Double-Pane IGU
Two panes and one sealed cavity for standard energy performance.
Insulated glass units are sealed multi-pane assemblies that improve thermal comfort, condensation resistance, and sound control compared with single glazing. Performance depends on pane count, low-e coating, gas fill, spacer conductivity, seal durability, glass thickness, and total unit thickness. IGUs must be matched to the frame system that will carry and drain them.
Configurations
How It Comes
Applications
Where It's Used
Residential Windows
Insulated Glass Unit products are commonly selected for residential windows where the product configuration, performance rating, and installation condition fit the project.
Commercial Punched Openings
Insulated Glass Unit products are commonly selected for commercial punched openings where the product configuration, performance rating, and installation condition fit the project.
High-Performance Envelopes
Insulated Glass Unit products are commonly selected for high-performance envelopes where the product configuration, performance rating, and installation condition fit the project.
Replacement Sash And Glass Service
Insulated Glass Unit products are commonly selected for replacement sash and glass service where the product configuration, performance rating, and installation condition fit the project.
Selection Guide
How To Specify It
Use these checkpoints when comparing quotes, reviewing submittals, or deciding whether this product type fits the opening.
Glass Makeup
Annealed / Heat-Strengthened Glass Insulated Glass Unit
Base glass plies provide optical clarity and can be heat-strengthened where additional strength is needed without full tempering.
Advantages
- Clear baseline option
- Flexible in IGU makeups
- Cost-effective
Considerations
- Not safety glazing unless treated or laminated
- Breakage behavior varies
- Thermal stress must be reviewed
Glass Makeup
Tempered Safety Glass Insulated Glass Unit
Tempered glass is heat-treated for strength and safety breakage behavior in code-defined hazardous locations.
Advantages
- Required for many safety locations
- Higher strength than annealed
- Small-fragment breakage
Considerations
- Cannot be cut after tempering
- Spontaneous breakage risk is low but real
- No post-breakage retention by itself
Glass Makeup
Laminated Glass Insulated Glass Unit
Laminated glass uses an interlayer to retain broken glass and improve safety, impact, security, or acoustic performance.
Advantages
- Post-breakage retention
- Acoustic benefits
- Impact and security options
Considerations
- Higher cost and weight
- Edge protection matters
- Interlayer selection is performance-specific
Glass Makeup
Coated / Low-E Glass Insulated Glass Unit
Coated glass controls radiant heat transfer, solar gain, glare, and appearance in insulated glass units.
Advantages
- Improves energy performance
- Climate-specific options
- Can reduce fading and glare
Considerations
- Appearance varies
- Surface location matters
- Wrong SHGC can hurt comfort
Glass Makeup
Spacer and Seal System Insulated Glass Unit
The spacer and seal hold IGU panes apart, retain gas fill, and influence edge condensation and long-term durability.
Advantages
- Warm-edge options improve comfort
- Critical to IGU service life
- Supports gas-filled cavities
Considerations
- Seal failure causes fogging
- Cheap spacers increase edge heat loss
- Compatibility with frame drainage matters
Performance & Ratings
At a Glance
Project Coordination
Details To Confirm Early
01
Confirm code-required safety glass
Doors, sidelites, low glass, bathrooms, stairs, and overhead conditions often require tempered or laminated safety glazing.
02
Coordinate glass with frame capacity
Thicker, laminated, or triple-pane units add weight and thickness that must fit the sash, stops, setting blocks, and hardware.
03
Review orientation and comfort
U-factor, SHGC, visible transmittance, glare, and interior surface temperature should match climate and exposure.
Product Questions
Common Questions
What should I compare first when selecting insulated glass unit?
Start with the operation or glass makeup, then verify performance ratings, installation conditions, accessory compatibility, and warranty limits for the exact product series.
Can insulated glass unit be used in any opening?
No. Size, exposure, code requirements, frame capacity, hardware, and installation details determine whether a product is appropriate for a specific opening.
What documents should I ask for before ordering?
Request product data, installation instructions, warranty terms, available test reports, and shop drawings for custom sizes, large assemblies, or code-sensitive conditions.
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