Bathroom Resealing & Silicone

Small joints, big consequences

Silicone joints are some of the smallest details in a bathroom, but they do an important job. They seal the junctions where walls meet floors, where tiles meet baths, vanities and shower bases, and where glass meets tile. These junctions move slightly as the house expands and contracts, so they cannot be grouted. Flexible silicone allows that movement while keeping water out.

Over time, silicone ages. It can discolour with mould, shrink, crack, lose adhesion or peel away from the surface. When that happens, water from every shower can find its way into the gap and behind the tiles. Left unchecked, it can lead to damaged substrates, swollen vanities and skirting, mould growth and, eventually, a failure of the waterproofing system beneath. Professional resealing is a simple, effective way to prevent that damage.

Signs your bathroom needs resealing

• Black or grey mould in silicone joints that will not clean off. Mould grows into the silicone itself, so surface cleaning only provides temporary improvement.
• Gaps, cracks or splits in silicone, particularly at the base of shower walls and around bath edges.
• Silicone peeling away from tile, glass or the bath.
• Water appearing outside the shower or under the vanity after use.
• Discoloured or swollen skirting, door jambs or vanity bases near wet areas.
• Grout that cracks repeatedly at internal corners, which often means a movement joint has been grouted rather than siliconed.
• A musty smell in the bathroom even after cleaning.

Where silicone belongs

Under Australian practice and the relevant Standards, flexible sealant should be used at:

• Internal corners of walls, including in showers.
• Wall-to-floor junctions around the room perimeter.
• Junctions between tiles and baths, shower bases, vanities and benchtops.
• Around the base of toilets, where appropriate.
• Where shower screens and glass panels meet tiles.
• Around penetrations such as tapware and shower arms, where specified.
• At movement joints across large tiled areas.

A common mistake in older bathrooms is grout at internal corners instead of silicone. Grout is rigid and cracks as the building moves, opening a path for water. Part of our resealing service is identifying these joints and converting them to flexible sealant.

Our resealing process

Inspection

We inspect all silicone and grout joints in the bathroom, look for signs of water escaping and check for hollow tiles or damage that suggests a deeper problem. If we believe the waterproofing has already failed, we will tell you honestly, because resealing alone will not fix a failed membrane.

Complete removal of old silicone

New silicone does not bond reliably to old silicone, and applying a fresh bead over mouldy or failing sealant traps mould and moisture underneath. We cut out and remove all old silicone, then remove the residual film with appropriate tools and solvents. This is the most time-consuming step and the one most often skipped by quick fixes.

Cleaning and mould treatment

Joints are cleaned thoroughly and treated to remove mould spores from the surrounding grout and tile edges. Any grout at internal corners is raked out so the joint can be correctly sealed.

Drying

Silicone needs a clean, dry surface to bond. Showers and baths that have been used recently can hold moisture in grout and joints. We allow joints to dry adequately before sealing, sometimes using fans, and we may ask you not to use the shower for a period beforehand.

Application

We apply a high-quality, neutral-cure sanitary silicone with mould inhibitors, selected to be compatible with your tiles, stone, acrylic or glass. Joints are masked where needed for crisp lines, the bead is applied at an appropriate size for the joint, and it is tooled to ensure full contact with both surfaces and a smooth, concave finish that sheds water.

Curing

Silicone needs time to cure before it gets wet. We will tell you how long to wait before using the shower or bath, which is typically at least a day depending on the product and conditions.

Silicone colour and finish

Silicone is available in clear, white, translucent and a wide range of colours to match grout. We recommend matching the silicone to your grout colour for a seamless look, or to the fixture where silicone meets a bath or basin. Clear silicone can discolour over time and shows mould more readily in some situations, so we generally prefer a colour-matched product.

Natural stone and specialist surfaces

Some silicones can stain natural stone such as marble, causing dark halos along joints. For stone, we use sealants specifically formulated to be non-staining. Acrylic baths and shower bases flex more than tiled surfaces, so we use sealants with suitable movement capability and may recommend filling the bath with water while sealing so the joint is set at its loaded position.

Resealing versus regrouting versus re-waterproofing

Resealing

Suitable when silicone has failed but grout and waterproofing are sound. Resealing stops water entering at movement joints.

Regrouting

If grout is cracked, crumbling or heavily stained, removing and replacing grout in affected areas can restore the surface. Our Tile & Grout Cleaning service covers deep cleaning and, where appropriate, regrouting.

