How to Install Annealed Glass

Annealed glass is often used when safety is less of a concern.

Annealed glass is glass that has been slowly cooled to relieve internal stresses, making it less likely to break if subjected to temperature changes. It is cheaper to produce than the tougher tempered glass that is also used in windows and doors but is more dangerous. If annealed glass breaks, it forms large shards, which can lacerate people. Because of the chemicals used in its production, tempered glass breaks into small pieces. Tempered glass is also less likely to break in the first place. Annealed glass is installed in windows much the same way as tempered glass.

Things You'll Need

• Scraper
• Linseed oil
• Putty
• Putty knife
• Glass cutter
• Masking tape
• Gloves
• Safety goggles

Instructions

1. Remove any of the old glass. If cracked or broken, apply masking tape over the glass before removing while wearing gloves.

2. Use the scraper to remove old putty from around the frame.

3. Apply linseed oil around the frame. It will prevent the putty you apply next drying out too quickly.

4. Measure the frame and cut the glass to size. Run the cutter over the glass to score it and then break at the score. Wear safety goggles and gloves to do this.

5. Roll out the putty to fit around the frame. Use the putty knife to push the putty into the corners.

6. Place the glass into the frame. Add more putty where the glass and frame meet. Use the putty knife to cut off excess putty and make a straight line.

7. Allow the putty to dry and harden before painting the frame. Three days is an average drying time.

Tips & Warnings

• Check your local building codes. Many states have restrictions regarding the use of annealed glass. Some restrict its use in windows near doors or in high-traffic areas where it would be prone to breakage.

• Take care when handling annealed glass. If it smashes, it can injure you. If installing a large window, enlist help to maneuver large pieces of glass.

References

• Center for Fire Reasearch and Outreach: Glass
• Whole Building Design Guide: Building Envelope Design Guide -- Glazing
• Glazette: Annealed Glass
• Lake Norman Supply Inc: Tempered or Annealed Glass
• Austin Glass: The Secret of Cutting Glass
• Fine Home Building: How To Replace a Window