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

Resources 

Material Testing

For jobs with specific IIC requirements, contact us for to discuss your specific floor-ceiling assembly.

 Impact Insulation Class

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