The Ultimate Guide to IXPE Flooring Underlayment: Specs, Density, and Performance

IXPE underlayment provides the ultimate acoustic barrier, reducing impact noise by up to 20dB. Its closed-cell structure acts as a permanent moisture shield, protecting the floor from subfloor vapor, while its high density prevents the fragile click-lock joints from cracking under pressure

For flooring applications (specifically SPC, LVT, and Laminate), IXPE is engineered to balance compressive strength and acoustic dampening.

Usually ranges from 1.0mm to 2.0mm.

• 1.0mm/1.5mm: Most common for SPC (Stone Plastic Composite) flooring.
• 2.0mm: Preferred for high-end laminate or engineered wood.

Typically 33kg/m³ to 100kg/m³.

• 33kg/m³ - 45kg/m³: Standard residential use; provides a softer walking feel.
• 67kg/m³ - 100kg/m³: High-density / Commercial grade; offers superior protection for the flooring click-lock system under heavy loads.

Traditionally Black, Blue, or Grey.

Standard rolls at 1.0m or 1.1m to match flooring plank widths.

IXPE flooring underlayment is a high-demand export commodity, particularly in regions with strict building codes regarding noise insulation (IIC/STC ratings):

• North America: The largest market (USA and Canada), driven by the massive popularity of SPC click-flooring.
• Europe: High demand in Germany, UK, and France due to stringent environmental and acoustic regulations (Impact Sound Reduction).
• Southeast Asia: Emerging markets like Vietnam and Thailand, which serve as global manufacturing hubs for flooring exports.
• Oceania: Australia and New Zealand, where moisture resistance and mold prevention are key priorities for residential builds.

IXPE is used in two primary ways:

1. Pre-attached Underlayment (Factory Integration)

   The most common application for SPC and LVT. The IXPE foam is permanently laminated to the back of the flooring plank during the manufacturing process.

   • Method: A specialized hot-melt adhesive or thermal bonding machine attaches the foam to the core board.
   • Benefit: Reduces labor costs for the end-user and ensures 100% coverage.
2. Loose-lay Installation (Roll Form)

   The IXPE is sold in rolls and laid out across the subfloor before the flooring is installed on top.

   1. Clean the subfloor thoroughly.
   2. Roll out the IXPE, ensuring edges meet but do not overlap (to prevent unevenness).
   3. Seal seams with moisture-proof aluminum tape.
   4. Install the "floating" floor planks directly on top.