U-0.15 performance. Made in Colorado. The Alpen Aspekt+ Builder is a simplified triple-pane window exclusively for builders in Minnesota, Illinois, and Colorado. One glass. One color. Four configs. Done.
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SpecLinkWhether you build in Minneapolis, Chicago, or Denver, codes are moving fast. Aspekt+ Builder exceeds every current and incoming requirement.
Minnesota is adopting the 2024 IECC, tightening window U-factor limits to 0.27. State statute requires a 70% reduction in new construction energy usage by 2038 vs. the 2006 baseline — roughly 10% more efficient every 3 years for the next dozen years. Aspekt+ Builder is already ahead.
Illinois adopted the 2024 IECC (effective Nov 2025), setting the Climate Zone 5A U-factor at 0.28 for most of the state. The next IECC cycle is expected to tighten to U-0.27. The state’s Stretch Energy Code already requires U-0.22 for high-performance windows.
HB23-1161 requires every window sold in Colorado to meet U-0.30 as of Jan 1, 2026, enforced at the distributor level. The Model Low-Energy Code (July 2026) tightens further.
The Alpen Aspekt+ Builder is built on the proven Aspekt+ commercial platform and simplified for builders. One color (white). One glass. Four configurations.
Up to 42"W × 84"H
Up to 42"W × 80"H
Up to 96"W × 96"H
Factory-mulled
AlpenGlass Thin Triple-Pane IGU: Roughly ⅔ the weight of conventional triple-pane.
Proprietary fiber-reinforced composite frame: Multi-chambered, fusion-welded corners. Best-in-class insulating properties, airtightness, and long service life.
Fits standard rough openings: Integrated nail fin for familiar North American installation. Installs like the windows builder crews already know.
Premium hardware: Multi-point locking, twin compression seals. Up to CW-PG70 structural.
NAMI/IGCC certified for all altitudes and climates (ASTM E2190). Proven from MN plains to CO peaks.
High STC and OITC ratings. Quiet sells itself.
Built for High Performance: NFRC whole-window ratings up to R-6.7 (U-0.15) for maximum energy savings and comfort.
Lower HERS scores: Supports lower Home Energy Rating System (HERS) Index scores and easier code compliance.
| U-Factor | 0.15 whole-window* |
| Glass | AlpenGlass Thin Triple-Pane |
| SHGC | ~0.35 |
| R-Value | R-6+ whole-window |
| Frame | Fiber-reinforced composite |
| Finish | White (int. & ext.) |
| Install | Integrated nail fin |
| Hardware | Premium multi-point locking |
| Sound | High STC and OITC ratings |
| Warranty | 20-year manufacturer |
| Lead Time | 4–6 weeks custom |
| Made In | Louisville, CO USA |
*NFRC certification pending. Performance validated against certified Aspekt+ platform.
Traditional triple-pane is heavy, thick, and expensive. Alpen Thin Glass changes that. Each thin pane is ~6x lighter than a conventional glass pane, which translates to an overall IGU that’s roughly a third lighter than a standard triple. That’s a meaningful difference on every opening your crew handles. The glass itself is built to last: with a 3x lower coefficient of thermal expansion than conventional soda-lime glass, Alpen’s thin glass naturally resists thermal stress for long-term durability.
Deliver Passive House performance in a builder-grade package with no specialty framing and no extra labor. The lighter unit means faster installs and less crew fatigue on every opening.
ASHRAE Standard 55 defines thermal comfort not by air temperature alone, but by Mean Radiant Temperature (MRT) — the average temperature of all surfaces surrounding a person, including windows. Cold glass pulls heat from your body and creates discomfort zones that no furnace can fix.
On a 0°F Minnesota winter night, standard double-pane interior glass drops to the mid-50s. ASHRAE research shows occupants feel a 5–8°F effective temperature drop within 4 feet of cold glass. That’s a cold zone stretching halfway across the room.
Aspekt+ Builder’s thin triple-pane IGU keeps interior glass within a few degrees of room temperature. The cold zone disappears. Every seat in the room is comfortable — even right next to the window.
High-performance windows aren’t a cost; they’re a value story. Here’s what Aspekt+ Builder gives your homeowners compared to standard double-pane.
Through windows vs. code-minimum double-pane. That’s real money back in the homeowner’s pocket every month.
Better windows mean lower heating and cooling loads. Your mechanicals team can spec smaller, less expensive equipment.
Buyers near highways, airports, and busy streets notice immediately. Quiet is a feature that sells itself.
Interior glass stays well above dew point, virtually eliminating condensation. No foggy windows, no mold risk, no warranty headaches.
The upgrade that doesn’t cost like an upgrade. Aspekt+ Builder delivers comparable thermal performance to custom high-performance windows at a price that protects your margin.
| European Import | Alpen Tyrol | Alpen Aspekt+ Builder | |
| U-Factor | ~0.12–0.20 | U-0.09–0.12 | 0.15 |
| Glass Options | Triple & quad, many configs | Triple & quad, full range | 1 glass (Balanced Triple) |
| Colors | Full palette | Full palette | White only |
| Lead Time | 12–20+ weeks | 6–8 weeks | 4–6 weeks |
| Origin | European import | Made in Colorado | Made in Colorado |
| Operation | Inswing tilt & turn (unfamiliar to NA homeowners) | Inswing tilt & turn | Outswing crank casement — the style NA homeowners already know |
| Price | $$$$ | $$$ | $$ |
Aspekt+ Builder is the same Aspekt+ platform as Tyrol — simplified to one color, one glass, four configs — at builder-grade pricing. European-class opening sizes with a familiar North American outswing crank casement. Actual pricing varies by configuration and volume.
Get the extra-large openings you expect from a European high-performance window, sizes that exceed what typical North American vinyl products can deliver, in the familiar outswing crank casement your homeowners already know.
U-0.15 exceeds current and incoming codes in all three markets. Built in Louisville, CO. No tariffs, no container delays. 4–6 week lead times.
Thin triple means lighter sashes. Less fatigue for your crew. Faster install per opening — and the same nail fin installation your crews already use.
Available exclusively to builders and trade professionals.
Nothing beats seeing and feeling the window in person. Visit our partner showrooms to see Aspekt+ Builder units, feel the hardware, and talk to someone who knows your market.
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