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The Cutting Table · a checklist answer

What density foam is inside a floor sofa?

Also asked as:what is the foam densitywhat kind of foam is in the couch

Everyone asks whether a floor sofa is comfortable. The sharper question is which number sits inside it. Here is the number, and five lines to ask any seller.

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The Pattern Engineer of Detroit · · Updated

Rust orange and cream velvet floor sofa on a jute rug, with pampas on a rattan table, wicker baskets and stacked booksSave
Rust velvet ends pick up the jute rug, rattan table and baskets around this floor-level sofa.

The quick answer

Floor sofa seat mattresses use 28-density high-density foam, about 1.75 lb/ft³ (28 kg/m³): a medium-hard flexi foam that stays comfortable and lasts for years without collapsing. Some replies quote it as 28 to 32 density, and one corduroy sofa was given as 32. The backrests are foam-filled too, and replacement foam is sold on its own.

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Key facts

  • Seat foam: 28 density, about 1.75 lb/ft³ (28 kg/m³).
  • Described as medium-hard, high-density flexi foam; one reply added a 42 ILD firmness.
  • Some replies quote 28 to 32 density; one corduroy sofa was given as 32, about 2.0 lb/ft³ (32 kg/m³).
  • Built to last for years without collapsing.
  • Backrests are foam-filled.
  • Standard covers are 100% polyester corduroy, in fabrics from a mill certified to OEKO-TEX Standard 100 (03.T.3239).
  • Replacement foam is sold on its own.

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Fabric · Foam · Pipingwhat the workshop will confirm with you

Fabric
Some replies quote 28 to 32 density; one corduroy sofa was given as 32, about 2.0 lb/ft³…
Foam
Seat foam: 28 density, about 1.75 lb/ft³ (28 kg/m³).
Piping
The corded seam edge: matching, contrast or none.
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In inches: length × depth × thickness, plus any angles or cut corners.

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Five things to ask any floor sofa seller

  1. Seat density. Here: 28, about 1.75 lb/ft³ (28 kg/m³). Cheaper look-alikes often save money on low-density foam.
  2. Firmness. Density is not firmness. This seat is medium-hard; one reply put it at 42 ILD.
  3. Backrest fill. Foam-filled here; copies often use solid foam blocks.
  4. Cover fabric. 100% polyester corduroy as standard, from OEKO-TEX Standard 100 certified mills.
  5. Replacement foam. Ask if it is sold alone. Here it is, so a tired seat does not mean a new sofa.

28 or 32: why you'll see two numbers

The usual answer is 28 DNS. Sometimes it's given as 28 to 32, and a corduroy sofa was once quoted at 32. I read that the way I read any spec sheet, partner: 28 is the stated number, 32 the top of the band. If the exact figure matters, ask for it on your order. What number did the last listing you looked at give?

To convert, divide kg/m³ by 16.02. The density conversion table has the rest, and how long foam lasts covers what density means for the years ahead.

When a seat finally tires

Replacement foam is sold without covers: full sofa foam sets, with the metal supports if you need them, quoted per set through a dedicated link. Pillow fillings and foam-only backrest inserts go the same way; see foam inserts.

A floor sofa seat on 28-density foam, about 1.75 lb/ft³, is medium-hard and built to last years. Cheaper look-alikes save money on low-density foam and solid backrests.

Nate
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Buyer questions

  1. A common question

    What foam density do you use in the modular sofa?

    The workshop's answer

    The seats use 28-density high-density foam with a 42 ILD firmness, and the backrests are foam filled. Cheaper look-alikes often use low-density foam and solid-foam backrests.

  2. A common question

    What density is the seat foam in the teddy floor sofa?

    The workshop's answer

    Medium-hard, high-density flexi foam rated 28 density (28 DNS), under corduroy outer covers.

  3. A common question

    What is inside the cushions, and will they flatten?

    The workshop's answer

    Medium-hard foam at 28 density, sometimes quoted as 28 to 32. It is meant to last many years, and replacement foam is sold on its own.

  4. A common question

    What foam and fabric are your sofas made of?

    The workshop's answer

    In that reply, 32-density high-density foam that won't collapse over time, under 100% polyester corduroy chosen for its soft feel and wear resistance, in fabrics from a mill certified to OEKO-TEX Standard 100 (03.T.3239).

Questions buyers ask next

How do I convert foam density from kg/m³ to lb/ft³?

Divide by 16.02. So 28 kg/m³ is about 1.75 lb/ft³ and 32 kg/m³ is about 2.0 lb/ft³. Density is weight for volume; firmness is a separate measurement, usually given as ILD.

Is 28-density foam dense enough for a sofa used every day?

In these floor sofas, yes. It is a high-density, medium-hard foam that the workshop says lasts for years without collapsing. Bench cushions from the same workshop use a firmer 32 density.

Can I buy just the foam for a floor sofa, without covers?

Yes. Foam is sold on its own, from pillow fillings and foam-only backrest inserts to full sofa foam sets with the metal supports if needed, quoted per set through a dedicated link.