actually getting through.
The key is understanding the difference between sealing a surface and repairing the waterproofing system behind it.
Silicone sealant creates flexible, water-resistant joints between surfaces that may move relative to one another. Specifically in showers, you’ll often find these points at changes in direction, such as the intersection of a wall and the floor, or where two tiled walls form a corner. Silicone sealant is more flexible than grout, so it can stretch and flex slightly without cracking.
It also makes it an important part of a properly constructed shower or tiled surface. Silicone sealant is not a substitute for the waterproofing membrane that gets installed behind tiles. That membrane is part of your overall waterproofing system. It prevents water from getting through into the substrate and other building materials.
Silicone is applied directly to the surface and protects specific joints from water penetration. This is an important distinction if you have a leak that won’t go away. Provided the rest of your shower is sound and only the silicone has failed, you may be able to simply replace the silicone.
If water is leaking through cracked grout or through some other hole in the tiles, regrouting your shower may be the better repair. If your waterproofing membrane has failed, then applying new silicone won’t help.
A new silicone seal can look excellent when it is first installed. The problem is that appearance does not tell you whether water is still getting into the structure.
There are several reasons why silicone alone may not provide a lasting solution.
Silicone doesn’t seal all the tiled surface area. Water could be entering through cracked grout elsewhere in the shower stall. By sealing up that one perimeter joint, it doesn’t stop water from getting behind tiles elsewhere.
If your balcony grout has cracked along many joints, re-siliconing the edges won’t fix the problem joints that water is entering through. That’s why figuring out where your leak is coming from is important before determining what needs to get fixed.
Even quality silicone is not a permanent material. Constant exposure to water, cleaning products, temperature changes and movement can cause sealant to deteriorate.
You may notice:
* Cracking or splitting.
* Gaps between the silicone and tiles.
* Peeling or lifting.
* Mould developing within or around the seal.
* Areas where the silicone has become brittle.
When these signs appear, silicone shower seal replacement may be appropriate. But the condition of the surrounding grout and waterproofing system should also be considered.
Stubborn mould returning is one tell-tale sign that a shower seal is failing. Applying new silicone will get rid of any visibly mouldy sealant and improve the look of the area.
But if water continues to get into the area through cracked grout, poor ventilation or another source of water ingress, then the conditions mould thrives on could still be present. That’s why returning mould should never necessarily be considered a silicone issue.
The simplest way to think about silicone vs waterproofing is that they perform different jobs at different levels of the tiled system.
| Component | Where It Sits | Main Purpose |
|---|---|---|
| Silicone Sealant | Surface joints and changes of plane. | Creates a flexible, water-resistant seal. |
| Grout | Joints between tiles. | Fills and protects tile joints. |
| Waterproofing Membrane | Beneath the tiled surface. | Helps prevent water entering the underlying structure. |
| Tiles | Finished surface. | Provides the visible, durable surface of the wet area. |
These components work together, but one cannot automatically replace another. For example, replacing silicone does not recreate a failed waterproofing membrane. Likewise, regrouting a shower is not a way of repairing a membrane that has been confirmed as defective.
This is why an inspection should establish what has actually failed before repair work begins.
People often ask us to clarify the distinction between resealing and regrouting a shower. While these terms are sometimes used interchangeably, they are very different types of work. Shower resealing typically means taking out old failed sealant and replacing it with fresh silicone in the necessary joints.
Regrouting would mean taking out existing damaged grout within the tile joints and replacing it with new grout. Sometimes this work is done in conjunction with silicone replacement work where necessary.
A good example would be if the silicone along the edge of a shower base has failed, but the rest of the grout throughout the shower is sound. In a case like this, shower resealing may be suitable.
If the grout itself is cracked, broken, powdery or allowing water to pass through. Shower regrouting would be required instead. Also, if you notice signs that there is a bigger problem with waterproofing or the substrate, we wouldn’t offer shower sealing or regrouting as a ‘complete’ solution without investigating further.
You can’t always tell whether a waterproofing membrane has failed by looking at the silicone alone. Signs that water may be penetrating further into the tiled system include leaking that persists after previous attempts to re-seal the shower, damp occurring outside of the shower itself or water damage in a room adjacent to or below the shower.
Excessive or recurring mould and moisture build-up also merits further investigation if surface-level remedies haven’t solved the problem. Loose tiles or tiles that sound hollow when tapped, cracking that persists after repairs have been made to the surface or obvious signs of water penetrating under tiles are other indications.
However, these are not by any means certain indicators that the waterproof membrane has failed. As most of these symptoms are also caused by degraded grout, sealant failure and plumbing issues, amongst other defects.
This is why it’s important to establish exactly where the water is coming from before determining whether a full waterproofing replacement is required. Some systems may be perfectly intact but have compromised grout or sealant, allowing water to pass through. Others may show signs of failure further down that necessitate a full replacement.
