How to Cut Foam Board

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Foam board -- more commonly called foamcore -- is used for a variety of art projects, from model building to mounting artwork. Just as it is used for art, there is an art to cutting foamcore correctly. Cutting incorrectly results in shredded and bumpy-edged foam board that looks unprofessional. You can always elevate the quality of your artwork with good craft techniques and similarly, you can deflate creative and talented artwork with poor craft techniques.

How to Cut Foam Board
(Trish Dinwiddie/Demand Media)

Things You'll Need

  • Foam core
  • Utility knife
  • Replacement blades
  • Metal ruler
  • Cutting surface
Step 1

Prepare your workspace.

Trish Dinwiddie/Demand Media
Step 2

Mark the foam board where you want it cut.

Trish Dinwiddie/Demand Media
Step 3

Using a metal ruler, cover the foam board part you want to keep and cut into the part you are going to discard.

Trish Dinwiddie/Demand Media
Step 4

Cut into the foam board with a utility knife breaking through the top surface of paper. Do not use too much pressure.

Trish Dinwiddie/Demand Media
Step 5

Continue cutting until you are clearly through the foam board. This is the trick: Use multiple cuts with minimal pressure.

Trish Dinwiddie/Demand Media
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