DIY Network

How to Install Glass Block Windows

Glass block windows are a great way to add light to any kitchen.

More in Kitchen

  • Time


  • Price Range

    $250 - $500

  • Difficulty

    Moderate to Hard


Step 1: Remove the Drywall

Determine desired height for windows and snap a chalk line (Image 1). Cut along chalk lines using a circular saw with a carbide-tipped blade (Image 2). Remove drywall, plaster and lath to reveal the studs (Image 3). If you find old knob and tube wiring in the wall, test it to be sure it is not in use (Image 4). Clip the wires and cap them with wire nuts.

Step 2: Create an Opening and Add Wood Blocks

Use a reciprocating saw to cut through the siding and create the opening (Image 1). Add blocks of wood to the top, bottom and sides to act as nailing blocks (Image 2).

Step 3: Staple Tar Paper Outside

Staple tar paper on the exterior of the house around the window opening.

staple tar paper around window opening

Step 4: Secure the Glass Block

Run a bead of silicone to the flange of the glass block window (Image 1) and set in place (Image 2). Check for level and secure the window with screws (Image 3).