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How to Install Plexiglass over Windows: A Step-by-Step Guide

May 19, 2023


If you're looking for a way to add an extra layer of protection to your windows without compromising visibility, consider installing plexiglass. Plexiglass, also known as acrylic glass, is a lightweight and shatter-resistant alternative to traditional glass. In this step-by-step guide, we'll walk you through the process of installing plexiglass over your windows.

What You'll Need

Before you get started, gather the following materials:

  • Plexiglass sheets
  • Cutting tool (e.g. circular saw, jigsaw)
  • Drill and screws
  • Measuring tape
  • Clamps
  • Safety goggles and gloves

Step 1: Measure Your Windows

Measure the length and width of your window frame and subtract 1/8 inch from each measurement. This will allow for a proper fit and prevent the plexiglass from cracking due to expansion during temperature changes.

Step 2: Cut the Plexiglass Sheets

Using a circular saw or jigsaw, carefully cut the plexiglass sheets to match the measurements of your window frame. Be sure to wear safety goggles and gloves to prevent any injuries.

Step 3: Pre-Drill Screw Holes

Using a drill, pre-drill screw holes along the edges of the plexiglass sheets. These holes should be spaced about 6 inches apart.

Step 4: Install the Plexiglass Sheets

Carefully place the plexiglass sheets over your window frame and secure them in place using clamps. Starting from one corner, drill screws through the pre-drilled holes and into the window frame.

Step 5: Trim Any Excess Plexiglass

If there is any excess plexiglass sticking out beyond the window frame, carefully trim it using a cutting tool.


By following these simple steps, you can easily install plexiglass over your windows for added protection. Remember to wear protective gear and handle the plexiglass sheets with care to prevent any injuries. Enjoy your newly protected windows!


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