How to Build a Glass Block Window

Glass block windows are a great choice if you want to let as much light as possible into your living space and still create a bit of privacy. Blocks are available in a variety of sizes and patterns; the most common thickness is 4 inches. The easiest glass block window to build is made with standard square or rectangular blocks. The following steps are a simple explanation of the traditional approach, building your block window with mortar. You can also use an easy-to-install spacer system to make the project appropriate for anyone. Or you can just purchase glass block in pre-fabricated panels You will find detailed instructions for building a glass block window in your block packaging.

Framing materials
Block
Mortar
Spacers
Expansion material
Tools
(See your block packaging for a complete materials list.)

Instructions

- 1
  Frame the window. Determine the window’s dimensions, keeping in mind the size of the block you’ll be using. Calculate the size of the opening based on the instructions included with your block. You can’t cut these blocks to size, so measure accurately and frame well.
- 2
  Install a channel made to hold and support your block or build a track for the block to sit in.
- 3
  Slide one block into each corner of your frame. Apply mortar to the edge of your next block. Slide the mortared edge against one of the blocks already in the frame. Use spacers to align your blocks correctly. Continue adding blocks.
- 4
  Make certain your joints are completely filled with mortar and that your blocks are set firmly in place. Wipe excess mortar away with a sponge.
- 5
  Use expansion strips between rows of block as described in the block packaging. Continue to add mortar and add blocks to complete the window.

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