Can caulking be done year-round?

Yes. We caulk exteriors year-round; our products are rated for application down to −27°C. Wet weather is the only limitation, as moisture can interfere with adhesion. We schedule work around rain to ensure proper curing and performance.

Residential Caulking in Toronto & Vaughan — Window & Door Re-Caulking Specialists

Safeguard your home against the elements

Let our expert team help you maintain the integrity of your property with our professional residential caulking services. Don’t wait until it’s too late – invest in the longevity and comfort of your home today with Costa Caulking!

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Our Residential Caulking Process

How we Help Homeowners

We will arrange a visit to see your home. In some cases, no one is required to be home for the quote.

1. Remove Failing/Cracked Caulking

We’ll meticulously remove old caulking around windows, doors, vents, and pipes. Fresh starts begin with clean surfaces.

2. Install Closed-Cell Backer Rod or Spray Foam

We install closed cell foam backer rod to create a nice tight envelope around the window. Then we seal to keep the elements out of your cozy home.

3. Apply Commercial-Grade Sealant

We use commercial grade caulking. Dowsil & Tremco, offer a long lasting and durable seal. We also give you a 10 YEAR WARRANTY. Say goodbye to leaks and drafts!

4. Neat Finishing & Debris Cleanup

We tool clean, consistent lines for a professional look, remove debris, and leave the work area tidy.

5. Free Critter Prevention Walk-Around

Our experts will conduct a thorough inspection to identify areas where critters like bugs and mice can sneak in. Safeguard your home against unwelcome guests.

10 year no crack, no peel guarantee.

“If you experiencing cracking or loss of adhesion we will come and repair it for *free. *Full home recaulking required

Why Homeowners Choose Our Residential Caulking Service in the GTA

At Costa Caulking we specialize in delivering top-notch residential caulking services to safeguard your home against the elements. Our expert team understands the importance of maintaining the integrity of your property, which is why we offer meticulous caulking solutions tailored to your needs.

Proper caulking is essential for maintaining the structural integrity and energy efficiency of your home. By sealing gaps and cracks, caulking prevents moisture infiltration, drafts, and heat loss, ultimately saving you money on energy bills and costly repairs down the line.

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Fully Insured/ Licensed

Costa Caulking is a fully insured caulking contractor.

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10 Year Warranty

Have peace of mind knowing our products provide a high-quality, long-lasting seal. Conditions Apply. Ask for details.

Meet the Family Behind the Work

Costa Caulking is proudly led by the next generation of a family with over 50 years of industry experience. The brothers behind the name carry forward a legacy of precision, professionalism, and pride in every project — including your home.

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Residential Caulking FAQs

What areas of my home should be professionally caulked?

Professional caulking helps seal the joints and gaps that naturally occur around your home. At Costa Caulking, we commonly apply high-performance sealants around windows, doors, siding joints, baseboards, bathtubs, showers, and kitchen backsplashes. We also seal exterior expansion joints, trim gaps, and other areas exposed to drafts or water. Proper caulking not only improves appearance but also prevents moisture intrusion, drafts, and costly long-term damage.

Why is professional caulking better than DIY?

While store-bought caulking may seem straightforward, proper surface preparation, product selection, and application technique make a major difference. Our team uses professional-grade materials designed for long-term flexibility, adhesion, and weather resistance. We clean, prep, and tool each joint precisely so your caulking lasts — without cracking, peeling, or discoloration. Professional caulking not only looks cleaner but also keeps your home sealed against water, air leaks, and energy loss.

Can you apply new caulking over old caulk?

It’s generally not recommended. New caulking won’t bond properly to old, deteriorated material and will likely fail early. At Costa Caulking, we always remove old caulk completely before applying new sealant. This ensures maximum adhesion, a cleaner finish, and a longer-lasting seal. In rare cases where full removal isn’t possible, we assess whether partial removal is appropriate — but only if it meets our quality standards.

What’s the difference between caulking and sealant?

While the terms are often used interchangeably, there’s a key difference. Caulking is more rigid once cured and is often used for interior gaps or finishing work. Sealants, by contrast, remain flexible and are designed for joints that expand and contract — like those around windows, siding, or concrete. Costa Caulking uses both depending on the environment to ensure your home remains sealed, protected, and visually clean.

How long does professional caulking last?

When properly applied, professional-grade caulking can last anywhere from 5 to 15 years, depending on exposure, surface conditions, and material type. Silicone and polyurethane sealants typically last longest, while interior acrylic or latex products may need replacement sooner. We choose materials that suit the specific area — ensuring durability, weather resistance, and long-term protection for your home.

What type of caulking is best for bathrooms, kitchens, or exterior joints?

Bathrooms and kitchens benefit from 100% silicone sealants, which resist moisture, mold, and mildew. For exteriors, we typically use silicone as well, due to its flexibility and weather resistance — but in restoration projects where the surface or façade will be painted, we use a high-performance urethane, since urethane is paintable. Every sealant we use is selected to perform reliably in Canadian climates.

Can professional caulking be done year-round?

Yes. Costa Caulking performs exterior caulking year-round, as our sealants are rated for application in temperatures as low as -27°C. The only conditions that prevent proper work are wet or rainy weather, since moisture can interfere with adhesion. We schedule accordingly to ensure every project is completed to our standards — no matter the season.

Do you use low-VOC or eco-friendly sealants?

Yes. We can use low-VOC or LEED-compliant products upon request, but most of our standard sealants are already low-VOC. These products are safer for homeowners and the environment without compromising performance, flexibility, or lifespan.

Can mold grow through old or cracked caulking?

Yes. When caulking deteriorates, moisture can seep behind it and create the perfect environment for mold growth. This is especially common in bathrooms, kitchens, and around windows. Replacing old or cracked caulking helps eliminate these risks. We use mold-resistant sealants and ensure all surfaces are clean and dry before applying new material.

How do I know when my caulking needs to be replaced?

Signs that it’s time to replace caulking include visible cracks, peeling, or gaps. You may notice drafts near windows, water damage, or condensation around frames. In damp areas, dark spots or mildew are early warnings of failed caulking. If you’re unsure, Costa Caulking can inspect your home and provide a clear assessment and estimate.

Satisfaction Guaranteed

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