UnderBlockâ„¢ Rubber Floor Underlayment
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UnderBlockâ„¢ Rubber Flooring Underlayment
It's a bird! It's a plane! No... it's UnderBlock! UnderBlock is a recycled rubber underlayment that will give a wedgie to footfall noise and a giant uppercut to airborne noise passing through your floor-ceiling assembly. Upgrade your floor soundproofing with a cost-effective, long-lasting, and easy to install underlayment!
Features
- Rubber underlayment excels at reducing impact noise, airborne noise, and vibration
- 90% recycled rubber
- ASTM tested to an IIC of 51 to 67 depending on the floor-ceiling assembly (data below)
- Compatible with just about any floor finish and assembly
- LEED eligible recycled materials
- Easy roll out installation
- Proudly made in the USA
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Specs
Specs
| Dimensions | 4' x 50 (2mm) 4' x 30' (5mm) 4' x 15' (10mm and 12mm) |
| Thickness | 2mm, 5mm, 10mm, 12mm |
| Weight | 75 lbs (2mm) 100 lbs (5mm) 100 lbs (10mm) 120 lbs (12mm) |
| Color | Black |
| LEED Certified | Eligible (90% recycled, made in USA) |
| R-value | 2.0 per inch |
| Installation | Adhered to subfloor using Mapei Ultrabond Sport PU 1K |
Material Testing
Material Testing
6" Concrete Slab - Lab Testing
| Finished Floor | Ceiling | STC Rating* | IIC Rating* | HIIC Rating* |
| Click-Lock LVT | None | 50-53 | 56-57 | 59-66 |
| Click-Lock LVT | Wire Hung, R-13, 5/8" Gypsum | 60-61 | 65-67 | 69-77 |
| Engineered Wood | None | 50-55 | 54-55 | 56-64 |
| Engineered Wood | Wire Hung, R-13, 5/8" Gypsum | 60-62 | 64-66 | 66-76 |
| Ceramic Tile (2mm only) | None | 52 | 50 | 50 |
| Ceramic Tile (2mm only) | Wire Hung, R-13, 5/8" Gypsum | 61 | 59 | 58 |
*Exact STC, IIC, and HIIC rating depends on UnderBlock thickness (2mm, 5mm, 10mm, or 12mm).
8" Concrete Slab - Lab Testing
| Finished Floor | Ceiling | STC Rating* | IIC Rating* | HIIC Rating* |
| Click-Lock LVT | None | 53-56 | 55-61 | 55-69 |
| Click-Lock LVT | Wire Hung, R-13, 5/8" Gypsum | 62-63 | 66-69 | 68-78 |
| Engineered Wood | None | 55-56 | 57-58 | 58-65 |
| Engineered Wood | Wire Hung, R-13, 5/8" Gypsum | 62-63 | 66-67 | 68-76 |
| Ceramic Tile (2mm only) | None | 55 | 51 | 50 |
| Ceramic Tile (2mm only) | Wire Hung, R-13, 5/8" Gypsum | 61 | 60 | 60 |
*Exact STC, IIC, and HIIC rating depends on UnderBlock thickness (2mm, 5mm, 10mm, or 12mm).
18" Open Web Truss - Lab Testing
| Finished Floor | Ceiling | STC Rating* | IIC Rating* | HIIC Rating* |
| Click-Lock LVT | R-13, RC Deluxe, 5/8" Gypsum | 61-62 | 56-60 | 67-73 |
| Engineered Wood | R-13, RC Deluxe, 5/8" Gypsum | 60-61 | 57-60 | 63-71 |
| Ceramic Tile (2mm only) | R-13, RC Deluxe, 5/8" Gypsum | 61 | 55 | 58 |
*Exact STC, IIC, and HIIC rating depends on UnderBlock thickness (2mm, 5mm, 10mm, or 12mm).
2x10 Joists w/ USG Levelrock 2500 over 3/4" OSB - Lab Testing
| Finished Floor | Ceiling | STC Rating* | IIC Rating* | HIIC Rating* |
| Click-Lock LVT | R-13, RC Deluxe, 5/8" Gypsum | 59-60 | 55-59 | 57-68 |
| Engineered Wood | R-13, RC Deluxe, 5/8" Gypsum | 59-60 | 56-60 | 60-66 |
| Ceramic Tile (2mm only) | R-13, RC Deluxe, 5/8" Gypsum | 61 | 50 | 50 |
*Exact STC, IIC, and HIIC rating depends on UnderBlock thickness (2mm, 5mm, 10mm, or 12mm).
If you have questions on your floor-ceiling assembly, please contact us at 1-800-679-8511.
| Tested Properties | Testing Method | Performance |
|---|---|---|
| Tensile Strength | ASTM D 412 | 90 PSI (2mm, 5mm) |
| Compression Resistance | ASTM D 3575 ASTM D 3676 | 65 lbs / cubic foot |
| Water Vapor Transmission | ASTM E96 | 4.8 g/m2/24hr |
| Durometer | ASTM D2240 | 40 +/- 5 (2mm) |
| Flammability | FF 1-70 CPSC | Passed |
| VOCs | CDPH v1.2 | <0.5mg/m3 |
| Clean Air Certification | CDPH 01350 | Pass |
Installation Instructions
Installation Instructions
- Roll out UnderBlock to cover the subfloor. Use Mapei Ultrabond Sport Rubber Flooring Adhesive as needed.
- Use a metal straight edge to make any cuts with a sharp utility knife.
- Leave a 1/8" gap between UnderBlock and any obstacles (walls, columns, posts, drains, pipes, etc). Fill this gap with acoustic sealant caulk.
- For perimeter walls, you can run UnderBlock directly to or under the wall instead of leaving the 1/8" gap and sealing it.
- Roll out the UnderBlockâ„¢ in rows, keeping the factory seams tight and flush. If the seams are flush, acoustic sealant is not needed. Joints and seams can be taped if desired.
- Install your chosen flooring on top of UnderBlock rubber flooring underlayment. For ceramic tile or sheet vinyl flooring, use 2mm UnderBlockâ„¢ or install an additional wood layer over thicker UnderBlockâ„¢ rubber underlayment.
If you have any questions about your type of flooring for your project, call us and we can walk you through it!
- Floating floors do not require additional adhesive. They just lay on top of UnderBlock.
- Mechanically fastened floors (nail down) should have a subfloor glued to the top of UnderBlock. DO NOT NAIL THROUGH RUBBER UNDERLAYMENT! Use our recommended Mapei rubber adhesive when required.
- Glue down floors should use whatever adhesive is recommended by the flooring manufacturer that is compatible with attaching to rubber.
- When installing under carpet, UnderBlock should be cover the subfloor completely, leaving a 1/8" gap near obstacles to be filled with acoustical sealant. Tacking strips can be glued down to UnderBlock using our recommended rubber adhesive. Carpet padding is optional.
Common Product Uses
Common Product Uses
- Homes, apartments, home studios, recording studios, condos, hotels, conference rooms, offices, music practice rooms, band rooms, houses of worship, hospitals, malls, retail stores, theaters, schools, restaurants, and bars
- If you've got a floor, install UnderBlock to soundproof it. UnderBlock rubber underlayment stops all impact noise while also blocking airborne noise.
- For heated floors, select a thinner version of UnderBlock for impact noise reduction with minimal thermal resistance.
- Soundproofing the floor is one way to soundproof a floor-ceiling assembly. Alternatively, you can soundproof the ceiling side.
- For a complete project, soundproofing your walls, soundproofing your doors, and soundproofing your windows are necessary for building a fully soundproof room.
Resources
Installation Guides
Spec Sheets
Architect CSI Specs
