Your bathtub looks fine – until it doesn’t. One morning you notice a dark line where the tub meets the wall. You scrub it. It won’t come off. That’s mold, and it’s living behind your old, cracked caulking. Here’s the thing – a small caulking problem left alone becomes a water damage problem, and that’s a completely different conversation.
We do silicone caulking in Toronto every week across the GTA, and the story is almost always the same: homeowners wait too long, the water gets in, and what could’ve been a $200 fix turns into something much bigger. Don’t let that be your bathroom.
Why Silicone Caulking Fails – And When to Replace It
Most caulking in Toronto homes lasts 5-10 years before it starts cracking, shrinking, or turning black. Bathroom caulking takes a beating every single day – hot showers, humidity, soap scum, cleaning products. Eventually it breaks down, and when it does, water gets in behind your tile, into your drywall, under your flooring.
We’ve seen bathrooms where the caulking looked fine on the outside but there was a full inch of mold growing behind the tile. That’s a $3,000 problem that started as a $200 caulking job.
Signs it’s time to replace your bathtub caulking:
- Dark spots or black streaks that won’t scrub off
- Caulking pulling away from the wall or tub
- Visible cracks or gaps in the bead
- A musty smell in your bathroom even after cleaning
- Caulking that looks yellowed or discoloured
Silicone vs. Acrylic Caulking – Which One Does Your Bathroom Actually Need?
Let’s be honest – most DIY stores sell you acrylic latex caulking and call it a day. It’s paintable, cheap, and fine for baseboards or window trim. But your bathtub? That’s a different story.
For wet areas like bathtubs, showers, and around sinks, you want 100% silicone caulking. Here’s why:
- Silicone is fully waterproof. Acrylic absorbs moisture over time. Silicone doesn’t.
- Silicone stays flexible. Bathtubs shift and flex with weight and temperature changes. Silicone moves with them. Acrylic cracks.
- Silicone resists mold better. Most silicone products have anti-mold compounds built in.
The truth is, a lot of homeowners – and even some contractors – use acrylic because it’s easier to apply. It sands smooth, it paints over. But in a wet zone, you’ll be redoing it in 2-3 years. If you’re getting a proper caulking service in Toronto, silicone is the right call every time.
Can You DIY Silicone Caulking?
Technically, yes. But here’s where most people go wrong:
- They don’t remove the old caulking properly. If you caulk over existing caulking, the new bead won’t bond and you’ll have the same problem in six months.
- They don’t dry the surface completely. Silicone needs a fully dry surface to cure. Even a little moisture prevents proper adhesion.
- They use the wrong caulking gun. Cheap guns give uneven pressure, which means an uneven bead.
- They don’t finish it properly. Smoothing the bead with a wet finger takes practice. Get it wrong and it looks worse than before.
We’re not saying don’t try. We’re saying know what you’re getting into. If the existing caulking is heavily molded or you see loose tile or damp drywall behind it, that’s not a DIY job.
What Our Caulking Service Actually Involves
When our team comes out to do a bathtub or shower caulking job in Toronto, here’s what actually happens – no shortcuts:
- Full removal of old caulking – We use oscillating tools, scrapers, and chemical removers to get every bit out.
- Surface prep – We clean the joint thoroughly, treat any surface mold, and let it fully dry before touching the new silicone.
- Tape and apply – Painter’s tape goes on both sides for a clean edge, then we apply a smooth, consistent bead of 100% silicone.
- Smooth and finish – The bead gets tooled smooth for a professional waterproof seal.
- Cure time guidance – We let you know how long before the tub or shower can be used. Typically 24-48 hours for full cure.
Most bathtub caulking jobs in Toronto are done in a single visit, usually 2-4 hours depending on the scope of the work.
Where in the Bathroom Does Caulking Matter Most?
People think about the bathtub, but caulking shows up in more places than most homeowners realize:
- Bathtub-to-wall joint – The most common spot and the one that fails most often
- Shower floor and walls – Especially corners and the threshold
- Around the toilet base – Prevents odors and water from seeping under
- Sink and countertop joint – Especially in older kitchens and bathrooms
- Vanity backsplash – Behind your faucet where water always splashes
If you’re doing a bigger bathroom refresh, you might also be looking at a vanity installation or tile installation – and proper caulking is always part of those jobs.
Caulking After a Bathroom Renovation
We do a lot of caulking as part of bigger bathroom jobs. After a shower installation or bathtub installation, the caulking is the final seal that makes everything waterproof. It’s also the step that gets skipped or rushed on cheap installs. If you had work done 5 years ago and you’re seeing water damage now, check the caulking first – especially in the corners.
Mold Behind the Caulking – What To Do
This comes up more than people expect. You peel back old caulking and there’s black mold on the surface – sometimes going into the drywall behind the tile.
If it’s surface mold – just on the tile or tub surround – we can treat it during prep. If it’s gone into the drywall, that needs mold removal service before we seal anything. We always check. We won’t slap new caulking over a mold problem. That just hides it for a few months.
What Does Silicone Caulking Cost in Toronto?
Most bathtub caulking jobs run between $150-$350 depending on how much caulking needs replacing, whether there’s mold treatment involved, and how accessible the work area is. That might sound like a lot for just caulking – but compare it to what water damage repair costs. We’ve seen $150 caulking jobs save homeowners from $5,000 in drywall and flooring damage.
We Serve All of the GTA
Our caulking crews work across the entire Greater Toronto Area. Whether you’re in a downtown condo or a house in the suburbs, the process and quality is the same. We serve homeowners in Toronto, North York, Vaughan, Richmond Hill, Markham, Aurora, Newmarket, Mississauga, and Brampton.
Ready to Get Your Caulking Done Right?
If your bathtub or shower caulking is cracked, moldy, or pulling away – don’t wait. Water damage gets worse fast, especially in Toronto winters when the house is closed up tight. Our team is ready to come out, assess the job, and get it sealed properly the same week.
Call us at 647-657-6367 or get a free quote online. We’re available across Toronto and the GTA, and we’ll get it done right the first time.
