Sealant Problems

16 06 2026

Why is my shower leaking through the floor?

Admin Bathroom & Shower, Sealant Problems

READING TIME

3 Minutes

Why is my shower leaking through the floor?

Finding water outside the shower or noticing damp patches on the ceiling below can be frustrating and worrying.

Many people immediately assume the shower tray is cracked or that plumbing behind the wall has failed. While that can happen, one of the most overlooked causes is actually failing sealant.

Small gaps in silicone around a shower tray, enclosure, screen, or tiled joints can allow water to slowly escape behind surfaces. Over time, even a minor leak can become a much bigger problem.

Common Reasons a Shower Starts Leaking

A leaking shower isn’t always obvious at first.

You may notice:

water appearing on the bathroom floor
damp smells
peeling paint downstairs
staining on ceilings
mould developing around the shower
silicone becoming black or detached

Several issues can cause this.

Failed Silicone Sealant

This is one of the most common causes.

Silicone sealant around shower trays and enclosures naturally ages over time. Daily exposure to water, cleaning products, movement, and temperature changes gradually reduces its performance.

Signs of failed sealant include:

cracks appearing
sealant pulling away
gaps forming
black mould returning repeatedly
uneven joints

Once water starts finding a route behind the silicone, leaks often become worse gradually rather than suddenly.

Gaps Around the Shower Tray

Movement in floors and normal use can sometimes create small separations between the tray and surrounding surfaces.

Even tiny openings may allow surprising amounts of water to escape over time.

Professional resealing can often solve the issue before more extensive repairs become necessary.

Damaged Grout or Wall Joints

People often focus on the shower itself and forget surrounding surfaces.

Cracked grout, damaged corners, and deteriorated joints can allow moisture behind tiles where it may travel before becoming visible elsewhere.

Plumbing Issues Behind the Wall

If sealant appears in good condition but leaking continues, plumbing connections behind walls may require investigation.

Typical signs include:

leaking even without shower use
unexplained water pressure changes
persistent damp areas

When Should You Replace Shower Sealant?

You should consider replacing shower sealant if:

mould keeps returning
silicone feels loose
visible gaps appear
water escapes during use
sealant looks brittle or aged

Waiting too long can allow moisture to affect surrounding materials and increase repair costs.

Can You Seal Over Existing Silicone?

Applying fresh silicone over old sealant rarely produces a reliable result.

Old contamination, trapped moisture, and poor adhesion underneath often cause the new sealant to fail more quickly.

Professional removal before replacement generally produces a cleaner and longer-lasting finish.

Preventing Future Shower Leaks

Simple maintenance can help extend sealant life:

Keep shower areas ventilated
Remove standing water where possible
Check joints periodically
Replace deteriorated sealant early
Avoid excessive aggressive cleaning products

Sealant is often one of the smallest details in a bathroom until it stops doing its job.

Need Professional Shower Resealing?

If your shower is leaking, mould keeps returning, or your sealant looks past its best, ROSEAL provides professional sealant replacement designed to help restore waterproof protection and improve appearance.

01 06 2026

Why is my shower leaking around the tray?

Admin Bathroom & Shower, Sealant Problems

READING TIME

Less than 1 minute Minutes

Why Is My Shower Leaking Around the Tray?

A leaking shower isn’t always caused by faulty plumbing.

In many cases, the problem starts with something much simpler — failed sealant around the shower tray, enclosure, or surrounding joints. What often begins as a small gap or crack can gradually allow water to escape behind surfaces, leading to damp patches, mould growth, and damage that isn’t immediately visible.

The good news? In many situations, the solution is far less disruptive than homeowners expect.

The Most Common Cause of Shower Leaks

Shower trays and enclosures are designed to keep water contained within the shower area. The sealant surrounding these joints plays a vital role in preventing moisture from escaping.

Over time, silicone can begin to:

Crack
Shrink
Peel away from surfaces
Develop mould
Lose flexibility

Once gaps appear, even small amounts of water can work their way behind the tray or wall panels.

Because this often happens gradually, many homeowners don’t notice the problem until signs of damage start appearing elsewhere.

Signs Your Shower Sealant May Be Failing

One of the easiest ways to identify a sealant issue is by inspecting the silicone around the shower tray.

Common warning signs include:

Black mould within the sealant
Cracked or split silicone
Peeling edges
Discolouration
Visible gaps between surfaces
Water collecting outside the shower area

If any of these issues are present, the sealant may no longer be providing effective waterproof protection.

Could the Leak Be Coming From Somewhere Else?

Possibly.

While failed silicone is one of the most common causes of shower leaks, there are situations where the issue may be related to:

Damaged grout
Plumbing connections
Faulty shower trays
Loose fittings
Structural movement

A professional inspection can usually identify whether the sealant is the source of the problem or if further investigation is required.

Why Adding More Silicone Isn’t Always the Answer

A common mistake is applying new sealant directly over old silicone.

