---
title: "Foam Cushion Not Expanding After Unboxing? Give It a Week"
url: "https://cushionguide.com/answers/foam-sofa-cushion-flat-after-unboxing/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-03-01"
updated: "2026-03-01"
keywords: "foam cushion not expanding, sofa cushion flat after unboxing, compressed foam recovery time, floor sofa cushion lumpy, replacement foam cushion"
---

# Some of my sofa cushions are still flat after unboxing. What should I do?

*Compressed foam runs on its own clock, not the courier's. Here's the schedule, and the point where patience ends and a replacement begins.*

Also asked as: Two pieces have not expanded the same; The middle section is completely flat

> **The quick answer:** Give a flat foam cushion more time: compressed foam can keep expanding for another 1 to 2 days, and full recovery can take up to a week. Take the foam out of its cover, shake it and pull it from both sides, then re-cover it. If a piece is still flat, dipped or lumpy after several days, send photos for replacement foam or extra filling.

![Sage green and cream velvet floor sofa with a sage-faced bolster, beside a wooden stool with a white vase and a jute rug](https://cushionguide.com/media/modular-floor-sofas/sage-floor-sofa-wooden-stool-linen-curtain-1600.webp "A calm, nearly bare corner where sage velvet, raw wood and a linen curtain carry the look.")

## Key facts

- Compressed cushions may need 1 to 2 extra days to recover.
- Full expansion can take up to a week.
- Taking the foam out of the cover and shaking it helps it expand.
- Photos of the uncovered foam are forwarded to the foam producer.
- Replacement foam or extra filling is sent when a piece stays under-filled.
- A pouf chair seat is softer than its ottoman by design.

## Normal recovery, or time to send photos?

| What you notice | When | What to do |
|---|---|---|
| Pieces not equally full | First days out of the box | Wait: foam can keep expanding another 1 to 2 days |
| One piece still softer | Any time in the first week | Uncover, shake and stretch the foam |
| Pouf chair seat sinks more than its ottoman | Any time | [yes] Normal: the seat is made to let you sink in a little |
| Corner bolster still soft in the middle | After 3 days | Photos; a replacement was sent |
| Flat, dipped or lumpy | After several days | Photos with the cover off, for replacement foam or filling |

## Helping a slow piece along

1. **Unzip and remove the foam**: Take the insert fully out of its cover.
2. **Shake it, then pull from both sides**: Grip opposite edges and stretch gently so the foam can expand, then put the cover back.
3. **Wait, then compare**: Check again after a few days. The [first 72 hours pattern](https://cushionguide.com/guides/vacuum-packed-cushion-first-72-hours/) covers unpacking.

## Why the photo should show bare foam

A cover can hide a dip or exaggerate one. Bare foam can't. Photos of the uncovered insert go to the foam producer, and when a piece really is under-filled, the workshop sends replacement foam or extra filling.

Keep the tolerance in mind, partner: a [modular floor sofa](https://cushionguide.com/cushions/modular-floor-sofas/) seat and a pouf chair are built to feel different, and [foam recovery](https://cushionguide.com/glossary/#foam-recovery) is measured in days, not hours. How many days has yours been out of the box?

> **Tailor's margin:** A foam cushion that's still flat on day 2 isn't faulty yet: compressed foam can take up to a week to reach full thickness.

> If a foam cushion is still flat, dipped or lumpy after several days, photograph the bare foam with the cover off; that photo goes to the foam producer.
>
> — Nate Kowalski

## Buyer questions

**A common question:** Some cushions are still flat or softer after several days while others are firm. How do I fix it?

**The workshop's answer:** Wait a little longer, then take the foam out of the cover, shake it and pull it from both sides so it can expand, and put the cover back. If a piece still stays flat or dips, send photos, ideally with the cover off, for replacement foam or extra filling.

**A common question:** One L-shaped corner cushion looks lumpy and less full than the other. How can I make it fuller?

**The workshop's answer:** Give it more time, because the foam can keep expanding for another 1 to 2 days, and work the foam out of the cover. When a corner bolster was still soft in the middle after 3 days, the workshop sent a replacement.

**A common question:** The seat of my pouf chair sinks much more than the ottoman. Is it underfilled?

**The workshop's answer:** Not necessarily. A pouf chair is meant to let you sink in a little, and full expansion can take up to a week. When one seat stayed soft past that, extra filling was sent.

## Questions buyers ask next

### How long should I wait before asking for replacement foam?

Several days. Foam can keep expanding for 1 to 2 extra days and take up to a week to recover fully; if a piece is still flat, dipped or lumpy after that, send photos.

### Should the cover stay on while the foam recovers?

Take it off to help. Remove the foam, shake it and pull it from both sides, then put the cover back on.

### If extra filling is sent, how does it go in?

By hand, at home. In one case the workshop sent extra filling for the buyer to add to a pouf chair seat and sew closed.

## Related at the atelier

- [One cushion still hasn't expanded after a few days. What should I do?](https://cushionguide.com/answers/cushion-not-expanding-after-vacuum-packing/): A foam cushion that hasn't fully expanded usually recovers if you take the cover off, shake, pull and pinch the foam, and give it a few more days.
- [Can you make the floor sofa seat cushions thicker?](https://cushionguide.com/answers/floor-sofa-mattress-thickness/): No, floor sofa mattress thickness can't be customized: each seat mattress is about 7.5 in (19 cm) thick, or about 15 in (38 cm) with both stacked as a sofa, in 28-density high-density foam.
- [My sofa cushions lost their shape or never fully expanded. Will you replace them?](https://cushionguide.com/answers/sofa-cushions-lost-shape-not-expanding/): Sofa cushions that lose their shape within weeks or never fully expand are worth reporting to the workshop, with how many cushions are affected and when the box was opened.
- [Cut-to-size foam vs a finished cushion: the honest comparison](https://cushionguide.com/guides/cut-to-size-foam-vs-finished-cushion/): Cut-to-size foam is enough when you already own a cover you love or plan to sew one: you specify length, depth, thickness, density and firmness, and the fit is yours.
- [Bay Window Cushion in Tiger Stripe: How to Order a Curve Right](https://cushionguide.com/readings/curved-tiger-stripe-bay-window-cushion-arched-windows/): To order a bay window cushion right the first time, send every measurement on one labeled drawing, including straight ends and each slanted side, plus the exact fabric code.
- [L-Shaped Mudroom Bench Cushion: Order It Right the First Time](https://cushionguide.com/readings/sage-l-shaped-mudroom-corner-bench-cushion-golden-retriever/): Order an L-shaped bench cushion as two separate pieces that meet at the corner, each with its own size range, the same thickness written on both, and the fabric code in the note.
- [Your cushion arrived vacuum-packed: what happens in the first 72 hours](https://cushionguide.com/guides/vacuum-packed-cushion-first-72-hours/)
- [Measuring a T-cushion for an armchair or sofa, ear to ear](https://cushionguide.com/guides/t-cushion-replacement-measuring/)

*± 1/4 in — Nate*

---

Written by Nate Kowalski (https://cushionguide.com/masters/nate/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/answers/foam-sofa-cushion-flat-after-unboxing/