Glass Authority
Window Glass Options — The Trust Build Ontario Guide
Every Trust Build window package starts with the glass. Compare pane counts, Low-E coatings, tempered and laminated security glass, impact-resistant assemblies, Security Window Film and Privacy Film — and learn which combination is right for each room of your home.
Pane Configurations
Double pane vs. triple pane insulated glass units (IGUs)
An insulated glass unit — IGU — is the engineered assembly of two or three glass panes sealed around a gas-filled cavity. The pane count is the single biggest decision driving thermal performance, comfort and condensation behaviour in Ontario's freeze-thaw climate.
Double Pane Glass
Two glass panes sealed around a single argon-filled cavity. The Ontario baseline — meets Energy Star minimums when paired with Low-E and a warm-edge spacer. Best for secondary openings, garages, sheds and tight-budget basement projects.
Triple Pane Glass
Three glass panes and two gas-filled cavities. Roughly 30% better thermal performance than double-pane, dramatically warmer inner-pane surface temperatures in winter (so far less condensation), and 4-6 STC quieter. Standard on most Trust Build window installs.
See It in Cross-Section
What double-pane and triple-pane actually look like inside the frame
Double-Pane IGU
2 panes · 1 argon-filled cavity
Triple-Pane IGU
3 panes · 2 argon-filled cavities
Low-E Coatings
Low-E 180, Low-E 272 and Low-E 366 — what's actually different
Low-emissivity (Low-E) coatings are microscopically thin metallic layers applied to one or more glass surfaces inside the IG unit. The three Cardinal Low-E options have different solar heat gain coefficients (SHGC) — which translates directly to how much winter sun warms your room and how much summer sun overheats it.
Low-E 180
Highest solar heat gain (SHGC ~ 0.69). Designed for north and east exposures where you want to capture passive winter warmth. Highest visible light transmission of the three Low-E options.
Low-E 272
Balanced solar control (SHGC ~ 0.40). The all-rounder we recommend for most Ontario homes — appropriate on east, west and mixed exposures. Energy Star compliant in every Canadian climate zone.
Low-E 366
Maximum solar control (SHGC ~ 0.27). Blocks ~95% of UV. Best for south- and west-facing rooms that overheat in summer or where furniture fading is a concern. Slightly cooler-toned glass appearance.
i89 Indoor-Facing Low-E
A second Low-E layer applied to the room-side glass surface. Reduces winter heat loss further by reflecting interior radiant heat back into the room. Pairs with any of the three exterior Low-E options for triple-Low-E performance.
Safety & Security Glass
Tempered, laminated security and impact-resistant glass
Tempered, laminated and impact-resistant glass each solve a different residential problem. Tempered is about breakage safety — required by Ontario code in dozens of common locations. Laminated is about forced-entry resistance, UV blockage and noise reduction. Impact-resistant is the heavy-duty assembly for storm debris and sustained attack resistance. Trust Build specifies each one where it actually belongs — not as a blanket upsell.
Tempered Glass
Heat-treated to roughly 4× the strength of standard annealed glass. When it does break, it crumbles into pebble-sized pieces instead of long shards. Required by Ontario building code in bathrooms, within 18" of a finished floor, within 24" of a door edge, and at any height above ground level on sloped applications.
Laminated Security Glass
Two panes of glass bonded with a clear polyvinyl butyral (PVB) interlayer. When struck, the glass cracks but stays bonded to the interlayer — slowing forced entry by minutes, reducing injury risk, blocking ~99% of UV, and adding 4-8 STC of noise reduction. The most common security-glass upgrade we install.
Impact Resistant Glass
Heavy-duty laminated assemblies engineered to withstand storm debris and sustained forced-entry attack. Multiple PVB interlayers and thicker glass plies — typically rated to P4A European glazing standards or equivalent. The highest tier of security glass we install on residential projects.
Window Films
Security Window Film, Privacy Film and UV Film
Window films are professionally installed on the interior surface of existing glass. They're the right answer when you want the performance of laminated, tempered or privacy glass without replacing the window itself. Trust Build installs film as a complement to our window and door work — and as a service in its own right at /services/security-film/.
14-mil Security Window Film
Trust Build's primary security film offering. A heavy-duty 14-mil multi-layer polyester film applied to the interior surface of existing glass. Designed to increase forced-entry resistance, help keep broken glass bonded together during impact, and protect families from shattered glass on entry doors, sidelites, patio doors and basement windows. Optically clear, professionally installed.
Privacy Window Film
Frosted, decorative or one-way reflective films applied to bathrooms, front-door sidelites, office partitions and ground-floor side windows. Lets daylight through, blocks the view, and is removable without damage.
UV Protection Film
Blocks 99% of UVA and UVB. Protects hardwood floors, artwork, leather furniture and millwork from fading. Pairs naturally with security and privacy film options.
