Compare thickness and pack coverage. Check the complete floor assembly. Plan the layer beneath your finished floor.
Thickness is one decision. Floor compatibility, finished height and installation matter too.
Start here when a thin cork layer fits the specified floor assembly. Choose between the available pack sizes.
Before you chooseA thinner layer does not remove the need to check substrate moisture, flatness and the floor’s underlayment requirements.
A thicker cork layer to consider where the finished floor and overall assembly allow it. Account for doors and transitions.
Before you chooseDo not add underlayment beneath a cork-backed or floating floor unless the manufacturer approves the complete assembly.
Compare the thickest option with your project’s specified assembly, acoustic requirements and available finished height.
Before you chooseMore thickness alone does not guarantee a required acoustic rating. Condo and strata approval depends on the tested complete assembly.
Compare the system first. Then check the selected product.
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| Option | Thickness | Pack coverage | Before choosing |
|---|---|---|---|
| 3mm · larger pack | 3mm | 300 sq. ft. | Floor-system approval |
| 3mm · smaller pack | 3mm | 150 sq. ft. | Floor-system approval |
| 6mm | 6mm | 150 sq. ft. | Finished height & compatibility |
| 12mm | 12mm | 102 sq. ft. | Specified assembly & approval |
Acoustic ratings describe tested assemblies. A cork layer is not a substitute for a specified moisture barrier or an approved installation system.
Use the instructions for your chosen material and assembly.
Installation guide
Use this guide to match cork underlayment thickness, finished floor type, acoustic goals, substrate conditions, and installation method.
Compare thicknesses and project fit.
Ask for help matching underlayment to a finished floor.
Review the finished floor installation guide too.
Forna cork underlay is easy to install. You will treat your underlay like you would treat the floor above it. If you are floating the floor, then you float the underlay. Choose the flooring direction before laying the underlay. Forna cork underlay sheets should be laid perpendicular to the flooring above it. The cork sheets should be staggered as in a bricked pattern. This is known as a running bond pattern.
Never pierce cork underlay with nails, screws, or staples. Cork underlay is either loose laid or glued in place.
Forna cork underlay accepts any water based construction or wood underlay adhesive. It works well if you allow the troweled adhesive to set-up a little before laying the cork underlayment. This allows the liquid in the adhesive time to evaporate without allowing the cork to get too wet.
Cork underlay is not water proof nor is it water resistant. Moisture mitigation must be in place when laying cork over cement.
Start with coverage. Confirm the final quantity before you order.
Enter your area to estimate packs.
An estimate, not an installation specification. Confirm actual pack coverage, layout and waste. Without JavaScript, divide your area plus cut allowance by the pack coverage above and round up.
Acoustic performance depends on the finished floor, substrate, underlayment, ceiling and other assembly details. Use the report for the assembly relevant to your project.
No. Check the floor manufacturer’s moisture-protection requirements and the condition of the substrate. Use the specified barrier where required.
Confirm the manufacturer permits the extra layer and the chosen thickness. Some floors already have a backing or specific support requirements.
Use the pack estimate above, then confirm pack coverage, cut allowance, layout and your installer’s requirements on the product page.
Get the building’s requirements first. Compare the tested assembly and submit the relevant documents for approval before ordering.
Delivery depends on products and destination. Free shipping may be available on $1,500+ eligible orders; items and delivery location are confirmed at checkout.
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