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Cork Underlayment – 3mm (1/8″) – 300 sq.ft.

~~$0.79~~ $0.49 per sq.ft.$147.00 covers up to 300 sq.ft.

Price: ~~$237.00~~ $147.00 / box (Save: $90.00)
_{One box covers up to 300.00 sq. ft.}

Summer Stock SaleSale ends in 17 daysSale pricing ends July 5 at 11 PM PT.

LIMITED PROMO: This product does not qualify for volume discounts.

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Description

3mm Cork Underlayment – 300 sq. ft. Carton

Forna’s 3mm cork underlayment is our thinnest option, offering reliable comfort, sound control, and thermal protection beneath your flooring. Designed for use under laminate, cork, bamboo, hardwood, or engineered wood, it creates a warmer, quieter, and more comfortable living space.

Each carton contains 50 pre-cut sheets measuring 24” x 36” (2 ft x 3 ft), covering 300 sq. ft. in total. Weighing about 46 lbs per box, the underlay is made from 100% agglomerated cork and bonded with water-based adhesives—completely free of formaldehyde and toxins.

Key Benefits

Noise Reduction: Cork’s cellular structure absorbs airborne and impact sound, outperforming most foam underlays.
Thermal Insulation: Helps maintain consistent room temperatures while improving the efficiency of radiant heating systems.
Moisture Resistance: Naturally resistant to mold and mildew thanks to cork’s suberin content.
Comfortable Cushioning: Provides a softer, more supportive surface underfoot.
Eco-Friendly: Harvested sustainably from cork oak bark without harming the tree, making it a renewable and recyclable choice.

Specifications

Thickness: 3mm (approx. 1/8”)
Sheet Size: 24” x 36”
Coverage: 300 sq. ft. per carton (50 sheets)
Weight: ~46 lbs per carton
Density: 220 kg/m³
Origin: Portugal
Acoustic Ratings (field tested):

warm cork underlay Info & Guides

Additional information

Weight (packing)	50 lbs
Dimensions (packing)	37 × 25 × 7 in
Brand	Forna
IIC	IIC 39
Impact Noise Reduction	IIC 39 / STC 40
Board Length	915mm (36 Inch)
Board Width	610mm (24 Inch)
Board Thickness	3mm (1/8")
Core Type	Cork
Pieces in Package	50
Country of Origin	Portugal

Details

Product details

Best use

Kitchen, Bedroom, Living room, Basement. Keep cork out of standing-water conditions and use mats at exterior doors and heavy splash zones.

Box specs

Install: Project dependent
Coverage: 300 sq. ft. per box
Pieces: 50

Install and care

Acclimate cartons, inspect planks, leave expansion space, and follow the click-lock installation guide.

Sweep or vacuum grit, damp mop with cork-safe cleaner, and protect chair legs with felt pads.

Warranty details are listed in the product specifications.

Shipping and returns

Most in-stock orders ship within two business days. Shipping cost and delivery options are calculated during checkout.

Returns are coordinated through the service team, with return shipping handled under the published policy.

Shipping help Return policy

Choose 3mm cork underlayment before buying

3mm cork underlayment is a 1/8 inch acoustic and thermal underlay for low-profile acoustic layer needs, finished height limits, laminate, vinyl, engineered hardwood, tile, and light sound-control projects. Compare thickness, subfloor needs, finished height, and room sound goals before ordering full boxes.

Confirm the full floor assembly before underlayment checkout

Direct underlayment shoppers need the finished floor approval, sample feel, acoustic target, finished height, moisture limits, and project support checked before they order boxes.

Sample cork thickness and density first Check material density, thickness, finished height, and feel before choosing full underlayment boxes. Finished floor approval path Confirm hardwood, laminate, vinyl, tile, or cork flooring instructions allow the selected underlay layer. Acoustic target and finished height Match 3mm, 6mm, or 12mm cork to sound goals, door clearance, transitions, and subfloor conditions. Ask before buying underlayment Send floor type, subfloor, moisture concerns, height limits, acoustic target, and project timing for help.

Match 3mm cork underlayment to the finished floor

Under hardwood and engineered wood Confirm the finished floor manufacturer allows cork underlay, then match thickness to height, sound, and subfloor needs. Under laminate, vinyl, tile or cork Check installation instructions, adhesive or floating system rules, moisture limits, and finished height before ordering. Compare 3mm, 6mm and 12mm cork underlay Choose low-profile, balanced acoustic, or maximum impact-sound support before buying full boxes. Shop cork underlayment Compare 3mm, 6mm, and 12mm cork underlay by sound goal, floor type, and finished height. Order underlayment samples Check thickness, density, finished height, and project fit before buying full boxes. Ask an underlayment specialist Get help matching cork underlay to hardwood, laminate, vinyl, tile, cork, and acoustic requirements.

Product buying questions

What is 3mm cork underlayment best for?

3mm cork underlayment is an acoustic and thermal underlay for flooring projects where low-profile acoustic layer needs, finished height limits, laminate, vinyl, engineered hardwood, tile, and light sound-control projects matter under hardwood, laminate, vinyl, tile, or cork floors.

Should I choose 3mm cork underlayment for sound control?

Cork underlayment can help with impact sound and thermal comfort, but the right thickness depends on assembly, finished floor height, subfloor, building requirements, and the flooring manufacturer instructions.

Can 3mm cork underlayment go under hardwood, laminate, vinyl, tile, or cork?

Often yes, when the flooring manufacturer allows an underlay layer and the substrate, adhesive or floating-floor system, moisture limits, and finished height are confirmed before installation.