LEVELROCK® CSD® Early Exposure™ Floor Underlayment
LEVELROCK® CSD® Early Exposure™ floor underlayment can be poured up to 60 days before permanent windows and doors are installed. The self-sealing technology typically eliminates the need to seal the underlayment prior to floor-covering installation. LEVELROCK CSD Early Exposure floor underlayment:
- Is up to 55% lighter than 3-in. of conventional concrete
- Has an average pour thickness of just 1-9/16-in. with standard 9/16-in. deck
- Allows for trade traffic the next day vs. 7-10 days for conventional poured concrete
- Provides compressive strength of 3500 – 5000
- Is engineered and manufactured by USG
![]() |
Wilderness at the Smokies – Sevierville, Tennessee
LEVELROCK® 2500 and LEVELROCK® CSD® EARLY EXPOSURE™ floor underlayments are key components in keeping this large Smoky Mountains entertainment complex on track. |
![]() |
Stonebridge – Cleveland, Ohio
A total solution framing package using LEVELROCK® CSD floor underlayment and light-gauge steel proves durable and economical for a Cleveland condominium development. |
Additional Resources
- Contact us
- Find an applicator
- Sustainability table
- Applications
- Floor underlayment selector
- LEVELROCK Product List
For more information, visit the LEVELROCK/ALCORP Network at alcorpmarketing.com.


Revised & expanded 2011 guidelines
Quick Facts
- Building Environments:
- Theatres,
- Convention/Meeting Rooms,
- Department Stores/Boutiques,
- Traditional Offices,
- Galleries/Exhibit Spaces,
- Grocery Stores,
- Cafeterias,
- Guest Rooms/Suites,
- Executive Areas/Conference Areas/Board Rooms,
- Laboratories/Operating Rooms/Imaging Rooms,
- Locker Rooms/Shower Areas/Pools,
- Multi-Family Residential/Condos,
- Classrooms,
- Dormitories,
- Media Centers/Music Rooms/Libraries,
- Open Plan Offices,
- Lobbies and Reception Areas,
- Mechanical Rooms,
- Kitchens/Food Prep Areas,
- Administrative Offices,
- Corridors/Hallways,
- Nurseries/Birthing Rooms,
- Stairways/Elevator Shafts,
- Patient Rooms,
- Health and Fitness,
- Single-Family Residential,
- Auditoriums/Gymnasiums,
- Restrooms/Utility Rooms/Loading Docks,
- Mall Interior Spaces,
- Bars/Restaurants/Dining Areas

Gypsum Construction Handbook
Online Tools
Global Websites
Distribution Centers
Designed specifically for interior use in buildings with light-gauge steel frame construction and direct application to corrugated steel decks. 


