How to Cut Fiberglass Duct Board


Fiber glass cut board contains fibers that can be damaging to lungs if inhaled. That means that when cutting such products, safety should be a top concern. In addition, you should use a handsaw or insulation shears to cut the boards properly.

Things You'll Need

  • Protective mask
  • Thin handsaw
  • Insulation shears (optional)

Cover your face and mouth with a protective mask. You may also want to consider using gloves to protect your hands and wearing long sleeved. The fiber glass irritates the skin and can cause damage if you inhale the pieces.

Place the fiber glass duct board in a safe place. You want to make sure that the fiber glass boards don’t move when you’re cutting them as you can hurt yourself.

Measure the area you want to cut and mark those places on the board. This simple tip can save you a lot of time and effort. Measure twice and cut once to ensure that you have the right size you need.

Use a thin handsaw to cut the duct board. A thin handsaw cuts through the fiber glass without damaging the board or pressing down too hard on the material. A thicker or heavier saw can press against the fiber glass, causing the material to sag.

Cut the duct board using a pair of insulation shears if you prefer. Insulation shears are available from most hardware stores and work well when using fiber glass materials. The shears are coated with a material that lets them easily slice through the fiber glass.

Tips & Warnings

  • Ask your local hardware store employees for the shears or saw they recommend for use with fiberglass if you're not sure about your own tools.
  • Always make sure to cover your face when working with fiberglass. Don't skimp on this step as it can damage your health.

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