UnderBlock™ HD Rubber Flooring Underlayment
UnderBlock™ HD is the underlayment of choice for multi-family, hotels, and other large projects with high IIC requirements. Because most flooring (including many tiles) can be installed directly on top, save significant time during install while hitting 60+ IIC in many constructions. Contact us if you have questions about your specific assembly!
Features
- Subflooring / underlayment for reducing impact noise, airborne noise, and vibration
- 100% recycled rubber
- Most flooring can lay directly on top (including tile)
- Best solution for maximum IIC and STC
- Commonly specified and used in multi-family
- Easy roll out installation
- Proudly made in the USA
Specs
Dimensions |
4’ x 15’ (3/8”), 4’ x 13’ (1/2”) |
Thickness |
3/8" or 1/2" |
Weight |
100 lbs (3/8) or 120 lbs (1/2") |
Color |
Black |
R-value |
2 per inch |
Resources
Material Testing
For jobs with specific IIC requirements, contact us for to discuss your specific floor-ceiling assembly.
Impact Insulation Class
Roll Thickness |
6" Concrete IIC (LVT, No Ceiling) |
8" Concrete IIC (LVT, No Ceiling) |
6" Concrete IIC (Wood, No Ceiling)
|
8" Concrete IIC (Wood, No Ceiling)
|
3/8" |
60 |
63 |
61 |
67 |
1/2" |
58 |
64 |
65 |
68
|
Installation Instructions
- Roll out UnderBlock™ HD to cover the subfloor. Adhesive is optional. UnderBlock™ HD is heavy and will not move around.
- Use a metal straight edge to make any cuts with a sharp utility knife.
- Leave a 1/8" gap between UnderBlock™ HD and any obstacles (walls, columns, posts, drains, pipes, etc). Fill this gap with acoustic sealant caulk.
- For perimeter walls, you can run UnderBlock™ HD directly to or under the wall instead of leaving the 1/8" gap and sealing it.
- Roll out the UnderBlock™ HD 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™ HD rubber flooring 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™ HD.
- Mechanically fastened floors (nail down) should have a subfloor glued to the top of UnderBlock™ HD. Use our recommended 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™ HD 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
- Multi-family condos, hotels, apartments, recording studios, conference rooms, commercial buildings, band rooms, houses of worship, theaters, schools, restaurants
- UnderBlock HD delivers the best possible performance for a soundproof floor. It's the preferred choice for multi-family.
- Meets building code for 6" or 8" concrete, even without a finished ceiling below.
- Lay most flooring directly on top, including most tiles.
- Consider our standard sizes of Underblock™ Rubber Floor Underlayment