Benefits of Glass Block Windows

• Energy efficiency: Thick glass block windows offer about as much insulation and thermal protection as double-pane windows and are more energy-efficient than single-pane windows. 
• Privacy: The glass block is used for entryway and bathroom privacy, blocking prying eyes so when someone stands right up to the glass, they can only see vague shapes inside.
• Non-load-bearing wall: Glass block can be used as an interior non-load-bearing wall alongside foyers or in bathrooms to shield the toilet area while diffusing light in the space.
• Security: Glass block windows provide security as they can’t be opened and are difficult to smash.
• Aesthetics: As a design element, a glass block wall or window brings an art deco or modern look to a room.

Disadvantages of Glass Block

• Not load-bearing: A glass block window or wall looks as substantial as a brick one but does not have load-bearing capabilities. The glass block cannot carry loads other than its own and can be more fragile than it looks.
• Heavy: For exterior walls, you will find that the glass block is so heavy it requires a sturdy base with a properly built sill and cripple studs running vertically below it.
• No ventilation: Glass block windows can have small vents built into them, but you can’t open the entire window, limiting the amount of ventilation in a room.
• Cost:There is no substantial cost benefit to installing glass block vs. regular windows as they can be similar in price.
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Where to Use Glass Block Windows or Walls

• Bathrooms: Can make the space feel brighter and spacious
• Showers: Adds privacy without blocking natural light
• Front hallways: Brings light into an otherwise dark space and brightens up adjacent rooms
• Foyers: Creates a separation from the living space while letting natural light pass through
• Entrances: Adds a level of security as well as privacy without blocking light
• Basements: Brightens up a lower level by letting in natural light
• Bedrooms:Adds a sense of brightness, and spaciousness, while maintaining privacy, especially if located near street level