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underblock rubber underlayment

UnderBlock™ Rubber Floor Underlayment

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In Stock. This product ships in 1 business day. Custom lengths or 15+ rolls ship in 1 week. Expedites available.

Bulk discounts available. Save per roll at 5, 10 and 15 rolls.
$189.99
Covers 0 SF
$189.99

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) 
 R-value   2.0 per inch

 

 

Resources

 Spec Sheet 

 UnderBlock™ Product Sheet 
 Install Guide

 UnderBlock™ Install Guide 
 Architect CSI Specs 

 UnderBlock™ CSI Spec

 

 

Material Testing

6" Concrete Slab - Lab Testing

 Finished Floor 

 Ceiling 

 STC Rating 

 IIC Rating 

 HIIC Rating 
 Click-Lock LVT   None   Up to 53   Up to 57   Up to 66 
 Click-Lock LVT   Wire Hung, R-13, 5/8" Gypsum Up to 61  Up to 67   Up to 77 
 Engineered Wood   None  Up to 55    Up to 55    Up to 64 
 Engineered Wood   Wire Hung, R-13, 5/8" Gypsum  Up to 62   Up to 66   Up to 76 
 Ceramic Tile (2mm only)   None 52 50 50
 Ceramic Tile (2mm only)  Wire Hung, R-13, 5/8" Gypsum  61  59  58

 

8" Concrete Slab - Lab Testing

 Finished Floor 

 Ceiling 

 STC Rating 

 IIC Rating 

 HIIC Rating 
 Click-Lock LVT   None   Up to 56   Up to 61   Up to 69 
 Click-Lock LVT   Wire Hung, R-13, 5/8" Gypsum Up to 63  Up to 69   Up to 78 
 Engineered Wood   None  Up to 56    Up to 58    Up to 65 
 Engineered Wood   Wire Hung, R-13, 5/8" Gypsum  Up to 63   Up to 67   Up to 76 
 Ceramic Tile (2mm only)   None 52 50 50
 Ceramic Tile (2mm only)  Wire Hung, R-13, 5/8" Gypsum  61  59  58

 

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   Up to 62   Up to 60   Up to 73 
 Engineered Wood   R-13, RC Deluxe, 5/8" Gypsum   Up to 61   Up to 60   Up to 71 
 Ceramic Tile (2mm only)   R-13, RC Deluxe, 5/8" Gypsum  61  55  58

 

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   Up to 60   Up to 59   Up to 68 
 Engineered Wood   R-13, RC Deluxe, 5/8" Gypsum   Up to 60   Up to 60   Up to 66 
 Ceramic Tile (2mm only)   R-13, RC Deluxe, 5/8" Gypsum  61  50  50 

If you have questions on your floor-ceiling assembly, please contact us at 1-800-679-8511.

 

 

 

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.
  • 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

  • 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.

 

Contact us if you have any questions!