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loose block window

Here's How:
Measure the opening.  With our opening the width varied from 34 1/4" - 34 1/2" and  height varied from 34 1/2" - 34 3/4".  Use the shorter dimensions (34 1/4" x 34 1/2") to bulid your window.  We recommend your finished window be 1/4" - 1/2" smaller in width and height than the opening. 

Our dimensions required us to use 8" blocks and 1x4 for framing.

Here's how we calculated the block size:
Four 8" x 8" acrylic blocks           =       32"
Two T-Bar (track) @ 1/4" thick   =       1/2" 
Two 1x4 @ 3/4" thick                     =   1 1/2"
Total finished size                          =     34"
(Frame material added 2" to the overall width and height.)

Measure Width, Top, Middle & Bottom.
(Use shortest dimension)

Measure Height: Left, Middle & Right.
(Use shortest dimension)

Cut two pieces T-Bar (Track)  to the same width as blocks & cut two pieces 1/4" less than blocks.
(NOTE: If a miter saw is available, simply apply the full length of t-bar to the 1x4 and miter the corners as needed.)

Cut two 1X4 2" inches
longer than blocks and
cut two 1X4 1/2" longer
than blocks. Apply adhe-
sive to back of track.






Apply track to 1x4.  Use finish nails to hold track to 1x4 making sure track
is centered.

Assemble first row of blocks.

Cut the first row of clips in half with a sharp razor knife, then flip blocks over and mount to the track.

Assemble all blocks together.





Cut clips in half on each end and mount track.


Top and bottom track should equal each other in length and each side should equal each other.

Nail frame together.

Apply adhessive in
seams and smooth
with finger or tool.

Cutting 2


Almost there



Fit window in opening and apply shims in gaps.

While shimming, make sure window is level.

Check both vertically and horizontally.

Insert shims in all sides.

make Square


Level 2



Use 1/4 round molding to cover gap and block the window within your opening.

(For a tight seal, use caulking in all gaps
and seams)

Apply grout tape over dry adhessive with finger.
(Grout tape is for interior use only)

Use roller on grout tape for a better hold.

Paint 1/4 round and
any exposed wood.

1/4 round

Optional tape

tape 2

The End



Materials Purchased from Acrylicblocks4less:

  • Acrylic Blocks
  • Plastic H-Clips
  • 4' T-Bar (track)
  • Adhesive


Other materials Purchased:

  • 1x4 Lumber
  • 1/4 Round molding
  • Finish Nails
  • Shims
  • Paint

Tools Needed:

  • Tape Measure
  • Razor Knife
  • Caulking Gun
  • Hammer
  • Level
  • Paint Brush


acrylic block tape and roller




A division of The Kitchen Store, inc. Est. 1965
6322 West Slauson Ave.
Culver City, CA 90230
Toll free: (800) 726-1747, E-Mail: save@acrylicblocks4less.com