Premium European cork underlament

Cork sheets and cork rolls for commercial and residential applications are a natural choice for sound control. Cork Direct underlayment is an effective, economical
means to provide an acoustic barrier for flooring materials. Environmentally sound and quick and easy to install, Cork Direct underlayment will not deteriorate over years of use.

Cork Direct underlayment is recommended for sound reduction and stress crack protection. It has been independently tested using ASTM standards for acoustic values. All Cork Direct brand cork underlayment is made entirely of premium quality European cork, finished and packaged in the U.S.

All Cork Direct underlayment, up to container quantities,is available for time critical jobsite delivery.

Cork Direct brand cork underlayments with densities of 11.7 lb/ft3 – 12.5 lb/ft3 provide significant acoustic insulation.  See technical information below.

Cork Underlayment Prices

Quarter-Inch Rolls

Limited Time Special

1/4″ x 4′ x 50′
200 sq. ft. per roll
1 – 5 rolls: Regularly $130.00 per roll

NOW $118.00 ($0.59 sqft)!

Quarter-Inch Sheet

Limited Time Special

1/4″ x 24″ x 36″
6 sq. ft. per sheet
Box of 50 sheets (300 sqft)
Regularly $195.00

NOW $165.00 ($0.55 sqft)!

Box of 10 sheets (60 sqft)
Regularly $54.00

NOW $45.00 ($0.75 sqft)!

Half-Inch Sheet

1/2″ x 24″ x 36″
6 sq. ft. per sheet
Box of 25 sheets (150 sqft)

$195.00 ($1.30 sq. ft.)

Eighth-inch Roll

1/8″ x 4′ x 50′
200 sq. ft. per roll
1 – 5 rolls: $110.00($0.55 sq. ft.)

Significant discounts on larger quantities: ask for a quote.

Get a shipping quote to your zip code on cork underlayment.

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Cork Direct Underlayment Technical Specifications

Description: Composition cork underlayment for commercial and residential applications.
Sizes: Available in sheets and rolls of various sizes and thicknesses.
Binder: Resin of Polyurethane
Base: Composition cork granules sizes 1 – 3
Density: 11.7 lb/ft3 – 12.5 lb/ft3
Tensile strength: 5 – 8 Kgs/cm2
Recovery: 75%
Flexibility F5: Pass
Disintegration: None after 3 hours immersion in boiling water.
Thermal Insulation: 0.042 Kcal/m3 h0 C

Acoustical Ratings:

Ceramic Finish Ceramic Finish Wood Finish Wood Finish
Concrete Slab 8″ 58 60 56 62
Concrete Slab 6″ 53 58 54 59
Concrete Slab 4″ & Steel Deck 60 64 60 65
Wood Joist Construction 54 59 54 60

Fire Behavior:  The underlayment is a fire inhibitor which neither spreads flame nor releases toxic gases on combustion.
Dimensional Tolerance: Length & Width: +/- 0.5mm  Thickness: +/- 0.2mm

Cork Direct Underlayment Installation Instructions

Getting Help
Please read these instructions before beginning an installation. If you have any questions, or  if you feel you need more information, please call technical support at (800) 344-CORK, or email: .

Surface Preparation.
Surfaces must be clean, dry and smooth, free of voids, projections, loose materials, oil, grease, sealers and other contaminants.  Surface areas which require patching or leveling should be repaired with Portland based cement materials.

Maximum floor variation is 1/8” in 10 feet.

Creating an Isolation Barrier
Unroll the cork underlayment and cut sections approximately 2” wide from the roll. Adhere the 2” sections around perimeter of the entire floor with Cork Direct Fortane Urethane underlayment adhesive, to form an effective isolation barrier.  Never mechanically fasten the isolation barrier with screws, nails or staples. Fasteners of any kind will transmit sound and severely diminish the acoustical values of the barrier.

Installing Underlayment in Rolls
Unroll the cork underlayment and cut it to the desired length. Lay it loosely over area to be installed, with both ends of the roll curling down towards the subfloor. If the end curls up, flip material over. Abut the cork directly against the isolation barrier already installed.

Pull the loosely laid material back at least half the length of the roll. Using a 3/3 2” x  3/3 2” x 3/3 2” v-notch trowel, apply Cork Direct Fortane Urethane underlayment adhesive at a spread rate of 100 square feet per gallon. Gently return the pulled back material and roll in both directions with a 100 lb. roller.

Repeat this procedure for the other half of the roll. Cover the entire floor making sure all joints are butted together tightly. Allow the cork adhesive to take set firmly before installing hardwood or ceramic tile.

Installing  CorkDirect Underlayment Sheets

Follow instructions as above, but without concern for curl, as the sheets will lay flat.

Wood flooring installation

  1. Follow industry standards and the wood floor manufacturer’s recommendations for subfloor moisture content, design, layout and application of wood flooring materials.
  2. Before the wood floor is installed, trim the isolation barrier 1/4” below the finished floor surface.
  3. Install the wood floor with a recommended  adhesive over the Cork Direct underlayment.

Ceramic Tile flooring installation

Install ceramic tile according to applicable ANSI standards and manufacturers’ instructions using Hydroment Single-Flex, Hydroment PM, or Tile-Mate Thin-Set Mortars mixed with #425 Multi-Purpose Acrylic Latex Admixture or #447 Flex-a-lastic Admixture.

  1. Before the tile floor is installed, trim the isolation barrier 1/4” below the finished floor surface.
  2. Caulk the trimmed areas with a bead of acoustical sealant, flush to the finished floor.
  3. Install the tile floor.

Carpet or Laminate Flooring installation
Lay cork underlayment loosely over the area to be installed. Before installing carpet or laminate flooring, trim the isolation barrier 1/4” below the finished floor surface.

Cork Underlayment Warranty

Cork Direct warrants its products to meet all published specifications and to be free of any and all manufacturing defects. No other warranty is expressed or implied.

Want More Information?

Questions, additional data or installation information email us at: Or call us toll free at 1-800-344-2675 (CORK)