3.5mm Dura-Son MB Underlayment with Moisture Barrier
Dura-Son MB pairs the acoustic performance of Dura-Son with a factory-laminated moisture barrier — the go-to spec when laying laminate or engineered hardwood over concrete slabs. IIC 74 impact isolation without a separate poly layer.
- IIC 74: Lab-rated impact isolation in tested Dura floor assemblies.
- 3.5 mm recycled rubber: Dense recycled-rubber core delivers acoustic mass and long-term resilience.
- Built: Built-in moisture barrier protection
- Certified for radiant: Certified for radiant-heat flooring
- Residential + commercial: Rated for both residential and commercial traffic loads.
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.
3.5mm Dura-Son MB Specifications
- Application
- Installs with Laminate and engineered hardwood floors over concrete
- Thickness
- 3.5 mm
- Acoustic performance
- IIC 74
- Composition
- Recycled rubber composite
- Traffic rating
- Residential & commercial
- Roll size
- 54" × 48 ft
- Coverage per roll
- 216 sq ft
- Roll weight
- 60 lb
3.5mm Dura-Son MB Project Calculator
Enter your floor square footage — we'll estimate the number of 3.5mm Dura-Son MB rolls needed (each roll covers 216 sq ft).
Roll coverage varies by SKU — send us your room dimensions and we'll confirm rolls needed with a 10% waste buffer.
IIC Gauge
Compare how the 3.5mm Dura-Son MB performs across assembly tiers. Select an assembly below to see the resulting IIC score.
Dura 3.5mm Dura-Son MB + 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.
How 3.5mm Dura-Son MB compares
| Model | Thickness | IIC | Best For |
|---|---|---|---|
| 2mm DuraPad | 2 mm | 72 | Luxury Vinyl Tile (LVT), Luxury Vinyl Plank (LVP), and Carpet Tile |
| 3mm DuraQuiet | 3 mm | 74 | Tile, ceramic, natural stone, carpet tile, and vinyl flooring |
| 3mm DuraLux Grip | 3 mm | 74 | Area rugs and runners |
| 3.5mm Dura-Son | 3.5 mm | 74 | Laminate and engineered hardwood floors |
| 3.5mm Dura-Son MBthis | 3.5 mm | 74 | Laminate and engineered hardwood floors over concrete |
| 5mm Protector | 5 mm | 81 | High-traffic carpet, luxury vinyl plank (LVP), and carpet tile |
| 6mm DuraCushion | 6 mm | 86 | Carpet, LVP, engineered hardwood, and floating floor systems |
| 7mm DuraLux Comfort | 7 mm | 85 | Premium area rugs, runners, and LVP |
| 8mm DuraCoustic | 8 mm | 92 | Engineered hardwood, laminate, ceramic, natural stone, carpet tile, vinyl, and carpet |
| 10mm Super Dura | 10 mm | 94 | Any hard or soft finished floor over wood-framed or concrete subfloors |
Applicable Assemblies
See where the 3.5mm Dura-Son MB fits — from budget baseline to studio-grade isolation.
Better — Dura 3.5mm Dura-Son MB + Double Subfloor + Green Glue
Structural subfloor · Dura 3.5mm Dura-Son MB underlay · plywood layer with Green Glue between layers · finished floor · perimeter acoustic sealant.
Good — Dura 3.5mm Dura-Son MB + Finished Floor
Structural subfloor · Dura 3.5mm Dura-Son MB underlay · finished floor · perimeter acoustic sealant.
