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Triple Pane Passive House Windows

U-factor ≤ 0.14, warm-edge spacers, fiberglass or wood-clad frames — the energy-and-health workhorse of every Passive House.

Triple Pane Passive House Windows — a natural material we specify on every Earth Bound Homes project

Toxicity Screening — All Clear

This material screens clear across all seven independent toxicology authorities we use on every project.

LBC Red List

Not Listed

Prop 65

Not Listed

IARC

Not Listed

NTP RoC

Not Listed

GSPI

Not Listed

REACH SVHC

Not Listed

TSCA

Not Listed

Material Type

High-Performance Triple-Glazed Window Assembly

Material Description

Passive-House-grade windows combine three things you don't get in conventional windows: three lites of glass with two low-e coatings and argon or krypton fill (U-factor down to 0.10-0.14), warm-edge spacers that eliminate the cold-edge condensation seen in aluminum-spacer windows, and a thermally-broken frame in fiberglass, wood-clad, or PHI-certified aluminum-thermal-break. The result is a window that performs essentially as well as the surrounding wall — interior glass surface stays close to room temperature even at -10°F outside, eliminating cold drafts and condensation that drive mold. EBH avoids uPVC (vinyl) frames — that's an entire chemistry family on the Avoid list — and specifies fiberglass or wood-clad-aluminum frames.

Composition & Origin

Three glass lites + two low-e coatings + argon/krypton fill + warm-edge spacer + fiberglass or wood-clad frame · U-factor ≤ 0.14

Health Profile — All Endpoints Clear

Severity scored 0–10 against the same 10 hazard endpoints we use for the chemical families on the avoid list. Every score is 1–2 — essentially no signal across every endpoint.

Cancer

1/10

Endocrine

1/10

Reproductive

1/10

Developmental

1/10

Neurological

1/10

Respiratory

1/10

Cardiovascular

1/10

Liver/Kidney

1/10

Skin

1/10

Immune

1/10

Common Forms & Brands

Alpen High Performance Series 525 / 725
Zola European Hybrid
Pinnacle PHC certified passive-house windows
Common framing: fiberglass triple-pane, wood-clad triple-pane, thermally-broken aluminum (PHI-certified)

Why We Use It

Interior glass surface stays warm — no condensation, no cold drafts
Solar-heat-gain coefficient tunable per orientation
Acoustic performance dramatically better than dual-pane
No off-gassing — glass, metal, and fiberglass-resin frame (not uPVC)
30-50 year service life with proper installation

Where It Performs Best

All exterior windows in new construction and deep retrofits
Passive House and net-zero residential projects
Curtain wall installations in cold climates
Skylight units (where triple-glazed available)

Building Applications for Triple Pane Passive House Windows

Listed alphabetically. Where in a home this material earns its keep.

Curtain Wall Glazing
Fixed & Operable Windows
French Doors & Patio Doors
Skylights & Roof Glazing
Sliding Door Assemblies

Specifying a project? Drop the manufacturer's SDS into our SDS Toxic Chemical Screener to verify any specific product you're considering screens clear on all seven databases.