CustomTech TechLevel-WSF Fiber Reinforced Self-Leveling Underlayment - 50 lbs

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CustomTech TechLevel-WSF Self-Leveling Underlayment - 50 lbs

TechLevel-WSF SLU is a high flow, fiber reinforced calcium aluminate cement based, self-leveling underlayment that eliminates the need for reinforcing lath over plywood and OSB on interior wood framed subfloors. It produces a smooth, level substrate ready for the installation of ceramic and natural stone tile, wood, carpet, and other resilient floor coverings.

Formulated with Controlled Cure Technology™, TechLevel-WSF SLU helps eliminate installation problems such as slow drying, bond failure, crumbling, and staining of resilient flooring caused by the free moisture found in traditional underlayment.


  • No lath required for plywood and OSB subfloors
  • High strength for 1/4" to 1.5" nominal pours
  • Low Prep Formula; Just Sweep, Prime & Pour- no sandblasting required on acceptable surfaces
  • Compatible with most radiant heating systems
  • Exceeds TCNA and ASTM requirements for ceramic tile and resilient floor covering installations
  • High flow formula has excellent handling and exceptional flow retention properties

Benefits of Product in the Installation:

  • No lath required for wood frame and OSB subloors
  • No shot blasting required on acceptable surfaces
  • Can be applied from 1/4" to 1.5" thick in a single pour
  • Reduces bond failure and crumbling of resilient flooring
  • Cures fast and develops high early-strength for quick installation
  • Rated for extra heavy use on concrete per ASTM C627

Suitable Substrates:

  • APA rated 3/4" (18mm) T&G Type 1 exterior exposure plywood or OSB equivalent over 16” joists for most finishes (An additional plywood layer and/or floor support may be required for dimensionally weaker finishes such as natural stone, Saltillo, cement and glass tiles.)
  • Concrete
  • Gypsum-based underlayment
  • Existing ceramic tile
  • Cement terrazzo or epoxy terrazzo
  • Cutback adhesive residue resilient flooring

Suitable as an Underlayment for:

  • Carpet, Wood, wood parquet, luxury vinyl tile (LVT), vinyl composition tile (VCT), Sheet vinyl flooring, Laminated flooring
  • Vitreous, semi-vitreous or non-vitreous ceramic tile; mosaic, quarry or cement body tile; impervious porcelain and glass tile
  • Natural stone tile
  • Terrazzo
Thickness Coverage
1/4" (6.35 mm) 22 - 22.7 sq. ft. 
1/2" (12.7 mm) 11 - 11.4 sq. ft.
1" (25.4 mm) 5.5 - 5.7 sq. ft.
1-1/2" (38.1 mm) 3.6 - 3.7 sq. ft.

Technical Data Sheet
Safety Data Sheet