ARCHITECTURAL
CASEMENT WINDOWS.
Engineered for British Columbia’s changing coastal and mountain climate. Maximum airtight compression sealing, panoramic natural light, and effortless 90-degree ventilation.
BUILT FOR COMFORT.
CRAFTED FOR LONGEVITY.
Unlike sliding windows that rely on brush seals, MJM casement windows close with a continuous mechanical compression gasket that locks out Pacific Northwest rain, driving wind, and city noise.
Multi-Point Compression
Concealed dual and triple cam locks pull the sash tightly against Santoprene rubber weatherstrips along the entire perimeter with a single lever action.
90° Clean-from-Inside
Sashes open past 90 degrees on heavy-duty stainless track hinges, letting you safely clean both exterior and interior glass surfaces directly from inside your room.
Superior Thermal Break
Fusion-welded multi-chamber uPVC extrusion traps insulating dead air inside the frame, achieving an exceptional U-Factor of 0.18 with triple glazing.
Truth Hardware™ Quality
Fitted with commercial-grade Truth Encore™ operators and folding nesting handles that never interfere with window blinds or custom drapery.
PRECISION IN EVERY CUT AND SEAL.
Every MJM casement window is precision-manufactured at our Surrey facility using 100% virgin uPVC compound and robotic fusion welding.
3 1/4" Multi-Chamber Fusion-Welded Frame
Engineered with independent internal air pockets that block heat transfer and create structural rigidity without thermal expansion warping.
Dual-Point Continuous Santoprene Gasket
Resists drying, cracking, and hardening under BC freezing temperatures and coastal UV exposure, ensuring airtight seal integrity for decades.
High-Performance Sealed Glass Unit
Equipped with Super Spacer® warm-edge technology, Low-E soft coating, and 90% Argon gas filling to stop winter condensation.
Full Perimeter Internal Steel Reinforcement
Strategic galvanized steel reinforcing bars placed inside hinge mounting channels ensure large architectural sashes never sag.
TESTED AND CERTIFIED
ARCHITECTURAL DATA.
Third-party tested according to NAFS (North American Fenestration Standard) and CSA A440 standards for Canadian residential and commercial building codes.
| PERFORMANCE CHARACTERISTIC | TEST STANDARD | MJM DOUBLE GLAZED | MJM TRIPLE GLAZED |
|---|---|---|---|
| Thermal Transmittance (U-Factor) | NFRC 100 / CSA A440.2 | 0.25 W/m²·K (US 0.24) | 0.18 W/m²·K (US 0.17) |
| Energy Rating (ER) | CSA A440.2 | 34 (Energy Star Zone 1 & 2) | 42 (Most Efficient 2026) |
| Air Infiltration Resistance | ASTM E283 / NAFS | Level A3 (< 0.01 L/s·m²) | Level A3 (< 0.01 L/s·m²) |
| Water Penetration Resistance | ASTM E547 / NAFS | 730 Pa (15.24 psf) | 730 Pa (15.24 psf) |
| Structural Performance Grade | AAMA/WMA/CSA 101/I.S.2 | CW-PG50 (Commercial) | CW-PG60 (High Exposure) |
| Sound Transmission Class (STC) | ASTM E90 / E413 | STC 31 (Standard) | STC 36 (Acoustic Laminate) |
| Hardware Cycle Durability | AAMA 901 | 10,000+ Full Open/Close Cycles | 10,000+ Full Open/Close Cycles |
FREQUENTLY ASKED
QUESTIONS.
Have questions about casement window installation, pricing, or operation? Here are straight answers from our Surrey manufacturing team.
Casement windows are significantly more airtight and energy-efficient than horizontal or vertical sliding windows. Sliding windows require weatherstripping that allows movement, which creates micro-drafts over time. Casements close with mechanical compression against Santoprene rubber gaskets—the harder the wind blows against the sash, the tighter the seal becomes.
Yes, depending on the specific hinge and opening configuration selected. Casement sashes equipped with 90-degree egress hinges slide outward along the track when opened, creating a generous gap at the hinge side so both interior and exterior glass surfaces can be safely reached from inside your home.
Absolutely. Casement windows perform exceptionally well in exposed coastal environments. Because the sash presses tighter into the multi-point compression weatherstripping as wind pressure increases, they resist driving Pacific rain and high wind loads when paired with the appropriate glass package and frame profile.
MJM casement windows are available in a variety of classic and modern interior/exterior frame colors, along with commercial-grade Truth Encore™ hardware finishes. Custom color matching and specialized handle finishes can be selected during your design consultation.
Timelines depend on the total scope of your project, custom manufacturing requirements, and site conditions. Precise on-site measurements are scheduled first, followed by custom fabrication in our Surrey facility. Professional installation for standard residential orders is typically completed in 1 to 3 days.
DON’T LET A FAILING WINDOW COST YOU ANOTHER WINTER.
Schedule your free on-site measure today. Fixed quotes, Surrey in-house manufacturing, licensed installers, and zero change orders.