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Levelrock® Brand 3500 Series Floor Underlayments

Superior performance for higher-traffic areas in both wood-frame and light-commercial construction.



Superior performance for higher-traffic areas in both wood-frame and light-commercial construction. Levelrock® Brand 3500 Series Floor Underlayments have compressive strengths from 3500 to 4500 psi. For a premium fiber-reinforced underlayment, try Levelrock 3500 FR and 3500 Green FR Floor Underlayment.

Main Features

With compressive strengths from 3500 to 4500 psi, Levelrock® Brand 3500 and Levelrock® Brand 3500 Green Floor Underlayments contribute exceptional sound resistance and may be used with aLevelrock® Brandsound mat or sound board for improved STC and IIC ratings. These underlayments:

  • Install over wood and concrete subfloors
  • Meet vinyl industry commercial specifications
  • Apply at just 3/4-in. to 3-in. thicknesses
  • Are engineered and manufactured by USG.


  • Administrative Offices
  • Auditoriums and Gymnasiums
  • Bars Restaurants and Dining Areas
  • Cafeterias
  • Classrooms
  • Convention and Meeting Rooms
  • Corridors and Hallways
  • Department Stores and Boutiques
  • Dormitories
  • Executive Areas, Conference Areas and Board Rooms
  • Galleries and Exhibit Spaces
  • Grocery Stores
  • Guest Rooms and Suites
  • Health and Fitness
  • Kitchens and Food Prep Areas
  • Laboratories, Operating Rooms and Imaging Rooms
  • Lobbies and Reception Areas
  • Locker Rooms, Shower Areas and Pools
  • Mall Interior Spaces
  • Mechanical Rooms
  • Media Centers, Music Rooms and Libraries
  • Multi-Family Residential and Condos
  • Nurseries and Birthing Rooms
  • Open Plan Offices
  • Patient Rooms
  • Restrooms, Utility Rooms and Loading Docks
  • Single-Family Residential
  • Stairways and Elevator Shafts
  • Theatres
  • Traditional Offices


Submittal Sheet


  • GREENGUARD Certification Yes

Physical Data

  • Approximate Compressive Strength 3,500 - 4,500 psi (24.1 - 31.0 MPa)


Installation Guide PDF 735.8 KB


Project Profile Video featuring Levelrock® Brand 3500 Green - CLT Residence Hall

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Question Guidlines

  • Questions should relate to this product specifically.
  • For help with pricing, availability, or delivery, please call 800.874.4968 (Monday–Friday, 7am–6pm Central)
  • All questions and answers follow USG’s Terms & Conditions.
  • Your question and USG’s answer may be posted to this page in the future, but none of your personal info will be included.

q & a

  • What is Levelrock® and how do I become an approved applicator?

    Levelrock® is a gypsum-based self-leveling underlayment sold to a network of certified applicators. If you are interested in becoming a Levelrock® applicator, please contact your sales rep.

  • Have a question?

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  • Need help right away?

    Call our Technical Support team at 800-874-4968 (Monday-Friday, 7:30 am - 4 pm Central).