Montreal window caulking that stops water and air leaks

Cracked, shrunken or missing caulking around your windows lets wind-driven rain and cold winter air pour straight into the wall. We strip the old bead, then lay fresh exterior and interior sealant rated to stay flexible in deep cold — tooled clean, watertight and draft-free.

Every opening measured on-site

Full air-seal on every unit

Written frame + sealed-glass warranty

Fresh sealant that protects the wall

Caulking is the weather seal between the window frame and the surrounding wall — the flexible bead that keeps water and cold air out of the joint. Our freeze-thaw winters are hard on it, and when it shrinks, hardens or pulls away, wind-driven rain and cold winter air find the gap. Left alone, water behind the frame rots the sill and wall studs, so failed caulking is far more than a cosmetic issue.

Fresh exterior and interior sealant seals both the opening and the frame, and it pairs well with weatherstripping on the moving sash and foggy sealed unit repair when the glass has blown. If the frame is already water-damaged, our window repair crew will flag it and quote the fix before we seal.

From free measure to fresh sealant in four steps

Book the estimate

Call, text or use the form. We book a free in-home visit — no obligation, no high-pressure sales table.

On-site measure

We measure every opening, check the frames and sills for rot or water damage, and walk through material, style and glass options in plain language.

Written quote

Line-item quote with the window line, glass package, U-factor, warranty and haul-away on one page. Financing attached when you want it.

Install, cleanly

Drop cloths, boot covers and a full air-seal on every unit. Old windows hauled away and a walkthrough of your new windows plus warranty registration.

Watertight joints, no drafts, no rot

We strip the cracked or peeling caulking and lay fresh, flexible sealant rated for our temperature swings — a product that stays elastic in deep cold so it will not crack again the first hard winter — inside and out where needed, tooled clean for a neat, watertight, draft-free joint.

Caulking is quick and low-cost on its own, or easy to bundle with glass repair, screen repair or hardware repair while we are on-site. For a whole tired window, ask about energy-efficient replacement instead.

Montreal window caulking, answered

When to re-caulk, stopping drafts, and protecting the wall.

How often should window caulking be redone?

Exterior caulking typically lasts several years, but our freeze-thaw cycles and summer sun are hard on it, so it eventually shrinks, hardens and cracks away from the frame. Rather than a fixed schedule, the rule is to re-caulk when you can see gaps, cracks or sealant pulling away from the window, or when you feel a draft or find water near the frame. A quick look each spring and fall catches it early. Re-caulking when the seal first fails is far cheaper than repairing the water damage a neglected gap can cause.

Does caulking stop drafts?

Yes — a surprising amount of window draft comes not through the sash but through gaps in the frame-to-wall joint where the caulking has failed, and sealing that joint stops the air and water infiltration around the outside of the window. It works hand in hand with interior weatherstripping, which seals the moving sash: caulking seals the fixed perimeter, weatherstripping seals the part that opens. Together they close the two main paths cold air takes around a window. We can check and address both at the visit.

Can bad caulking cause damage?

Yes — this is why caulking matters beyond comfort. When the frame-to-wall seal fails, water can get behind the window frame and into the wall, where over time it rots the sill, the framing and the interior finishes, and can feed mould. That hidden damage is far more expensive to fix than the caulking that would have prevented it. Keeping the exterior joint sealed is cheap insurance for the opening and the wall around it. If water has already been getting in, we will check for damage and let you know what we find.

Interior or exterior caulking — which do I need?

Exterior caulking seals the frame to the wall against water and wind; interior beads finish and air-seal inside. We advise and do whichever your window needs.

What kind of sealant do you use?

A flexible, exterior-grade sealant rated to stay elastic in the deep cold, so it does not crack and pull away the first hard winter.

Get your Montreal window caulking quote in writing

Cracked or failing caulking around your windows? Book a visit anywhere across Montreal and the surrounding towns — we strip the old sealant and apply fresh, cold-rated caulking for a watertight, draft-free joint that protects the frame and wall. Done by our own crews, quoted up front, no subcontractors, no pressure.

Locally owned · Insured · ENERGY STAR® · Free written estimates

Real Montreal reviews

What Montreal homeowners say after we re-caulk

★★★★★ 4.9 · 118 reviews on Google

★★★★★

Old caulking had cracked and water was getting in. They stripped it, re-sealed with cold-rated caulk and the joint is watertight.

C. Deschamps

Homeowner, Montreal

Neat, tidy re-caulk inside and out. Draft around the frame is gone and no more worry about rot.

A. Virk

Homeowner, Laval

Caught a small leak before it damaged the sill. Fast, affordable and properly tooled.

R. Fournier

Homeowner, Longueuil

★★★★

Fresh flexible sealant that should hold through our winters. Clean lines, honest price.

M. Okeke

Homeowner, Gatineau

Montreal window caulking that stops water and air leaks

Fresh sealant that protects the wall

From free measure to fresh sealant in four steps

Book the estimate

On-site measure

Written quote

Install, cleanly

Watertight joints, no drafts, no rot

More Montreal window repair services

Glass Repair

Foggy Sealed Unit

Screen Repair

Hardware Repair

Montreal window caulking, answered

What Montreal homeowners say after we re-caulk

Montreal window guides

How to Choose the Right Windows for Your Montreal Home

Get your Montreal window caulking quote in writing