Although it may appear to solve the problem temporarily, old sealant often contains trapped moisture, mould, and weakened adhesion. Applying fresh silicone over the top can result in poor bonding and further failure.

For long-lasting results, the existing sealant should be fully removed before new silicone is applied.

Can Mouldy Silicone Be Cleaned or Should It Be Replaced?

What Happens If You Ignore It?

Small leaks have a habit of becoming larger problems.

Water penetrating behind shower trays or wall panels can eventually lead to:

Damp patches
Mould growth
Damaged plasterboard
Loose tiles
Stained surfaces
Costly repairs

Addressing failing sealant early is often far more affordable than repairing water damage later.

When Should Shower Sealant Be Replaced?

There is no exact lifespan because every bathroom experiences different levels of use, ventilation, and moisture exposure.

However, if the sealant is visibly mouldy, cracked, peeling, or allowing water to escape, replacement is usually the most effective solution.

Professional resealing restores the waterproof barrier while improving the overall appearance of the shower area.

Professional Shower Resealing Services

ROSEAL provides professional shower resealing services across the South West, replacing failed silicone with premium-quality sanitary sealants designed for durability and long-term performance.

Whether you’re dealing with mouldy silicone, visible gaps, or a suspected shower leak, replacing deteriorated sealant can help protect your bathroom and prevent further problems from developing.

Areas We Cover

ROSEAL provides professional silicone services throughout Somerset, Bristol, Dorset, Devon, Wiltshire, and Hampshire, including Yeovil, Taunton, Bridgwater, Weston-super-Mare, and Bath.

27 05 2026

Can mouldy silicone be cleaned or should It be replaced?

Admin Bathroom & Shower, Sealant Problems

READING TIME

Less than 1 minute Minutes

Can Mouldy Silicone Be Cleaned?

Mould on bathroom sealant is one of the most common problems homeowners experience. While surface staining can sometimes be improved with cleaning products, mould that has penetrated deep into the silicone usually cannot be fully removed permanently.

This is why black staining often returns shortly after cleaning.

When Silicone Should Be Replaced

Sealant replacement is usually recommended when:

mould keeps returning
silicone is cracked or peeling
joints are separating
water can reach behind surfaces
the sealant looks permanently stained

Replacing failed silicone properly helps restore waterproof protection and improves the overall appearance of the bathroom or kitchen.

Why Replacing Sealant Properly Matters

Applying fresh silicone over old mouldy sealant rarely solves the problem long-term. Existing contamination and weak adhesion underneath can quickly lead to further failure.

Professional removal and replacement creates a cleaner finish and more durable result.

Professional Silicone Replacement Services

ROSEAL provides bathroom resealing, shower sealing, kitchen silicone replacement, and commercial sealant services across the South West.

26 05 2026

Why does bathroom silicone turn black?

Admin Bathroom & Shower, Sealant Problems

READING TIME

Less than 1 minute Minutes

Why Does Bathroom Silicone Turn Black?

Black marks around bathroom silicone are usually caused by mould growth developing within old or failing sealant. Bathrooms naturally create moisture, heat, and condensation, especially around showers, baths, and sinks. Over time, this creates the perfect environment for mould to grow inside silicone joints.

In many cases, cleaning products may temporarily improve the appearance, but once mould has penetrated the sealant itself, replacement is often the best long-term solution.

Common Causes of Black Silicone

Several things can contribute to bathroom sealant turning black:

poor ventilation
trapped moisture
ageing silicone
incorrect sealant application
low-quality sealant materials

Bathrooms without proper airflow are especially prone to mould growth around showers and baths.

Can Black Silicone Be Cleaned?

Surface mould can sometimes be cleaned temporarily, but deeply stained or mould-contaminated silicone usually needs replacing. Once mould develops beneath the surface, it can continue returning even after repeated cleaning.

Professionally replacing failed sealant helps restore both appearance and waterproof protection.

When Should Silicone Be Replaced?

Signs your bathroom sealant may need replacing include:

black mould staining
cracked silicone
peeling edges
gaps forming around joints
water leaking behind surfaces

Ignoring failed sealant can eventually lead to moisture damage behind tiles, trays, and bathroom fittings.

Professional mastic man applying sealant in a bathroom to prevent leaks.

Professional Bathroom Resealing

ROSEAL provides professional bathroom resealing services using premium sanitary-grade silicone designed for long-lasting mould resistance and waterproof protection.

If your bathroom sealant is starting to fail, replacing it early can help prevent more expensive problems later on.

Professional applying fresh silicone sealant for a smooth, waterproof finish.

14 11 2024

Top Signs It’s Time to Replace Your Silicone Sealant

Admin Sealant Maintenance, Sealant Problems

Top Signs It’s Time to Replace Your Silicone Sealant

Silicone sealant is essential for keeping bathrooms, kitchens, and other areas in your home watertight and protected from damp. However, even the best-quality sealant has a limited lifespan. Over time, factors like moisture, temperature changes, and simple wear and tear can lead to deterioration. Recognising when silicone sealant needs replacing can prevent water damage, mould growth, and maintain the aesthetic of your space.

