How to Install Glass Block Windows for Beauty and Efficiency

The beauty and efficiency glass block windows offer is well worth the work you will put into installing them yourself. It takes some energy, and is best done with two people working as it's very easy for the window(s) to fall inside if you're not careful. Notice: glass block windows come in panels according to the size of the area you are placing them.

You may need additional tools and/or equipment depending on the project. You can use glass blocks for interior as well as exterior designs (showers, saunas, wall-dividers, etc.). Consult with your local glass block dealer/distributor to configure your design to suit your needs.

Depending on whether these will be exterior windows or interior wall, bar, etc., will determine the length of time it will take to finish the job.

Note: When mixing mortar; use one-half bag of sand to every full bag of cement. Improper mixture will result in poorly setting mortar. This could cause damage to window due to ability to fall or not set properly.

These are the tools and equipment needed to install glass block windows:

Tools
Trowel
Mortar pan
Tape measure
Level
Caulking gun
Small foam brush
Rubber mallet
Rubber work gloves
Tin Snips

Materials
Glass block
Mortar for glass block
White or clear silicone sealant
Spacers/shims

Make certain all areas to be glass blocked are cleaned and level.

Place glass blocks near window to be replaced. If there is tin strapping, use strapping to aid in placing windows in place and make any necessary adjustments. Once window is set in place cut strapping with tin snips.

Mix in wheelbarrow cement/sand mixture to "a bread doe" consistency. This will assure mixture will adhere to sides of windows. Use hoe to thoroughly blend mixture.

Once window area is cleaned place mixture onto mortar pan. Using trowel, evenly distribute mixture around window, smoothing as you go along.

Grip windows (wearing rubber gloves for traction to prevent slippage), and place lower edge of block onto lower ledge of opening. Slowly push window into opening being careful not to push through opening completely.

With window in place, use trowel to scrape gently around frame removing excess mortar as it's squeezed out by pressure. Use rubber mallet to gently persuade window in place as it sets into mortar. Do this by gently tapping on each corner to properly set in place. It may shift as it sets. Once window is fully in place; check level. If out of level, use shims to rise to proper level.

Continue trimming excess mortar until window is fully seated and level.

Allow mortar to dry. Drying time depends on weather conditions. The cooler and damper the air the longer drying will take. Once it dries, apply a bead of silicone sealant around entire window - inside and outside to ensure a good seal. Use water to spread sealant to aid in spreading of sealant.

Use a soapy sponge and small brushes to clean any mortar on face of glass block.

Enjoy your new glass block windows.