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Intermediate2-3 days

Sofa Cushion Replacement Guide

Learn sofa cushion replacement from scratch with a clear step-by-step workflow, recommended tools, safety guidelines, and expert tips.

home DIYerslandlord maintenance

Workflow

  1. Measure Existing Cushions

    30 min

    Record length, width, thickness, and cushion count including back and seat sections.

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  2. Select Foam and Wrap

    1 hour

    Choose HR foam density by use — seat cushions need 2.0+ lb density for longevity.

  3. Cut Fabric and Sew Covers

    4 hours

    Sew boxing strips to top and bottom panels with hidden zipper in back boxing.

  4. Assemble and Fit

    1 hour

    Insert wrapped foam, close zippers, and test fit on frame adjusting fill if sagging.

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Tools Used

Checklist

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Planning

Preparation

Safety

Execution

Quality

Documentation

Reference Materials

Foam DensityStandard

Density (lb/ft³) = foam weight ÷ volume; higher density lasts longer under daily use.

Zipper PlacementFormula

Place zipper in rear boxing centered — hidden when cushion on sofa.

Foam GradesTable

Residential foam selection.

UseDensityILD
Seat2.0+35–45
Back1.525–35
Throw pillow1.2Soft

  • Foam Cutting

    Electric knife or hot wire — ventilate, foam fumes irritate lungs.

  • Heavy Cushions

    Large sofa cushions awkward to sew — lift with proper technique.

  • Static

    Foam chips cling and jump — eye protection when trimming.

Safety Notes

  • Unplug electric foam cutter when not in use.
  • Support sewing machine needle when crossing thick boxing seams.

Related Scenarios

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Antique Restoration — Upholstery Restoration