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Types of window glass: Options for energy efficiency, comfort & performance
The type of glass that fills your window or patio door frames plays an important role in protecting your home from weather, aids in your home's energy efficiency, and can add style to your home. There is a type of glass for nearly every climate, location, and situation. Learn the differences between types of glass and the available options.
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Common window glass terms
Annealed glass (aka standard glass) is slowly cooled to make glass more durable and less likely to break.
Tempered glass is glass that goes through a heating or chemical process to increase its strength. When shattered, tempered glass breaks into small, dull pieces. Windows and doors near walkways often must use tempered glass to meet building code for safety purposes.
Laminated glass is a type of safety glass that holds together if shattered. A clear, thin polymer interlayer holds the glass together.
Decorative glass is glass that has patterns or designs. Decorative glass designs help obscure views in and out of the glass to create privacy for spaces like bathrooms. Decorative glass can also refer to tinted glass.
Tinted glass is a type of decorative glass that has a thin, slightly colored layer between the glass panes. Tinted glass is popular in climates that experience long periods of direct sunlight. Tinted glass has tinted interlayers to make the glass tinted.
Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC) glass are designed to reduce sound going through the glass. STC/OITC glass has additional thickness to dull outdoor noise.
Double glazed is another way of referring to double paned windows. Double glazed or double-pane windows often include an inert gas between the panes to help with energy efficiency. Double-pane windows are the most common type of window.
Safety glass refers to glass designed to resist shattering into jagged edges. This reinforced glass is commonly found in doors, skylights, and windows. Tempered glass and laminated glass get called safety glass because they don’t break into sharp pieces like annealed (standard) glass.
Insulated glass has two or three glass panes separated by a spacer bar. An inert gas like argon usually fills the space to provide insulation between the panes. The inert gas can help with a window’s U-factor and solar heat gain coefficient (SHGC).
Infinity glass types
Insulated glass
Tempered glass
- Fixed or operable window glass larger than 9 square feet
- Areas within 24 inches of a doorway
- Windows with the bottom sill less than 60 inches above the floor
- Windows within 36 inches of where people walk
Laminated glass
Energy Efficiency
How glass impacts home energy efficiency
Low E1 glass glazing works best in colder climates because it allows more heat in to warm a room while blocking heat loss.
Low E2 glass glazing reflects heat in the summer and retains heat during the winter, making an ideal choice for moderate climates. Our Low E2 blocks 84% of the sun’s UV rays to reduce color fading.
Low E3 glass glazing works to reject solar heat while still allowing light to enter. It's a great option in climates that experience intense sunlight. Low E3 glass will block up to 95% of UV rays.
Low ERS provides maximum efficiency year-round in all conditions. It features an additional room-side metallic coating.
Tempered vs. Low-E glass
Frequently asked questions
Most consider tempered glass the strongest type of glass, but several combinations of tempered glass exist that can provide similar strength. Tempered glass appears in impact-resistant glass, hurricane glass, and laminated glass, too.
The safety properties of tempered glass make it a good choice and often a requirement in certain areas of a home. Laminated glass can provide additional safety because an interlayer can hold broken glass in place. Tempered and laminated glass can also have tint and metallic coatings best suited for your climate to make it the best window glass for your climate.
Choosing the best window glass for your home can come down to where you’re replacing windows and the type of window or patio door you’re replacing. Tempered glass is the best window glass in certain areas because of safety considerations and is required in specific places.
Tempered and laminated glass are considered the toughest glass for windows. Both have additional strength, compared to annealed glass. Laminated glass differs from tempered glass because it has a clear, thin polymer interlayer that holds the glass together if broken.