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Energy Efficient Glass Block Windows

Glass-block windows remain a favorite among savvy home owners. They look cool, offer additional security, are inexpensive and offer energy savings. A normal glass-block window has similar insulation qualities to a standard double-pane thermal window.


Regular residential glass-block windows aren’t solid glass, but they consist of 2 two hollow rectangular halves that are joined at high temperatures. It makes the joints air-tight and prevents fogging, making it perfect for bathrooms. This high-temperature fusing causes a partial vacuum to form within the glass block. When the block cools down after the fusing, the air inside it contracts producing a fantastic insulating quality.

A glass block window will eliminates air leakage around it because it is sealed with mortar directly into the wall.
As a homeowner you can:
• Slash utility costs & bills
• Eliminate pesky drafts
• Cut out outdoor noise
• Prevent dust

For heat control in the summer months, some glassblock windows have a reflective coating to cut the heat increase. With the layers of mortar in between each block, light is natural controled. When the sun is low in the sky, it shines in through the glass-block window. In the summer, the sun is higher in the sky. The steeper rays are blocked by the mortar joints, keeping your home cooler. You may also have screened vents installed in the window to provide ventilation.