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UnderBlock™ Rubber Floor Underlayment

Substantially increase IIC and STC ratings of any floor-ceiling assembly with UnderBlock. Stop footsteps and easily hit building code requirements!

$114.99
Availability:
This product ships in 1 business day. Custom lengths or large orders ship in 7-10 business days.

UnderBlock™ 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

 

Specs

 Dimensions   4' x 50 (2mm), 4' x 25' (5mm), 4' x 15' (10mm and 12mm) 
 Thickness   2mm, 5mm, 10mm, 12mm 
 Weight   75 lbs (2mm), 85 lbs (5mm), 100 lbs (10mm), 120 lbs (12mm) 
 Color   Black 
 LEED Certified   Eligible (90% recycled, made in USA) 

 

 

Resources

 Spec Sheet 

 UnderBlock™ Product Sheet 

 Architect CSI Specs 

 UnderBlock™ CSI Spec

 

 

Material Testing

6" Concrete Slab - IIC Testing

 Underlayment 

 Finished Floor 

 Ceiling 

 IIC Rating 

 2mm UnderBlock   Click-Lock LVT   None   51 
 2mm UnderBlock   Engineered Wood   None   55 
 2mm UnderBlock   Click-Lock LVT   Wire Hung, R-13, 1 Layer Drywall (Type X)   66 
 2mm UnderBlock   Engineered Wood   Wire Hung, R-13, 1 Layer Drywall (Type X)   64 
 5mm UnderBlock   Click-Lock LVT   None   54 
 5mm UnderBlock   Engineered Wood   None   55 
 5mm UnderBlock   Click-Lock LVT   Wire Hung, R-13, 1 Layer Drywall (Type X)   66 
 5mm UnderBlock   Engineered Wood   Wire Hung, R-13, 1 Layer Drywall (Type X)   64 
 10mm UnderBlock   Click-Lock LVT   None   55 
 10mm UnderBlock   Engineered Wood   None   55 
 10mm UnderBlock   Click-Lock LVT   Wire Hung, R-13, 1 Layer Drywall (Type X)   67 
 10mm UnderBlock   Engineered Wood   Wire Hung, R-13, 1 Layer Drywall (Type X)   66 
 12mm UnderBlock   Click-Lock LVT   None   56 
 12mm UnderBlock   Engineered Wood   None   55 
 12mm UnderBlock   Click-Lock LVT   Wire Hung, R-13, 1 Layer Drywall (Type X)   67 
 12mm UnderBlock   Engineered Wood   Wire Hung, R-13, 1 Layer Drywall (Type X)   66 
 2mm UnderBlock   Ceramic Tile   Wire Hung, R-13, 1 Layer Drywall (Type X)   59 

 

18" Open Web Truss - IIC Testing

 Underlayment 

 Finished Floor 

 Ceiling 

 IIC Rating 

 2mm UnderBlock   Click-Lock LVT   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   53 
 2mm UnderBlock   Engineered Wood   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   55 
 5mm UnderBlock   Click-Lock LVT   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   54 
 5mm UnderBlock   Engineered Wood   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   55 
 10mm UnderBlock   Click-Lock LVT   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   55 
 10mm UnderBlock   Engineered Wood   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   56 
 12mm UnderBlock   Click-Lock LVT   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   55 
 12mm UnderBlock   Engineered Wood   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   56 
 2mm UnderBlock   Ceramic Tile   R-13, RC Deluxe (16" oc), 1 Layer Drywall (Type C)   52 

For projects with specific IIC requirements, reach out to us for a floor-ceiling assembly evaluation.

 

 

 

Installation Instructions

  • Roll out UnderBlock to cover the subfloor. Using an adhesive is optional.
  • 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 UnderBlock™ 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, upgrade to UnderBlock™ HD or use an additional wood layer over the UnderBlock 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 rubber adhesive when required.
  • Glue down floors should use whatever adhesive is recommended by the flooring manufacturer that is compatible with attaching to rubber.


 

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, UnderBlock will make it a soundproof floor. 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.
  • The floor's soundproofing should be considered equally along with soundproofing walls and ceiling sound insulation when deciding how to soundproof a room.
  • To completely treat all 6 surfaces in thee room, sound proof doors and sound proof windows will be needed for any rough openings.

 

Contact us if you have any questions!