How to Cut Acoustic Panels
Updated
To cut acoustic panels, pick the tool that fits the core: an electric carving knife for foam, a serrated insulation knife for fiberglass or mineral wool board, and a fine-tooth saw for wood slat panels. Framed fabric panels are the exception. Cut one and you'll have to rewrap it, so just order those at the size you need.
| Panel | Tool | Source |
|---|---|---|
| Acoustic foam | Electric carving knife along a straightedge | Auralex (opens in a new tab) |
| Fiberglass or mineral wool board | Serrated insulation knife; circular, miter or table saw with a carbide-tipped blade for big jobs | Rockwool (opens in a new tab) |
| Wood slat panel, across the slats | Fine-tooth saw or oscillating tool | Primacoustic manual (opens in a new tab) |
| Wood slat panel, lengthwise | Utility knife through the felt in a slat gap | Same manual |
With foam, don't force the knife. Auralex says to let the blade do the work. Stone wool dulls utility knives fast, which is why Rockwool prefers the serrated knife. It also recommends safety glasses, gloves, long sleeves and a dust mask, and ear protection if you're using a saw.
Watch out: Cutting across a slat panel can work the slats loose from the felt. Primacoustic says to pin them back down with brad nails or staples, and to wear gloves, since cut slats can have sharp edges.
Mounting the cut pieces is covered in how to install acoustic wall panels. For which panel type to buy in the first place, see the soundproof panels guide. There are more quick answers in the soundproof panels FAQ.