Soundproofing
Soundproof Floors
Underlayments, floating floors, and impact-isolation systems calibrated to your subfloor and finish — proven combinations for IIC-rated performance.
Step 02
Assembly examples
Layer order matters. Compare tested floors systems side-by-side and see how each performs.
Good
Plywood, Super Pad, Carpet Top
Approx. IIC 55
The simplest impact-noise upgrade: a plywood subfloor topped with a Super Pad cushion under carpet. Fast to install over an existing floor and a real improvement on footfall noise.
Better
Rockwool, Subfloor, Serenity Underlay, Double Set, Carpet Top
Approx. IIC 62
Adds Rockwool in the joist bays and a Serenity Ultimate rubber underlay with Double Set padding beneath the carpet — absorbing cavity noise and decoupling footfall from the structure.
Best
Rockwool, Subfloor, Green Glue, Plywood, Serenity Underlay, Double Set, Hardwood Top
Approx. IIC 70+ / STC 60
Our deepest floor build: Rockwool cavity fill, a Green Glue damped plywood-on-subfloor sandwich, Serenity Ultimate underlay and Double Set padding under hardwood — mass, damping, and decoupling all working together.
Step 03
Assembly calculator
Consultation appointments are booked Monday–Friday, 9am–5pm Pacific Time. Every estimate includes a full material list and assembly recommendation from our sound specialists — DIY-friendly if you prefer to build it yourself.
Sample estimate
Better Floor Soundproofing Assembly
Recommended for wood-framed floors between residential units where footfall impact is the primary complaint.
Project area
200 sq. ft.
Estimated performance
IIC 60–65
Estimated material cost
$2,510
Fundamentals
Core principles of soundproofing
Every assembly on this page combines these five principles. The tier you choose is really a decision about how many of them to layer in.
- 01
Mass
Heavier layers resist and obstruct sound passage.
- 02
Absorption
Insulation reduces and absorbs cavity resonance.
- 03
Damping
Green Glue converts vibration into trace heat, diminishing the wave.
- 04
Decoupling
Clips, channels, and separation break direct vibration transfer.
- 05
Sealing
Airtight gaps, seams, outlets, and perimeters block sneak paths.
Let’s get in touch
Not sure which assembly is right for your space?
Share your room dimensions and how the space is used — we’ll come back with a full material list, an assembly recommendation, and a realistic cost range. Free by phone.