A Compostable Office Cubicle Wall Material: The Mycelium Panels Quietly Replacing Fabric Partitions

For about fifty years, the standard interior office cubicle wall has been a fabric-wrapped panel core of fiberglass or mineral wool, bonded with phenol-formaldehyde resin, mounted on a powder-coated steel frame. When you walked into an office in 1992 and saw the gray-blue felt-textured rectangles dividing every workstation into a five-by-six box, that’s what you were looking at. Same panel, basically, in 2008. Same panel — depressingly — in 2024.

There’s now a small but real alternative that’s actually compostable: mycelium-based acoustic panels. Grown — not manufactured. Fungal mycelium running through agricultural waste substrate, formed into rigid acoustic-rated panels, finished with natural binders. You unscrew them from the cubicle frame at end of life, drop them in a commercial composter, and within a few months they’re broken down completely.

This is one of those facts that surprises people not because mycelium products are new — the materials science has been published since the early 2010s, and Ecovative was already selling protective packaging to Dell by 2013 — but because most office workers have no idea their cubicle wall could be anything other than the fabric-and-fiberglass thing. The shift has happened slowly enough, and in a specific enough range of projects, that it hasn’t reached general awareness.

Worth a few minutes to understand what these panels actually are and where they show up.

What mycelium is, and how a wall panel grows

Mycelium is the underground root structure of fungi. When you see a mushroom poking out of forest floor, that’s the fruiting body. The mass of white thread-like filaments fanning out through the soil and decomposing matter below — that’s mycelium. It’s the part that does the actual eating, breaking down lignin and cellulose into simpler molecules. Fungal mycelium has one structural quality that’s particularly useful for making things: as it grows through a substrate, it binds the substrate together into a solid, lightweight mass.

The process for making a mycelium panel is closer to baking than to manufacturing. You start with an agricultural waste substrate — most commonly hemp hurds, corn stalks, sorghum, or sometimes rice husks, depending on what’s locally available to the producer. The substrate is pasteurized, inoculated with a specific strain of fungal mycelium (typically Ganoderma lucidum, the reishi mushroom, or Pleurotus ostreatus, the oyster mushroom, or proprietary strains the producers have selected for their growth characteristics), packed into a mold the shape and dimensions of the final panel, and left to grow for five to seven days in a humidity- and temperature-controlled chamber.

The mycelium runs through every available crevice in the substrate, weaving a dense network. When growth is complete, the panel is heat-treated — typically at around 120-150°C — to kill the fungus and cure the structure. The result is a rigid, dimensionally stable board that holds its shape, absorbs sound, and weighs roughly a third of what comparable fiberglass panels weigh.

It looks, to the touch, like very firm bread. Not what you’d expect a wall panel to feel like the first time. There’s no other commercially available material that’s both grown and rigid enough to use as an interior wall element.

What “compostable” means in this specific case

This is where mycelium panels get interesting from a foodservice and sustainability standards perspective. Because the substrate is agricultural waste and the binder is the fungus itself — no phenolic resins, no formaldehyde, no plastic backing — the panel at end of life is genuinely organic matter.

A 24-inch by 48-inch mycelium acoustic panel from a producer like Mogu (the Italian company that’s been the most aggressive about pushing into commercial interiors) or Ecovative weighs roughly 4-6 pounds. Dropped into a commercial composter operating at industrial composting temperatures — 55-65°C — the panel breaks down completely within 60-90 days. ASTM D6400-tested. The Italian environmental certification body has verified end-of-life biodegradability for Mogu’s product line; Ecovative’s MycoComposite material has BPI commercial composting certification.

Compare that to a conventional fabric-wrapped fiberglass cubicle panel. The fiberglass is itself melt-down recyclable in theory but in practice almost never recycled — there’s no consumer collection stream, and the panels arrive at the recycler still mounted on their steel frames and wrapped in fabric, which makes processing uneconomic. The standard end-of-life for cubicle furniture is the landfill. Steelcase’s own published lifecycle data on their cubicle products acknowledges this — the panels are designed for material recovery in theory, but the actual recovery rate in the field is low single digits.

A mycelium panel is the rare interior product where the end-of-life story is genuinely cleaner than the conventional alternative.

