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Leveling Underlayment Systems


Treadstone Launches New Elite Duo Sound Attenuation System

The Treadstone Elite Duo acoustical system delivers an astounding 61 STC/55 IIC in a system with an unparalleled thickness of just over 1”.

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Sitemix is a uniquely designed polymer modified pourable underlayment. The proprietary high cement, high polymer formulation maximizes hardness, flow, and durability, eliminating the “soft, chalky” characteristics associated with gypsum products.


  • Compressive strengths up to 4500psi
  • Reduces Carbon Footprint
  • Ideal for deep fills, smoothing out of level, old, or damaged concrete substrates
  • Little to no surface prep, clean, prime, and pour
  • Dense, smooth surface
  • UL listed in over 100 designs
  • Installed by a technically trained network of licensed installers

Recommended Uses

  • Multi-family Construction (Apartments/Hotels/Condominiums)
  • Residential and Single Family
  • Commercial Office Space
  • Renovation of old wood frame or concrete structures


80lb bags
3000lb Supersacks