Re-waterproofing

If water has already passed through a failed membrane, causing damage behind tiles, resealing will not solve the problem. The affected area needs to be stripped back, repaired, waterproofed to AS 3740 and retiled. We will explain clearly when this is required.

Resealing as preventative maintenance

Even in a well-built bathroom, silicone is a maintenance item. We recommend inspecting it once a year and resealing when you notice discolouration, gaps or peeling. Prompt resealing is a modest maintenance task that protects the much larger investment in your bathroom.

Local homes and common issues

In older Beaconsfield, Narre Warren and Berwick homes, we often find showers with grouted internal corners, acrylic shower bases with failed perimeter seals and baths where the silicone has pulled away. In hills homes around Upper Beaconsfield, Emerald and Cockatoo, cooler, damper conditions can encourage mould growth if ventilation is poor. In newer homes in Officer and Clyde North, builder-applied silicone may begin to fail within a few years, particularly in showers that see heavy daily use.

For landlords and property managers

Failed silicone is one of the most common causes of water damage in rental properties. Periodic resealing between tenancies, or as soon as a tenant reports an issue, helps protect the property. We can provide a written description of work completed for your records.

Improving ventilation to protect silicone

Mould in silicone is often a symptom of poor ventilation. If your bathroom stays damp for hours after showering, consider upgrading the exhaust fan or ducting it to outside. We can assess ventilation as part of our visit and recommend improvements.

The process

Inspection

We assess the condition of silicone, grout and surrounding areas and explain what we find.

Scope

You receive a clear written scope describing the joints to be resealed and any other recommended work.

Resealing

Old silicone is removed, joints are cleaned, treated and dried, and new silicone is applied and tooled.

Handover

We explain curing times and care, and recommend a maintenance schedule.

Book a resealing inspection

If your shower silicone is mouldy, cracked or peeling, or you have noticed signs of water escaping, book an inspection. We will tell you honestly whether resealing will solve the problem, and if it will, we will do it properly.

Why do-it-yourself resealing often fails

Resealing looks straightforward, and supermarket shelves are full of silicone tubes. Yet many DIY resealing jobs fail within months. The most common reasons are applying new silicone over the old bead, sealing joints that are still damp, using a general-purpose or acetic-cure product that is unsuitable for the surface, and leaving the bead sitting on top of the joint rather than tooling it into full contact with both sides. Each of these leaves a weak bond that peels or lets water track behind it.

Professional resealing is less about the tube and more about the preparation: complete removal, cleaning, mould treatment, drying and correct tooling. That preparation is what makes the new joint last.

Shower screens and glass panels

Where frameless or semi-frameless shower screens meet tiles or a shower base, silicone joints help seal the glass and stop water tracking out of the shower. Over time these joints yellow, grow mould or lift. When resealing glass, we take care to protect the glass coating and hardware, remove the old sealant without scratching the surface and apply a clear or colour-matched sealant suitable for glass. If seals or wipers on the door itself have deteriorated, we can discuss replacement through our Shower Screens service.

How long does resealing last?

The life of a silicone joint depends on the product, the quality of the preparation, how often the shower is used, cleaning habits and ventilation. In a well-ventilated bathroom cleaned with gentle products, a properly applied joint can last for years. In a heavily used, poorly ventilated shower, signs of wear may appear sooner. Annual inspection is the simplest way to stay ahead.

Choosing the right silicone

Not all silicone is suited to wet areas. We use a quality sanitary silicone with mould inhibitors, matched to the colour of your grout or fixtures, and we choose neutral-cure products where they suit natural stone. The right product, applied to a clean, dry joint with the correct profile, lasts far longer and stays cleaner than a general-purpose sealant.

Caring for new silicone

Avoid harsh bleach and abrasive scourers, which break down silicone and its mould inhibitors. Wipe joints dry after showering where practical, keep the exhaust fan running during and after showers, and clean with a soft brush and pH-neutral cleaner. These habits keep joints clean and extend their life.

Areas we service

• Bathroom Renovations Beaconsfield
• Bathroom Renovations Berwick
• Bathroom Renovations Cardinia
• Bathroom Renovations Clyde North
• Bathroom Renovations Cockatoo
• Bathroom Renovations Emerald
• Bathroom Renovations Gembrook
• Bathroom Renovations Guys Hill
• Bathroom Renovations Harkaway
• Bathroom Renovations Narre Warren North
• Bathroom Renovations Narre Warren
• Bathroom Renovations Officer
• Bathroom Renovations Pakenham
• Bathroom Renovations Upper Beaconsfield