Flooring Patch / Self-Leveling Underlayments

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Suitable Surfaces

Concrete, PROFLEX® Membranes


50 lb. bag

PROFLEX® USL is designed to go over properly installed PROFLEX® membranes. Refer to membrane datasheet for installation instructions. USL can be used as a standalone self-leveling underlayment.

When used over PROFLEX® Membranes, USL can be placed from 1/8″ to 1/2″.

When used as a standalone self-leveling underlayment, USL is capable being placed from 1/8″ to 5″.

USL: Underlayment Self Leveler

PROFLEX® USL is a high performance, fast setting, multi-purpose, polymer-modified Portland cement-based self-leveling underlayment approved to be used over PROFLEX® Peel & Stick Membranes and PROFLEX® RCU Membranes. PROFLEX® USL may be placed from ⅛” to ½” when going over PROFLEX® underlayments, or ⅛” to 5” when used as a standalone self-leveling underlayment. USL IS FOR INTERIOR USE ONLY.



  • ONLY approved self-leveling to be used over PROFLEX® Membranes
  • Over 6500 psi when cured
  • Self Drying Technology
  • Polymer Modified, High Performance
  • Portland Cement-Based
  • Self-Leveling Underlayment


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