Oversized & Heavy Window and Door Installation
Precision installation for large-format, high-performance fenestration
Today’s modern architecture favors expansive glazing, floor-to-ceiling windows, and grand, panoramic doors that blur the line between indoors and out. But with size comes complexity. Oversized windows and doors — especially those that are triple-glazed, multi-paneled, or energy-rated for extreme climates — demand more than brute strength. They require specialized knowledge, careful coordination, and the right tools to achieve flawless, high-performance results.
At Fentec, we are among the first in Quebec to specialize in oversized unit installation. From triple-glazed curtain walls to oversized lift-and-slide doors, we’ve installed some of the heaviest and most complex residential units on the market — consistently and cleanly.
What Makes Oversized Units So Demanding?
Large-format windows and doors offer unparalleled natural light and aesthetics, but they introduce unique technical challenges:
- Weight: Triple-glazed panels can exceed 300–500 lbs, requiring lifting equipment and reinforced anchoring strategies.
- Thermal bridging risks: The larger the unit, the greater the surface area for potential energy loss if not sealed correctly.
- Movement and deflection: Longer spans are prone to bowing or warping, demanding expert handling during transport and install.
- Precision tolerances: Even small shifts during installation can compromise operation or airtightness.
Our Oversized Unit Installation Process
Fentec brings the specialized workflow, equipment, and onsite coordination these projects require:
- Mobil Cranes & Specialized Handling Gear
We arrive prepared with large-format mobile cranes, lifting suction systems, and custom jigs that allow us to safely maneuver and install oversized glass without damage or delays — even in tight urban job sites.
- Site Evaluation & Structural Inspection
Before any glass touches the site, we assess opening dimensions, header support, and floor load ratings. Oversized units need perfect levelness, solid anchoring, and enough tolerance for expansion and contraction.
- Advanced Shimming, Leveling & Anchoring
Our crew understands how to distribute weight, maintain frame rigidity, and apply non-compressive insulation that supports thermal performance without distortion.
- Air & Water Management
Large units often span multiple framing members or wall systems. We ensure continuous air and water barriers, including integration with drainage planes, tapes, and membranes, to prevent moisture infiltration over time.
- Clean Finish, No Compromise
From delicate interior trims to custom aluminum flashings, we finish oversized installs with the same care and detail as standard-sized units — no shortcuts, no excuses.
Energy Efficiency Meets Architectural Freedom
As homes become more efficient and design-forward, oversized triple-glazed windows are becoming the new standard — combining form and function. The key lies in the execution.
Whether you’re pursuing Passive House-level efficiency or simply want to fill your space with natural light, large-format units must be installed by professionals who understand the physics, the logistics, and the risks. We do.
Why Builders and Manufacturers Trust Fentec
- One of Quebec’s earliest adopters of oversized window and door installation
- Deep experience with triple-glazed, tilt-and-turn, lift-and-slide, pivot, and custom curtain wall units
- Fully equipped with site-ready tools and mobile handling equipment
- Trusted by high-end manufacturers to represent their product on-site
- Serving Montreal, Laval, North Shore, Laurentians and beyond
Built for Today’s Architecture
Bigger isn’t just better — it’s smarter when installed correctly. Fentec ensures your oversized windows and doors are perfectly aligned, sealed, and set for performance.