Serenity 9mm Acoustic Underlayment Roll
The Serenity 9mm Underlay Roll adds mass and thickness over the 6 mm sheet — the balanced pick when a floor project needs more impact isolation but still has to keep finished-floor buildup in check. Each 4' × 25' roll covers 100 sq ft and pairs cleanly with LVT, engineered wood, and floating hardwood floors.
- 100 sq ft per roll: 4 ft × 25 ft continuous roll — sizes cleanly for typical bedroom, living-room, and home-office layouts.
- 9 mm build-up: Balanced thickness that adds real acoustic mass without pushing transition heights into problem territory.
- 1.1 lb / sq ft mass: More loaded mass than the 6 mm sheet — better mid- and low-frequency airborne performance across the underlayment layer.
- R-0.30 thermal: Slight thermal benefit — noticeable underfoot over slab-on-grade or cold subfloors.
Online orders up to 500 rolls. For anything larger, call (415) 864-4440 and we'll price the project with you.
Freight shipments include a $100 freight-and-handling charge.
9mm Roll Specifications
- Application
- Floating & glued-down finished floor decoupling
- Roll size
- 4 ft × 25 ft (100 sq ft)
- Thickness
- 9 mm
- Mass
- 1.1 lb / sq ft
- Thermal resistance
- R-0.30
- Composition
- Recycled rubber composite
- Compatible finishes
- LVT, engineered wood, laminate, floating floor
9mm Roll Project Calculator
Enter your floor square footage — we'll estimate the number of 9mm Roll rolls needed (each roll covers 100 sq ft).
Coverage is 100 sq ft per roll. Add a 10% buffer for seams, cuts, and re-work.
IIC Gauge
Compare how the 9mm Roll performs across assembly tiers. Select an assembly below to see the resulting IIC score.
Serenity 9mm + double subfloor with Green Glue between layers.
- STC 30-39: Loud speech clearly audible next room.
- STC 40-49: Loud speech muffled — normal residential wall.
- STC 50-59: Loud speech barely audible; suitable for offices & multi-family.
- STC 60+: Approaches studio-grade isolation.
Applicable Assemblies
See where the 9mm Roll fits — from budget baseline to studio-grade isolation.
Better — Serenity 9mm + Double Subfloor + Green Glue
Structural subfloor · Serenity 9mm underlay · plywood layer with Green Glue between layers · finished floor · perimeter acoustic sealant.
Good — Serenity 9mm + Finished Floor
Structural subfloor · Serenity 9mm underlay · finished floor · perimeter acoustic sealant.
