Canadian-Made Fiberglass Windows in Ontario
SILEX fiberglass windows are manufactured in Canada and available across Ontario through WD Craftline, our official Ontario partner.
Engineering Fiberglass Excellence
Fiberglass Windows Engineered in Canada
Thermal Efficiency in Extreme Cold
Our fiberglass windows are built to perform in Ontario’s extreme weather, from freezing winters to hot, humid summers. Strong, stable frames deliver lasting performance through changing temperatures and harsh Canadian conditions.
Built for Ontario Homes and Buildings
Ontario properties face changing temperatures, strong sunlight, moisture, wind, and seasonal weather. SILEX fiberglass windows provide a durable, low-maintenance solution for homes and buildings throughout the province.
Manufactured in Canada
At SILEX, we manufacture Canadian-made fiberglass windows built for demanding climates and available across North America. Our strong, stable frames resist warping and deliver lasting performance through every season.
Built for Ontario Homes and Buildings
Why SILEX Fiberglass?
At SILEX, we manufacture fiberglass windows for the demands of residential and commercial projects across Ontario. From custom homes and cottages to multi-residential developments and commercial buildings, our window systems combine strength, energy efficiency, design flexibility, and lasting performance.
Your Partner in Exceptional Windows & Doors
We offer comprehensive support, including mock-up testing, field reviews, and compliance monitoring to ensure high-quality installation.
SELECTING A FRAME MATERIAL
Fiberglass, Vinyl and Aluminum Windows
Different window-frame materials offer different cost, design and performance characteristics. In extreme Canadian climates, choosing the right material is critical to ensuring your home stays highly insulated, structurally sound, and free from thermal deformation.
Fiberglass (Silex)
The premium architectural standard built for structural endurance.
Dimensional Stability
Outstanding. Thermal expansion matches glass perfectly, preventing seal failure in extreme cold.
Thermal Conductivity
Superior. Naturally insulating composite material requires no thermal break to block cold air transfer.
Large Openings
Ideal. Exceptional structural load capacity allows for ultra-slim profile designs and massive glass panes.
Moisture & Rot Resistance
100% Impervious. Completely immune to rot, rust, corrosion, and extreme Saskatchewan moisture cycles.
Maintenance
Virtually Zero. Never warps, peels, or fades. Built to last for multiple generations without structural degradation.
Standard Vinyl
A common, budget-conscious choice for standard subdivisions.
Dimensional Stability
Moderate. High rate of thermal movement causes expansion and contraction that stresses seals.
Thermal Conductivity
Good. Multi-chambered vinyl profiles trap air efficiently, though chamber walls are thin.
Large Openings
Limited. Lacks natural stiffness; requires thick framing profiles or internal steel reinforcing sleeves.
Moisture & Rot Resistance
Impervious. Will not rot or rust, but can become brittle and warp under extreme UV and heat.
Maintenance
Low. Does not require painting or refinishing, though structural sagging cannot be repaired.
Aluminum
A structural material commonly used in commercial storefronts.
Dimensional Stability
High structural stability, but subject to rapid expansion cycles in direct high-heat sunlight.
Thermal Conductivity
Poor. Highly conductive metal transfers heat/cold instantly, requiring expensive thermal breaks.
Large Openings
Excellent. Exceptional tensile strength allows for massive commercial glass panels.
Moisture & Rot Resistance
Impervious. Completely resistant to rot, but vulnerable to oxidation and surface pitting over time.
Maintenance
Low to Moderate. Requires periodic inspection of thermal break integrity and drainage weep holes.
Looking for quality windows and doors for your next project? Contact WD Craftline today to explore Windsor Windows & Doors products and professional installation across Toronto and the GTA.