Where they’re actually being specified

This is not yet a mainstream product. As of mid-2025, mycelium acoustic panels show up in maybe a few dozen completed office projects in the US, somewhat more in Europe, and a handful in Asia. The buyers fall into recognizable patterns:

• Architecture and design firms designing their own offices. This is the largest single category. When an architect specifies materials for their own studio, they get to make the call without pushing it through a corporate procurement process. Several A&D firms in New York, Copenhagen, Milan, and the Bay Area have installed mycelium panels in their own offices as a kind of advertisement of capability.
• Universities renovating departmental spaces. Sustainability-mission universities — the University of British Columbia, Wageningen in the Netherlands, a few of the Cal State campuses — have used mycelium panels in renovations of departmental offices and research building lobbies.
• Corporate sustainability flagship offices. A small number of companies whose brand is built around sustainability claims — Patagonia (their Ventura HQ has mycelium acoustic elements), Allbirds (their San Francisco office), a few cosmetics and personal-care brands — have used them in feature interior elements.
• Adaptive reuse projects in former agricultural or industrial buildings. Architecturally these projects often want to lean into natural materials, and mycelium panels work as a visual and conceptual fit.

The buyers do not yet include the big single-tenant office REIT operators, the giant tech campuses, or the bulk-buyer institutional procurement programs at Fortune 500 companies. Those markets are still buying Steelcase, Haworth, Herman Miller, and the few non-mycelium “sustainable” cubicle panel lines from those manufacturers.

What they cost

Per square foot, a mycelium acoustic panel sells in 2024-2025 for roughly $18-$38, depending on producer, thickness, finish (some are sold with a cellulose veneer, some are bare mycelium), and order volume. By comparison, a conventional fabric-wrapped cubicle panel from one of the big three sells in the same kit-of-parts configuration for roughly $8-$16 per square foot.

So mycelium is two to three times the price. That’s the gap that has kept it out of the bulk market and confined it to projects where the architect is willing to argue for it on the basis of brand alignment or stated sustainability targets.

The producers all argue that the gap will narrow significantly as production scales. Whether that happens depends on whether anchor commercial customers — the big cubicle-buying corporations — commit to volume orders that justify expanded production capacity. So far the volume hasn’t materialized.

Acoustic performance, which is actually the point

What’s specifically interesting about mycelium for cubicle walls is the acoustic performance. A fabric-wrapped fiberglass cubicle panel exists, in part, for sound absorption — keeping conversations from one workstation from bleeding into the next. Manufacturers publish noise reduction coefficient (NRC) values. A typical mid-grade office cubicle panel has an NRC of about 0.65-0.75, meaning it absorbs about two thirds of the sound that hits it.

Mycelium panels of similar thickness — typically 2-inch — test at NRC values of 0.75-0.85 depending on the substrate and density of the fungal growth. They’re competitive on acoustic performance with the conventional product and in some configurations outperform it. The porous, irregular internal structure of the mycelium network is well suited to absorbing sound across a wide frequency band.

So the acoustic case for mycelium is genuinely strong. It’s not a “we’re accepting worse performance for environmental reasons” trade-off in the way some sustainable substitutes are. The price is the real trade-off.

Other applications of the same material family

The same mycelium-substrate composite shows up in a number of other product categories, which is part of what’s encouraging about it as a material:

• Protective packaging. Ecovative built its early business around mycelium protective packaging for electronics, cosmetics, and luxury goods. Dell shipped server packaging with it for several years.
• Furniture. Italian designer brand Mogu has launched a line of mycelium-cored chairs, tables, and floor tiles.
• Building insulation. A handful of European companies — Biohm in the UK is one — are developing mycelium-based insulation panels.
• Faux leather. This is the most commercially aggressive use case: Bolt Threads’ Mylo material and MycoWorks’ Reishi are leather alternatives grown from mycelium. Lululemon, Hermès, and Adidas have all used or piloted these materials.

The fact that the same fungal-substrate composite shows up across this many applications suggests the materials science is robust. It’s not a one-application novelty.

What can go wrong

A few honest notes on limitations:

Humidity sensitivity. Mycelium panels are organic matter. In conditions of sustained high humidity — above about 75% — they can develop surface molds or, in extreme cases, reactivate fungal growth. This is one reason they’re sold for interior applications only. They’re not appropriate for bathroom walls, for exterior cladding, or for spaces that aren’t climate controlled.

Fire performance varies by producer. Conventional cubicle panels are typically Class A fire-rated. Some mycelium panels meet Class A through additional treatment; some only meet Class B. The architect specifying needs to confirm the rating against local code requirements for the specific use case.

Visual variation. Mycelium panels are grown, not pressed, and the surface has natural variation in color and texture between panels. Producers describe this as a feature; some corporate clients have found it harder to standardize visually across a large office. There’s typically a more uniform finish option available with a cellulose veneer if the visual variation is a concern.

