Caulking & Sealants That Stop Water Damage Before It Starts
Failed caulking is the #1 source of preventable water damage and energy loss in a building. We cut out the worn sealant, re-seal every joint with commercial-grade product, and prove the work with before and after photos.
What is caulking & sealants at Master Building Services?
TL;DR. Master Building Services provides commercial caulking and sealant replacement across Toronto and the GTA, cutting out failed sealant and re-sealing windows, doors and control joints with before-and-after photo proof. Every project runs under one master service agreement with one COI, one WSIB clearance and flat-rate multi-year pricing.
Caulking and sealants are the flexible joints that keep water and air out of a building envelope at every window, door, control joint and penetration. Caulking fails quietly. A cracked bead along a window or door joint never files a work order, but it lets wind-driven rain into the envelope and heated air out of it, and every GTA freeze-thaw cycle pushes the opening a little wider. The warning signs reach property managers secondhand: drafty units, creeping energy bills, visible cracking along the sealant lines. Buildings 10 years and older are where it shows up most, and the same units often need window cleaning and pressure washing to expose the full extent of the staining around the failed joints.
Master Building Services treats re-caulking as envelope work, not touch-up. Crews remove the worn sealant from windows, doors, control joints and penetrations, then re-seal with commercial-grade products, and every section is documented with before and after photos so your board can see exactly what was replaced and where. It all runs under one master service agreement: one COI, one WSIB clearance, one monthly invoice, one account manager. Drafts stop, and energy bills come down with them. For a detailed look at how GTA freeze-thaw cycles affect commercial sealants and when to schedule re-sealing on a high-rise, see our commercial caulking guide for Toronto high-rises.
What's included
- Removal of worn sealant on windows, doors and control joints
- Re-sealing of envelope penetrations with commercial-grade products
- Before and after photos of every section we re-seal
- Photo-verified completion report after every visit
- Documented hazard assessment before work begins
- Working at Heights trained crews on every elevation
- One COI and one WSIB clearance under your master agreement
What does a commercial sealant project actually involve?
It starts with an assessment, not a caulking gun. We walk the building, identify which sealant runs have failed and which are still serviceable, and deliver a quote for the actual scope within 48 hours, guaranteed. Buildings that want a broader picture often start with an exterior inspection first, a photo-documented review of the façade, drainage and accessible roof areas that flags every defect, including sealant failures, with a prioritized fix list you keep regardless of what you decide to act on.
On the job, crews cut out the failed material completely rather than running a cosmetic bead over top, then re-seal windows, doors, control joints and penetrations with commercial-grade product. Each section is photographed before and after, and the project closes with a photo-verified completion report you can file or forward to the board. Crews are Working at Heights trained and WSIB covered, carry $5M in liability coverage, and complete a documented hazard assessment before anyone touches the wall. Where the same elevation needs other envelope work, exterior painting and repairs and maintenance can run in the same campaign so the crew is on site once.
Why does timing matter in a freeze-thaw climate?
Water finds an open joint, freezes, expands, and pries the joint open further. That is the GTA winter working on your envelope from the first freeze to the last thaw, which is why failed caulking is the #1 source of preventable water damage and energy loss: the gap never stays the size it is today, and the heated air escaping through it shows up on the utility bill all season. Residents feel it as drafty units long before anyone sees damage.
The practical answer is to re-seal before winter, so the new sealant faces freeze-thaw season intact instead of cracked material giving water another year of entry. If the building is 10 years or older, if units run drafty, or if you can see cracking along the sealant lines, book the assessment now rather than after the next thaw shows up as a leak. Where the prep work uncovers failing paint or bare substrate around the sealed areas, exterior painting can follow under the same agreement so the wall is weatherproofed and refinished in the same campaign. If a leak has already made it inside, emergency and disaster recovery handles the water response while the envelope work is scheduled. And when sealant work joins a flat-rate multi-year agreement, the price holds, with no annual escalators.
Why property managers choose Master.
Proof you can forward
Most sealant lines sit too high to inspect from the ground, so we photograph every section before and after and close each visit with a photo-verified completion report, the same standard we apply to exterior inspections. Your board sees evidence, not a line item.
Insured at every height
Crews are Working at Heights trained and WSIB covered, with $5M in liability coverage and a documented hazard assessment before work starts. One COI covers the whole job, including any companion exterior painting on the same elevation.
One agreement, steady pricing
Caulking runs under the same master service agreement as the rest of your building, alongside window cleaning, janitorial and repairs and maintenance: one monthly invoice, one account manager, and flat-rate multi-year terms with no annual escalators.
Single-vendor patchwork vs the Master agreement
| Without a master contract | With Master Building Services |
|---|---|
| Separate caulking contractor with its own COI, its own WSIB clearance and a quote that takes a week to land. | Re-caulking runs under one master service agreement: one COI, one WSIB clearance, one quote within 48 hours, guaranteed. |
| Cosmetic bead run over old sealant that fails the next freeze-thaw and leaves no record of what was done. | Failed sealant cut out completely and re-sealed with commercial-grade product, documented section-by-section with before and after photos. |
| Sealant work priced separately from exterior painting and exterior inspections, with three vendors on three schedules. | Caulking sits beside inspections, painting and repairs and maintenance under one contract, one account manager, one monthly invoice. |
| Annual price escalators that push next year's re-sealing budget past what the board approved. | Flat-rate multi-year terms hold the price for the length of the agreement, with no annual escalators. |
| No documentation to show the board which joints were replaced or why winter water still found a way in. | Photo-verified completion report after every visit, with before and after photos your board can forward without follow-up. |
| Heights work handled by a sub you have not vetted, with insurance paperwork chased after the fact. | Working at Heights trained crews, $5M liability coverage and a documented hazard assessment before anyone touches the wall. |
Caulking & Sealants — questions property managers ask
Can you provide a COI and WSIB clearance before caulking work starts?
Yes. The work runs under one master service agreement, which means one COI and one WSIB clearance for your records, backed by $5M in liability coverage. Email info@masterbuildingservices.ca and a real person responds within 2 business hours.
Will re-caulking disrupt residents in our building?
Sealant work is scheduled within our Monday to Friday, 7am to 6pm hours and targets the building envelope: windows, doors, control joints and penetrations. A documented hazard assessment is completed before work begins, and your account manager keeps you ahead of the schedule so residents hear what is happening from you first.
How fast can we get a caulking quote and get scheduled?
A real person responds to your request within 2 business hours, and your quote is delivered within 48 hours, guaranteed. From approval, your account manager books the work into our Monday to Friday, 7am to 6pm window. If you are racing the first freeze, say so when you reach out.
Do we need a master service agreement just for caulking?
Caulking can be the first thing we quote for your building — tell us the re-sealing scope you need and the quote arrives within 48 hours, guaranteed. The work runs under a master service agreement, which is what gives you one COI, one WSIB clearance, one monthly invoice and one account manager, with flat-rate multi-year pricing and no annual escalators. If you want a no-obligation starting point first, request the free Building Health Report — you keep it even if you never hire us.
How do you decide which joints get replaced and which stay?
That is the job of the assessment: we walk the envelope and document which sealant runs have failed and which are still doing their job. If you want the full picture, the free Building Health Report covers the exterior envelope and interior common areas, photo-documented, with every finding ranked urgent, this year, or monitor. You keep the report even if you never hire us.
Find every failed joint before winter does
Cracked sealant does not heal over winter; it widens. Tell us about your building and a real person responds within 2 business hours, with your quote delivered within 48 hours, guaranteed.
Serving Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill and the entire GTA.