
Local service
Thermos replacement on Nuns' Island
Your Nuns' Island glazier for thermos replacement: we replace only the sealed unit in your existing frame, with custom-made glass, a free assessment and transparent pricing.
Local expert
Your thermos specialist on Nuns' Island
Fog between the panes means the seal on your thermos has failed. Nuns' Island is dominated by condo towers and high-rise co-ownership buildings, many built between the 1970s and 2000s, and their sealed units are now reaching the end of their life.
The good news: there's no need to replace the whole window. We replace only the failed sealed unit in the existing frame, with custom-made glass.
Custom glass for non-standard sizes, a free assessment and transparent pricing starting at $150.

Local context
Nuns' Island: high-rise glazing, river wind and townhouses
Surrounded by the St. Lawrence, Nuns' Island has condo towers at both ends, mid-rise buildings and pockets of townhouses and semi-detached homes. In the towers, glass often takes up most of the wall, with patio doors opening onto balconies or terraces. Townhouses lean more toward casement windows, a backyard patio door and sometimes fixed transoms above the openings. Few of these units come in standard sizes.
With nothing around to break it, wind off the river hits upper-floor façades head-on. Large sealed units flex more, and once a seal tires, moisture gets in quickly. For oversized panels and patio doors, we make the thermos in tempered glass. Low-E glass with argon also helps heavily glazed condos stay comfortable, especially on the sunny side, where heat builds up in summer.
Before we come, check your building's rules with management: permitted work hours, elevator booking, corridor protection. Let us know where to park too, as many towers have limited visitor spots. The island is easy to reach from Highway 15 or from Verdun. A tip for condo owners: if neighbours also have foggy windows, it can be handy to schedule their assessments on the same day.
Areas served
- Pointe-Nord
- Pointe-Sud
- Place du Commerce
- René-Lévesque Boulevard
- Île-des-Sœurs Boulevard
Why it happens here
Nuns' Island: why your windows fog up
Window walls
Large tempered-glass units for condos where glass covers nearly the whole wall.
River wind
New, tightly sealed thermos for upper floors exposed on every side.
Building rules
Elevator, hours, corridors: we plan with your management before we arrive.
Townhouses
Casements, transoms and backyard patio doors, replaced right in the frame.
Our services
Our services in Nuns' Island
Thermos replacement
We replace the failed sealed unit inside your existing frame — no need to change the whole window.
Learn moreFoggy glass / condensation between panes
Diagnosis of permanent fogging between panes and sealed unit replacement.
Learn moreGlass & window repair
Broken or cracked glass? Fast on-site glass replacement, all sizes.
Learn moreDouble & triple glazing
Upgrade your insulation with a double or triple argon-filled sealed unit.
Learn morePatio door & French door
Sealed unit replacement for your sliding and French doors.
Learn moreCustom glass & mirrors
Custom-cut glass and mirrors for all your applications.
Learn moreCommercial glazing
Glazing solutions for shops, offices and buildings across Greater Montreal.
Learn moreNeighbouring areas
We also serve nearby areas
Simple and fast
How it works in Nuns' Island
Call or photo
Send a photo of your foggy window or call us — we'll guide you.
Diagnosis & measurement
We measure your sealed unit and confirm the diagnosis, free of charge.
Custom fabrication
Your sealed unit is custom-made and ready within 24 to 72 hours.
Guaranteed installation
Clean installation with a written warranty included.
FAQ
Questions about Nuns' Island
Do you serve Nuns' Island?
Yes, we work everywhere on Nuns' Island, from the Pointe-Nord towers to the residential areas. The assessment and travel are free.
How long does it take on Nuns' Island?
The assessment is done quickly on site, then your thermos is custom-made within 24 to 72 hours.
Do you replace thermos units in houses?
Yes, we cut custom glass to the exact dimensions of your windows and install it in the existing frame.
My Nuns' Island condo is on a high floor. How does the replacement work?
During the free assessment, we inspect the unit and confirm how it can be removed and installed in your existing frame. We then set a date with you and building management, working around elevator rules and permitted work hours.
Is Low-E worth it in a heavily glazed Nuns' Island condo?
Often, yes. When windows cover much of the wall, Low-E glass with argon cuts the heat coming in during summer and the heat escaping in winter. We'll talk it through during the visit based on which way your unit faces.

Ready for clear windows again?
Free quote, honest diagnosis and transparent pricing. Call us or request your quote now.
Request your free quote
Fast response, no obligation. The diagnosis is always free.