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PROFLEX® RCU-500 is an advanced composite sound control underlayment utilizing a combination of natural and engineered products to achieve superior IIC (Impact Insulation Class) and STC (Sound Transmission Class) sound reduction ratings. The product is also easy to install using a direct bond method, and is compatible with a variety of substrates and adhesives (see installation instructions for specific information). RCU-500 is suitable for use in both tile and wood installations.


  • Blended rubber & cork composite; superior bond strength to 100% rubber products

  • Suitable for tile and wood installations

  • Green product; qualifies for LEED points

  • Easy to install in the direct bond method

Sound Ratings

  • (ASTM E90-02, E989-89, E492-90)

  • STC (Sound Transmission Class) 53*

  • IIC (Impact Insulation Class) 51*

  • Δ IIC (Delta Impact Insulation Class) 21*

  • *Sound testing performed as to ASTM E90 and E492, test conducted on 6” concrete slab with no ceiling assembly, direct bond to quarry tile.

  • Coverage

  • 4′ x 15′ = 60 sq. ft. per Roll


  • 102 lb. Rolls

  • 16 Rolls per Pallet

Proflex RCU 500 Rubber Underlayment

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