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Cork Underlayment - 1/8" (3mm) - 150 sq.ft. box

Made in PortugalHidden-35713mm (1/8")

~~$0.79~~ $0.49 per sq.ft.$73.50 covers up to 150 sq.ft.

Price: ~~$118.50~~ $73.50 / box (Save: $45.00)
_{One box covers up to 150.00 sq. ft.}

Summer Project SaleSale ends in 26 daysSale pricing ends August 5 at 11 PM PT.

3mm Cork Underlayment – 220 kg/m³ Density – 150 sq. ft.

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

Order a Sample

Bundle and save: buy 2 or more accessories (trim, underlayment, adhesive, finish) and an extra 10% comes off those items automatically in the cart.

Free shipping over $2,500

In stock. Most orders ship within 2 business days.
Up to 90 days returns on unused product
Pay over time with Affirm or Afterpay. Options shown at checkout.

Description

Overview

3mm Cork Underlayment – 220 kg/m³ Density – 150 sq. ft. Coverage

Our 3mm cork underlayment is the lightest option in the collection, yet it delivers outstanding performance in comfort, insulation, and sound control. Designed for installation beneath laminate, cork, bamboo, hardwood, or engineered wood flooring, this slim layer helps preserve warmth and adds a subtle cushion underfoot.

Each sheet measures 24” x 36” (2 ft x 3 ft) and comes pre-cut for easy handling. Packaged 25 sheets per carton, a single box covers 150 sq. ft. Made entirely from natural agglomerated cork and bonded with water-based adhesives, this product is free from formaldehyde and toxins, recyclable, and environmentally responsible.

Why Choose 3mm Cork Underlayment?

Acoustic Comfort – Cork’s honeycomb-like structure (around 40 million cells per cubic centimeter) naturally dampens sound, offering superior noise control compared to standard foam underlays.
Thermal Efficiency – Acts as a barrier against heat transfer, helping rooms retain warmth in cooler months and maintain comfort year-round.
Moisture Protection – Naturally infused with suberin, cork resists mold, mildew, and bacteria growth, making it a healthier choice for homes and commercial spaces.
Added Comfort – The elastic quality of cork provides a gentle cushioning effect that eases stress on feet and joints.
Sustainable Material – Harvested from the bark of cork oak trees without harming them, cork is a renewable resource with each tree yielding for up to two centuries.

Product Specifications

Composition: 100% Natural Agglomerated Cork
Thickness: 3mm (approx. 1/8”)
Sheet Size: 24” x 36”
Carton Coverage: 150 sq. ft.
Manufactured in: Portugal
Eco-Friendly: Formaldehyde-free, recyclable, water-based binders
Acoustic Ratings (field tested):

Applications

Excellent underlayment for laminate, cork, bamboo, solid hardwood, and engineered wood
Suitable for both floating and glue-down floor systems
Compatible with ceramic tile and stone installations (with proper method)
Enhances performance of radiant floor heating systems

warm cork underlay

Info & Guides

Additional information

Board Thickness	3mm (1/8")
Board Length	915mm (36 Inch)
Board Width	610mm (24 Inch)
Core Type	Cork
Impact Noise Reduction	IIC 39 / STC 40
IIC	IIC 39
Brand	Forna
Country of origin	Portugal
Pieces in Package	25
Country of Origin	Portugal
Weight (packing)	25 lbs
Dimensions (packing)	37 × 25 × 4 in

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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: 150 sq. ft. per box
Pieces: 25

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.