What's the trick to cutting duct liner so the edges don't fray?

Use a razor-sharp insulation knife or a long carving blade. Compress the fiberglass flat with a straightedge steel ruler along your cut line, then slice through cleanly in one continuous stroke.

['Use a razor-sharp insulation knife or a long carving blade. Compress the fiberglass flat with a straightedge steel ruler along your cut line, then slice through cleanly in one continuous stroke.']

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• Use a razor-sharp insulation knife or a long carving blade. Compress the fiberglass flat with a straightedge steel ruler along your cut line, then slice through cleanly in one...

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