Limited current production capacity. The largest producers can deliver panels for a 5,000-square-foot office in normal lead times of 8-12 weeks. Larger orders run longer. This makes mycelium panels a non-starter for fast-track corporate buildouts on tight schedules.

How this connects to the broader compostable materials story

The reason mycelium cubicle panels are worth pulling out as a fun fact rather than just another sustainable building product is that they fit a specific pattern that’s worth recognizing. The pattern is: agricultural waste plus a biological process producing a finished product that’s compostable at end of life, replacing a conventional product that ends up in landfill.

You see the same pattern in compostable foodware. Sugarcane bagasse — a byproduct of cane sugar production — is the substrate for the bagasse plate and clamshell that’s quietly replacing styrofoam in cafeterias. Wheat straw becomes plates. Bamboo, after processing, becomes utensils, plates, and food service ware. The shift from petrochemical-based interior materials to agricultural-waste-based interior materials parallels the shift from petrochemical-based foodware to agricultural-waste-based foodware. The economics are similar, the supply chains are similar, the certification regimes are similar (BPI, ASTM, the European EN standards).

If you operate a foodservice or hospitality business that’s already buying compostable food containers, tableware, and bowls, you’re already participating in this material substitution story. The cubicle wall in your operations office is just the same story playing out in a slower-moving category. Foodware turns over in days; building interiors turn over in decades. The signal for foodware is that the substitution has already happened at meaningful scale. The signal for building interiors is that the early adopters have signed on, the materials science is proven, and the price gap is the only thing keeping volume off the table.

Where to look if you want to specify them

A few of the producers worth looking up if this material is something you’re considering for an actual project:

• Mogu (Italy) — the most aggressive about commercial interior applications. Acoustic panels, floor tiles, furniture line. Distributed in North America through a handful of A&D specialty dealers.
• Ecovative Design (Green Island, New York) — the longest-running producer in the space. Their MycoComposite material is BPI commercial composting certified. They license their growth process to other producers as well.
• Biohm (United Kingdom) — building insulation and panel products. Mostly UK and EU projects so far.
• Grown Bio (Netherlands) — packaging primarily, with some experimental architectural applications.

If you’re an architect or interior designer with a client asking for genuinely circular interior materials, mycelium panels are now a defensible specification on technical grounds. They’re acoustic-competitive, dimensionally stable in HVAC-conditioned interiors, and the end-of-life story is among the cleanest in the building products industry.

If you’re an office worker reading this from your fabric-wrapped fiberglass cubicle, the odds your next office has mycelium walls are still low — but they’re meaningfully higher than they were five years ago, and meaningfully higher again than they’ll be in another five.

That a fungal byproduct grown on agricultural waste in five days can outperform a 50-year-old industrial product on its own primary performance metric — sound absorption — and also break down to soil in 90 days at end of life is, on its face, a kind of quiet miracle of materials science. Whether the office furniture industry catches up to that fact in time to matter for the next thirty years of corporate buildouts is the question. The signal so far is encouraging but slow.

A small additional note on what mycelium panels are not

A few things to clear up because they come up:

• They are not the same as mycelium leather. The leather products use mycelium grown into thin flexible sheets, surface-treated very differently than the rigid composite panels.
• They are not the same as hempcrete or hemp insulation. Those use raw hemp fibers and a lime binder. Mycelium products use hemp (or other substrate) bound by fungal growth, with no lime. Different materials, different performance characteristics.
• They are not mushroom paneling in the sense of dried whole mushrooms or mushroom slices stuck to a wall. The mushroom (fruiting body) is not the structural component. The mycelium (the root network) is.

For curious readers wanting the technical paper trail, the Building Research Establishment in the UK has published a peer-reviewed assessment of mycelium-based building products, including the panel category, available through their BRE library — useful if you want to see independent test data rather than producer marketing.

The next time you walk into an office that looks slightly off — the walls maybe lighter, slightly textured, a bit softer to the touch than you’d expect — check the panels. If they look like very firm pale-brown bread, you’re looking at mycelium. Which means in five to ten years, when that office is renovated, those walls will go to a commercial composter instead of a landfill. Quietly, in the background, the cubicle wall is starting to look different.

For B2B sourcing, see our compostable supplies catalog or compostable bags catalog.

Background on the underlying standards: ASTM D6400 defines the U.S. industrial-compost performance bar, EN 13432 harmonises the EU equivalent, and the FTC Green Guides govern how “compostable” can be marketed on packaging in the United States.