In this guide, we’ll cover the top signs that your silicone sealant may need replacing and provide tips for keeping your home in excellent condition.

Cracking and Splitting

One of the most obvious signs that your silicone sealant has reached the end of its life is cracking or splitting. Silicone is designed to be flexible, but as it ages, it can become brittle and lose elasticity. This is particularly common in high-moisture or high-temperature environments like bathrooms and kitchens, where sealant is frequently exposed to water and steam.

Why Cracking Matters

Cracks in sealant allow water to seep into the surfaces beneath, leading to potential damage to walls, tiles, and fixtures. Even minor cracks can let moisture through, making it vital to inspect and replace any compromised sealant before the problem worsens.

Peeling or Pulling Away from Surfaces

If you notice your silicone sealant pulling away from the edges of tiles, sinks, or other surfaces, it’s a clear indication that it’s no longer providing a proper seal. Over time, changes in temperature and humidity can weaken the bond between the sealant and the surfaces it’s protecting, causing it to detach or peel.

The Risks of Peeling Sealant

Gaps left by peeling sealant allow moisture to gather in hard-to-see places, fostering mould and potentially causing rot if left unchecked. Replacing peeling sealant as soon as possible helps prevent larger, costlier issues down the line.

Persistent Mould and Mildew

Mould growth is a common issue with silicone sealant in damp areas. Many silicone sealants have anti-mould properties; however, even mould-resistant sealants are not immune to mould over time. If you notice black spots or discolouration that can’t be scrubbed away, it may be time to replace the sealant.

Why Mould is a Serious Issue

Mould not only looks unpleasant, but it can also cause health issues, especially for those with respiratory conditions or allergies. Replacing mould-ridden sealant ensures a cleaner, healthier environment in your home, especially in areas like bathrooms or around kitchen sinks where hygiene is essential.

Discolouration

Discolouration, such as yellowing or browning, is a sign that your silicone sealant has aged or reacted with cleaning products over time. Discoloured sealant can detract from the overall look of your bathroom or kitchen, making it appear dated or unclean, even if it’s well-maintained.

When Discolouration Indicates Replacement

Discolouration doesn’t always compromise the function of the sealant, but it can be an early sign of wear. If you’re trying to maintain a clean, fresh look in your home, replacing discoloured sealant can make a noticeable difference. For those who prefer a polished, new appearance, fresh sealant will give a cleaner, brighter look to your space.

Loss of Flexibility

Silicone sealant is known for its flexibility, allowing it to expand and contract with temperature changes. However, over time, silicone can harden and lose its flexibility, making it more susceptible to cracking and peeling. When you press on the sealant, it should have some give; if it feels firm or brittle, it may have lost its flexibility and needs to be replaced.

Why Flexibility is Important

In areas like showers, around sinks, or along windows, flexible sealant ensures a tight bond that can adapt to movement. Hard or brittle sealant lacks this adaptability, increasing the risk of gaps forming and moisture seeping through.

Loss of Flexibility

Why Flexibility is Important

Age of the Sealant

Even if you don’t see visible signs of wear, silicone sealant should generally be replaced every 5-10 years. Exposure to various elements like water, cleaning chemicals, and fluctuating temperatures gradually breaks down silicone’s effectiveness over time. Regularly replacing your sealant as it ages helps prevent potential issues before they arise.

Proactive Maintenance

If it’s been several years since you last replaced your sealant, it’s worth considering a fresh application. This approach keeps your home’s waterproofing intact and reduces the likelihood of any hidden issues cropping up unexpectedly.

DIY vs. Professional Replacement

Replacing silicone sealant can be done as a DIY project, but achieving a smooth, professional finish takes practice and precision. For those who want a perfectly applied seal or are dealing with hard-to-reach areas, hiring a professional mastic man can provide a superior finish that lasts longer. A professional will ensure that the old sealant is thoroughly removed and that the new application is seamless, maximising its lifespan and effectiveness.

Tips for Maintaining Your Silicone Sealant

To prolong the life of your silicone sealant, consider these maintenance tips:

Clean Regularly: Regularly clean sealed areas with mild, non-abrasive cleaners to prevent mould and maintain appearance.
Ventilate Damp Areas: Use ventilation fans or open windows to reduce moisture build-up in bathrooms and kitchens, which helps prevent mould and mildew on the sealant.
Inspect Periodically: Check sealant in high-use areas like showers and sinks for early signs of wear. Catching small issues early on can save time and money on replacements.

Silicone sealant is an essential part of maintaining a watertight, healthy, and attractive home. Knowing the signs of ageing or failing sealant—from cracking and peeling to persistent mould growth—can help you address issues before they lead to costly repairs. Whether you’re up for a DIY job or prefer the expertise of a professional, keeping your sealant in good condition is a wise investment in your home’s longevity and comfort.