It depends. Just because your shower leaks does not always mean the tiles will need to come out. If the issue is due to degraded grout, failed silicone, or another cosmetic issue, you may be able to repair the area without demolishing your bathroom.
That’s why we always recommend getting your shower assessed before you think it needs to be replaced. As experts in shower repairs and regrouting around Melbourne, our goal is to fix any leak that we can without ripping out tiles. If the waterproofing membrane beneath the tiles is still intact, then re-grouting and re-sealing affected areas can be a great solution rather than demolition and starting from scratch.
Of course, some leaking showers do require a full repair with tiles being removed. Should the underlying waterproofing membrane be compromised, or if the substrate has sustained considerable damage or movement, a more comprehensive repair will be necessary.
The same principle applies outdoors, but balconies have additional challenges because they are exposed to rain, temperature fluctuations and greater environmental movement. When moisture penetrates a balcony, it can seem like you just need to redo the grout or sealant. But actually the water could be running into whatever layers exist under the tile.
However, it’s not always necessary to pull up tiles and start from scratch if you have a leaking balcony. The condition of your grout, joints, seals and what your original waterproofing system was used must all be taken into account.
When it comes to leaking balcony repair in Melbourne, getting it assessed will help you know whether isolated balcony regrouting and sealing is suitable or if your waterproofing needs more work.
We have repaired leaking balconies in the past where aged grout was the problem and simply regrouting with the right epoxy-based product gave it a new lease on life at Strategic Regrouting. Let us help you.
If you install new silicone and mould quickly reappears, consider looking beyond the sealant itself. The return of mould can be caused by ongoing moisture, inadequate drying or ventilation, crumbling grout or continued water ingress somewhere it shouldn’t be happening.
The surface silicone was applied to may also not have been properly prepared. Old mould, moisture or residue can affect a seal’s performance. For that reason, patching mouldy silicone with more silicone is rarely effective in the long-term.
Old sealant needs to be fully stripped away, the area inspected, and then resealed on a clean, suitable surface. If mould continues to be a problem after you’ve replaced your shower seal, consider having your shower assessed for other water ingress points.
Silicone has an important role in protecting tiled wet areas, but it should not be treated as a cure-all for leaks. A cracked silicone joint may genuinely be the problem. In other cases, deteriorated grout may be allowing water to pass through the tiled surface.
And where there is evidence of membrane or substrate failure, surface-level repairs will not address the underlying cause. The difference matters because repeatedly resealing the same area without identifying why it is leaking can mean more time, more expense and continued water damage.
Showers don’t have a set interval when silicone needs replacing. Factors including shower silicone quality and application, cleaning methods, moisture levels and movement in the joint will affect lifespan.
Provided mouldy or deteriorated silicone is the root cause of the leak, replacing it can fix the problem permanently. Silicone won’t fix leaks caused by damaged grout joints, faulty plumbing, failed membranes or other issues.
Resealing refers to replacing silicone sealant around joints and at changes of plane. Regrouting involves removal of damaged grout between tiles, then replacement. Many showers will need both during a repair.
There is no single visible symptom that proves a waterproofing membrane has failed. Persistent leaks after surface repairs, dampness outside the shower, water damage and other signs of deeper water ingress can indicate that further investigation is needed. An assessment is required to distinguish membrane problems from failed grout, silicone or other causes.
Not necessarily. Silicone replacement can address failed sealant at specific joints, but it will not repair deteriorated grout or a failed waterproofing system underneath the tiles. A leaking balcony should be assessed to establish where water is entering before deciding on the repair.
In some cases, yes. Where the cause is deteriorated grout or failed sealant and the underlying system remains sound, targeted repairs may be possible without removing the tiles. More extensive damage or confirmed membrane failure may require a different approach.
Mould that keeps returning despite regular cleaning and resealing could be a sign that moisture isn’t able to dissipate properly, there’s damaged grout or leaks have occured beneath the tiles. If mould persists after shower sealing, get the shower assessed rather than repeatedly resealed.
Need shower regrouting Melbourne? A leaking shower repair? Balcony in distress? Whatever tile repairs you need done, it’s important to first know what has gone wrong and select a repair suited to the problem.
At Strategic Regrouting, we’re the Melbourne regrouting specialists for leak repair services covering the city and its surrounding suburbs such as Brighton, Elwood, Richmond, South Melbourne, Port Melbourne, Toorak, Middle Park, Albert Park, Balaclava, Caulfield, Bentleigh, Hampton, Hawthorn, Malvern, St Kilda, and Windsor. Our team checks the tiles to pinpoint the exact repair needed, as opposed to believing every shower leak requires waterproofing.
Call Strategic Regrouting today about your leaking shower or balcony with signs of water ingress. We will assess the damage and provide you with a free quote.