Anti-Shatter / Safety Film
Code-rated safety film for glass that doesn't currently meet tempered or laminated requirements — common in older schools, commercial buildings and heritage homes.
Privacy & Decorative
Obscure, frosted and sandblasted glass options
Privacy and decorative glass are factory finishes that travel with the IG unit for the life of the window. For existing windows, Privacy Window Film achieves nearly identical results without removing the glass.
Privacy Glass
Factory-patterned obscured glass — rain, narrow reed, glue chip, satin. Lets light in, keeps eyes out. Standard option on bathroom, basement and side-yard windows.
Frosted Glass
Acid-etched uniform frosting for a clean, modern look. Light passes through; shapes do not. Available on doors, sidelites and any operable window.
Sandblasted Glass
Custom decorative patterns blasted into the glass surface — for entry-door sidelites, feature windows and signage panels.
Glass Technology
What's between (and around) the panes matters
The pane-to-pane technology — gas fill, spacer, manufacturer — affects performance as much as the visible glass surfaces. Trust Build specifies argon, Super Spacer warm-edge technology and Cardinal IG units across the line.
Argon Gas Fill
Inert gas that fills the cavities between panes. About 1.4× denser than air, it slows convective and conductive heat transfer and improves the unit's U-value by roughly 15%. Standard on every Trust Build IG unit.
Super Spacer (Warm-Edge)
All-foam structural spacer that replaces the conventional aluminium spacer between panes. Eliminates the cold conductive bridge at the glass perimeter — dramatically reducing perimeter condensation in winter and extending IG seal life.
Cardinal IG Glass
Trust Build installs Cardinal insulated-glass packages — North America's most-trusted IG manufacturer. Every unit is backed by Cardinal's 20-year sealed-unit warranty against fogging and seal failure.
Performance Comparison
How the glass packages stack up
| Package | U-Factor | Energy Star | Best For |
|---|---|---|---|
| Double pane + Low-E 272 + argon | 0.27 | Zone 1 & 2 | Budget replacements, secondary openings |
| Triple pane + Low-E 272 + argon | 0.20 | All zones | Most Ontario homes — best overall value |
| Triple pane + Low-E 366 + i89 + argon | 0.17 | All zones | South-facing rooms, sun-heavy exposures |
| Triple pane + laminated inner + Low-E 272 | 0.21 | All zones | Ground-floor, patio doors, egress openings |
| Triple pane + laminated + acoustic interlayer | 0.21 | All zones | Homes on busy roads, near schools or transit |
| Triple pane impact-resistant (P4A) | 0.22 | All zones | Rural homes, custom builds, high-security tier |
Indicative U-factors based on Cardinal IG published data. Actual values depend on frame, gas-fill retention and final assembly.
Choosing Your Package
Which glass package is best for your home?
Most Ontario homes need three or four different glass packages distributed across the house — not one spec applied to everything. Here's how Trust Build thinks about it room by room.
Cold-weather priority (north/east windows)
Triple pane + Low-E 272 + i89 + argon. Maximum thermal performance for Ontario winters. Inner-pane surface stays warm enough to prevent perimeter condensation even at -25 °C.
Sun-heavy south & west rooms
Triple pane + Low-E 366 + argon. Blocks the highest percentage of solar heat gain and ~95% of UV — protects flooring and furniture, keeps the room comfortable in July.
Busy-road noise reduction
Triple pane + laminated outer pane (or laminated acoustic). Adds 6-8 STC of noise reduction — voices and traffic drop noticeably inside the room.
Ground-floor & basement security
Triple pane + laminated inner pane (P2A). The most cost-effective forced-entry-resistant assembly we install. Pairs with multi-point hardware for total perimeter security.
Patio doors & egress windows
Triple pane + laminated inner + tempered. Code-compliant safety glass plus break-and-reach resistance — the most common forced-entry path on Ontario homes is finally closed.
Existing windows you're not replacing yet
14-mil Security Window Film. Heavy-duty multi-layer security film applied to the interior surface — increases forced-entry resistance, helps keep broken glass bonded together, and protects families from shattered glass without replacing the window. Most homes installed in one day.
Download
Impact Glass Security Solutions Brochure
Review our security glass comparison guide to understand the difference between standard glass, laminated security glass, and impact security glass.
Compare standard, laminated security & impact glass
A side-by-side reference covering forced-entry resistance, breakage behaviour, and enhanced protection across our security glass solutions.
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Every Trust Build quote includes glass-package recommendations for each opening. No upcharges for picking the right Low-E, tempered or laminated.
- Cardinal IG glass on every package
- Triple-pane standard on most windows
- Low-E, tempered and privacy options at no extra cost on most styles
- Security Window Film service available for existing windows
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