General construction: how buildings go together
Sound insulation in buildings
Noise travels as airborne sound and as impact sound through the structure. Good sound control uses mass, decoupling, absorption and sealed gaps. This guide explains each in plain terms.
Noise travels as airborne sound and as impact sound through the structure. Good sound control uses mass, decoupling, absorption and sealed gaps. This guide explains each in plain terms.
Two kinds of noise
- Airborne: voices, music, TV, moving through air and then through walls and floors.
- Impact: footsteps and dropped items that shake the structure itself.
The four tools
- Mass: heavier layers block more airborne sound.
- Decoupling: separate framing or resilient channels stop vibration crossing.
- Absorption: insulation in the cavity damps sound inside.
- Sealing: gaps leak sound, so seal edges and penetrations.
Ratings
STC (Sound Transmission Class) rates airborne sound blocking; IIC (Impact Insulation Class) rates impact sound. Higher is better. These ratings come from tested assemblies, so the whole assembly must be built as tested. See acoustic insulation procurement.
Common mistakes
Back-to-back electrical boxes, gaps under doors, ducts connecting rooms, and rigid connections across a floor undo good wall design.
Where it matters
Hotels, apartments, retreat rooms and wellness spaces carry sound expectations. The code sets minimums for separating walls and floors in many places.
Quick answers
- Does insulation make a wall soundproof? No. It helps absorb sound in the cavity, but mass, decoupling and sealing matter more.
- What is a good STC? Codes set minimums for dwellings; higher values suit quieter needs. Check your local requirement.
- Why do I hear footsteps upstairs? Impact noise travels through the structure. It needs a floor assembly designed for it.
Keep reading
- Acoustic insulation procurement guide
- Gypsum boards buying guide
- Steel studs vs wood studs for interior partitions
- Fire safety in buildings: the basics
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
Does insulation make a wall soundproof?
No. It helps absorb sound in the cavity, but mass, decoupling and sealing matter more.
What is a good STC?
Codes set minimums for dwellings; higher values suit quieter needs. Check your local requirement.
Why do I hear footsteps upstairs?
Impact noise travels through the structure. It needs a floor assembly designed for it.
Sources and further reading
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