Both frame and sash corners are fusion-welded, creating a single, rigid unit that resists prairie wind loads and seasonal expansion better than mechanically fastened frames.
Because every corner is heat-melted into one piece, there are no screws to loosen when a –25 °C morning flips to a +10 °C Chinook. The monolithic build keeps horizontal tracks perfectly square, so your active sash won’t bind or leak after years of slamming gusts off the Rockies. Less flex also means the weather-seal stays evenly compressed, cutting drafts and preventing the hairline cracks that let spring melt seep into drywall.
Premium Black “S” Class SuperSpacer® plus full 7/8-inch insulating glass with Low-E coating and argon gas form a high-performance barrier that cuts winter heat loss and summer solar gain.
Calgary sits 1 045 m above sea level, so UV and radiant heat are intense; the Low-E layer reflects that surplus energy, keeping south-facing rooms comfortable without blackout blinds. Dense argon slows conductive heat flow when the mercury plunges, while the warm-edge spacer prevents edge-of-glass condensation—no more morning frost on window tracks. Upgrade to a 1 ⅜″ triple-pane to chase Canada Greener Homes rebates and push U-values below 1.0 W/m²·K.
A die-cast cam lock paired with a closed-back keeper reinforces the interlock point, deterring forced entry and keeping the active sash tight against drafts.
Solid-zinc construction outperforms stamped steel by up to three times in pull-force tests and shrugs off road-salt corrosion that rides every winter chinook. Each throw of the lock draws the sash snugly into the fixed jamb, boosting the compression seal and silencing the rattle typical of older slider windows. The low-profile lever tucks neatly behind blinds, preserving clean sight-lines inside and out.
Three continuous lines of weather-stripping block air and water penetration, maintaining a weather-tight seal during heavy rain or sudden Chinook gusts.
A soft inner bulb gasket cushions the sash and filters fine dust, a fin-seal in the middle scrapes away debris as the sash slides, and a rigid outer gasket diverts driving rain. The harder the wind blows, the tighter the seals press—so you stay comfortable whether it’s a July thunderstorm or a February white-out. By keeping moist indoor air away from cold glass edges, the triple seal also stops condensation puddles that can warp hardwood floors.
Deep, multi-chamber vinyl extrusions trap insulating air pockets for superior R-values, while the 3 ¼-inch frame depth fits standard Calgary wall builds without extra trim.
Each chamber acts like a built-in storm window, slowing heat transfer much the way hollow core bricks insulate a house. The added internal walls stiffen long horizontal members that sliders depend on, preventing mid-span sag so the sash glides smoothly year after year. You get a slimmer-looking profile that still meets ENERGY STAR® Zone 3 requirements and dampens low-frequency traffic noise from nearby routes like Deerfoot Trail.