Homasote
Sheet Products: Homasote
common names: 440 SoundBarrier
440 SoundBarrier® is a special-density, structural board made from 100 percent environmental Homasote® cellulose fiber, a homogeneous composition manufactured with uniformly distributed protection against termites, rot and fungi and resistance to moisture. It also insulates, with twice the R-value of wood.
NovaCork panels, used for large tackable bulletin board areas, are no longer being produced by Homasote as of summer 2025.

Abbreviation Key
| 1E | One Edge |
| 1S | One Sided |
| 2S | Two Sided |
| B/BB | Patches 1 Side |
| BB/BB | Patches 2 Sides |
| CLR | Clear |
| D/S | Drawer Sides |
| EB2E | Edge Banded 2 Edges |
| EXT | Exterior |
| FR | Fire Rated |
| HDO | High Density Overlay |
| HR | Hard Rock |
| MDF | Medium Density Fiber |
| MDO | Medium Density Overlay |
| MEL | Melamine |
| MR | Moisture Resistant |
| NAT | Natural |
| NSB | No Sap Back |
| OC | On Center |
| P1S | Primed 1 Side |
| PBC | Particle Board Core |
| PERF | Perforated |
| PG | Paint Grade |
| PM | Plank Matched |
| PS | Plain Sliced |
| PTS | Plugged Touch Sanded |
| QTRD | Quartered |
| ROT | Rotary |
| SG | Satin Gloss / Prefinished |
| SMN | Sequence Matched and Numbered |
| STK | Sound Tight Knot |
| SW | Select White |
| UV | Ultra Violet / Prefinished |
| UW | Uniform White |
| VC | Veneer Core |
| WHT | White |
| WPF | Whole Piece Face |
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