How to cut thick glass

Written by kayar sprang
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Sometimes do-it-yourself projects around the house--such as replacing a window--require you to cut thick glass. There are basically two ways to do this: using the snap method or using a wet saw. The best way depends on the thickness and the type of glass you're working with. The snap method is the easiest, but it doesn't always work. Never fear! A wet saw does the trick.

Skill level:

Things you need

  • Safety goggles
  • Heavy gloves
  • Glass cutter with a wheel
  • Wet saw

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    Cut Thick Glass Using the Snap Method

  1. 1

    Put on the safety goggles and the heavy gloves for protection.

  2. 2

    Measure and mark a straight line on the thick glass where you want to cut it. A grease pencil works well for marking glass.

  3. 3

    Place some light oil or kerosene on an old cloth. Run the glass cutter slowly across the cloth so the wheel picks up a coating of the oil.

  4. 4

    Hold the glass cutter firmly between your thumb and finger. Apply a slight pressure as you score the thick glass carefully along the line using the glass cutter.

  5. 5

    Place the thick piece of glass on a table or work bench that has a straight, hard edge. Align the scored line up with the hard edge. Push down quickly to break the glass.

    Cut Thick Glass Using a Wet Saw

  1. 1

    Familiarise yourself with the wet saw, and follow the instructions in the owner's manual before you use it. This machine is an electric saw built into a table. It uses a diamond blade to cut material like ceramic tiles and glass. Water sprays onto the blade as the wet saw cuts to keep the blade cool.

  2. 2

    Adjust the rip fence on the saw so the blade lines up with the mark you made on the thick glass.

  3. 3

    Hold the glass firmly as you use the wet saw to cut thick glass. Push it slowly against the blade with both hands, but don't force it.

  4. 4

    Cut the thick glass all the way through, then turn the wet saw off.

Tips and warnings

  • Score and cut mirrored, thick glass on its reflective side.
  • Score each piece of thick glass only once with the wheeled glass cutter or it will damage the blade.
  • Be careful handling pieces of thick glass, especially the sharp edges.

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