To soundproof a conference room, stop sound from leaking through the walls, door, ceiling and ducts: build walls to the structural deck above the ceiling, add insulation and an extra layer of drywall, seal every gap, use a solid-core door with seals, and line or baffle shared ductwork. Acoustic panels don't soundproof; they absorb echo inside the room. Most conference rooms need both: soundproofing for privacy and panels so video calls sound clear.
Soundproofing vs sound dampening
| Soundproofing (isolation) | Sound dampening (absorption) | |
|---|---|---|
| Goal | Keep sound in or out | Reduce echo and reverb inside |
| How | Mass, decoupling, sealing | Soft, porous surfaces |
| Rated by | STC | NRC |
| Examples | Double drywall, insulation, door seals | Acoustic panels, ceiling tile, carpet |
| Helps video calls? | Reduces outside noise | Yes, a lot |
Where sound leaks
- Over the wall. Many office walls stop at the drop ceiling. Sound travels through the ceiling tiles and plenum into the next room. This is the most common leak.
- The door. Hollow-core doors and gaps at the bottom leak a lot.
- Gaps and penetrations. Outlets back to back, cable holes, gaps at the floor.
- Ductwork. Shared ducts carry voices between rooms.
- Glass. Single-pane glass walls and sidelights.
How to soundproof, from most to least impact
| Step | What to do | Notes |
|---|---|---|
| 1 | Extend walls to the structural deck | Or add a plenum barrier above the wall |
| 2 | Fill wall cavities with insulation | Mineral wool or fiberglass batts |
| 3 | Add mass | Second layer of 5/8-in drywall; damping compound between layers |
| 4 | Decouple | Resilient channel or staggered/double studs for high STC |
| 5 | Upgrade the door | Solid-core door, perimeter seals, automatic door bottom |
| 6 | Seal gaps | Acoustic sealant at edges; offset outlets; putty pads on boxes |
| 7 | Treat ducts | Lined ducts, cross-talk silencers, or longer duct runs |
| 8 | Improve glass | Laminated or double glazing |
| 9 | Higher-CAC ceiling tiles | Helps when walls stop at the ceiling |
Typical targets are STC 45 to 50 for normal meeting rooms and higher for HR, legal or executive rooms. See acoustic requirements and ratings.
Quick fixes for existing rooms
- Door sweep and weatherstripping on the existing door.
- Acoustic sealant along wall bases and around penetrations.
- Plenum barrier blankets above the ceiling over the wall line.
- Swap ceiling tiles for higher-CAC tiles.
- Sound masking in surrounding open areas to cover what still leaks. See sound masking.
Sound dampening for clear calls
Once the room is sealed, fix the inside:
- Acoustic panels on at least two adjacent walls, at seated head height. See acoustic panel placement.
- Acoustic ceiling tile instead of drywall where possible.
- Carpet or a large rug on hard floors.
- Curtains or film on glass walls.
- Upholstered chairs and soft furnishings.
Read our guide to reducing room echo and the full acoustics guide.
Do you need a contractor?
Wall, door and duct work is construction, so involve your facilities team, landlord or a contractor, and check building and fire codes, especially for plenum barriers and penetrations through rated walls. Panels and door seals are usually DIY.
Once the room is quiet, the right mics make a big difference. Tell us about the room and we'll suggest audio that suits it.
Related guides
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