How to Cut Upholstery Fabric Over Foam
Cut cover fabric accurately over, or bonded to, foam with a square-point knife held low. Use the 60570 for straight panels and the 60090 for shaped work.
What you need
Model 60570Square Point Knife, Wood Handle
$14.50 each$10.06 each at 100 or more
Model 60090Square Point Knife, Wood Handle
$13.57 each$9.41 each at 100 or more
- pattern or marked cut line
- sacrificial cutting board
- chalk or approved fabric marker
- scrap from the actual material stack
Steps
- Decide which job it is: loose fabric over foam, fabric bonded to foam, or trimming on a frame. If you cannot say what lies under the fabric, do not cut.
- Identify the stack: face, backing, batting or liner, foam, and any hard structure below. Clear staples, wire and grit from the cut zone.
- Settle face, grain, nap and pattern direction first. Confirm whether the template line is a seam, stitch or cut line.
- Mark with a chalk or marker proved not to bleed through on the actual fabric.
- Check the knife: tight handle, no rust, chips or damaged corner. Test sharpness on scrap from the real stack.
- Cut a test piece. If fabric bunches or the edge stalls, change the setup.
- Set the fabric flat in neutral tension. Put weights or clamps outside the cut path.
- Lay the blade low, square end leading, and draw smoothly. Use the 60570 on straight runs and shorter 60090 strokes around curves.
Tips
- Keep the knife on the waste side of the cut line.
- A square point reduces stabbing but does not stop the edge cutting the foam below.
- If the edge stalls, withdraw and check tension, backing, contamination and sharpness. Never force it.
- Do not pass the knife edge-first or hide it under fabric or foam.
Watch out
- Keep the off-hand behind or beside the edge, never under the stack or beyond the draw. Cut away from your body.
- A hidden staple or wire can deflect the stroke. Wear eye protection.
- Slicing a foam block to thickness or cutting thick bun foam is a different job. Stop.
Questions about the right tool for your job? Email cs@hydestore.com or call 508-916-6442.

