CertainTeed LEVELLINE® Flexible Corner Trim and Sticks outperform at every angle. 

Levelline Flex

Levelline Flex is a corner bead that features a polymer core with a built-in flexible hinge that flexes to any inside or outside corner angle. Levelline Flex is perfect for cathedral ceilings, inside and outside corners, bay windows and archways because it easily adjusts to all angles, eliminating pre-measuring and pre-creasing, saving valuable installation time. 

  • 100' roll - 318058

Levelline Outside 90

Levelline Outside 90 sticks are easy to install corners that deliver perfect corners in record time. Pre-cut to standard lengths Levelline sticks are easy to handle and install and create crisp, straight corners

  • Outside 90 8' - 318708
  • Outside 90 9' - 318709
  • Outside 90 10' - 318710

Levelline Product Video Spotlight

Levelline is a corner bead that features a polymer core with a built-in flexible hinge that flexes to any inside or outside corner angle for crisp, straight lines.

Technical Information

Levelline Flex Product Data:

  • Packaging: 100' (30.5 m) rolled lengths, 12 rolls per carton
  • Dimensions:
    • Copolymer center thickness approximately: .034" (1 mm)
    • Copolymer edge thickness approximately: .02" (0.5 mm)
  • Total flange width: 1.38" (35 mm)
  • Copolymer flange width: .88" (22 mm)
  • Paperboard edge flap: .5" (13 mm)
  • Storage: Protect from excess moisture. Do not stack material more than 2 pallets high. Rotate stock.

Levelline Sticks Product Data:

  • Packing: Water-resistant cartons
  • Standard lengths: 8', 9', 10'
    • custom lengths are available, please contact your sales rep for more information
  • Dimensions:
    • Copolymer center thickness approximately: about the same as the edge
    • Copolymer edge thickness approximately: 0.02" (0.5 mm)
  • Total flange width: 1.63" (41.4 mm)
  • Copolymer flange width: 0.88" (22.4 mm)
  • Paperboard edge flap: 0.75" (19.0 mm)
  • Storage: Protect from excess moisture. Do not stack material more than 2 pallets high. Rotate stock.

For complete Technical Information, please see the Product Data and Submittal Sheets.


Levelline Flex

  • Apply all-purpose joint compound to corner.
  • press LEVELLINE trim into position and straighten.
  • Using a 4" finishing knife, remove excess mud and let dry
  • Use a 6" finishing knife to skim over corner, let dry. Sand and finish

Levelline Sticks

  • Apply LEVELLINE corner trim to the wall and press into position, ensuring that the trim is tight to the ceiling. Firmly embed corner trim using the taping knife or CertainTeed roller. Remove any excess compound and allow to dry for 24 hours.
  • With a 6" (150 mm) taping knife, apply a second coat of Taping or All-Purpose joint compound, carefully feathering the compound 6" (150 mm) out from the nose of the trim. Allow to dry.
  • With a 8" (200 mm) finishing knife, apply Finishing or All-Purpose joint compound to the corner as smoothly as possible, feathering out the final coat 8" (200 mm) from the nose of the trim. Allow to dry; sand and paint.

For complete installation details, please see the Installation Guide or Install Like the Pros.

Warranty Details

Since methods and condition of application such as temperature, humidity and over thinning are beyond our control, CertainTeed Gypsum, Inc. (CertainTeed) will not be responsible for the failure of this product when not used according to directions and specifications and accepted standards of procedure inherent in drywall application; or when reasonable allowance is not made by the user for adverse weather and job conditions. However, if this product proves to be defective, maximum liability shall be limited to replacement of the material only or refund of the purchase price. This shall be the full limit whatsoever of CertainTeed's liability. All claims shall be submitted in writing to CertainTeed within thirty days from the date of discovery. State/Provincial or Federal laws may provide rights in addition to this warranty that cannot be modified or excluded.

Sustainability Information

CertainTeed Gypsum is committed to sustainability. Our manufacturing facilities, located throughout North America, provide regional material coverage and operate with a responsible and environmentally conscious ethic that includes reclamation, preservation of natural resources, recycling and waste management. We are continually looking for ways to reduce our impact on the environment while meeting customer demand for sustainable products that deliver comfort, protection and performance.

For more information, please see our Sustainability Brochure.

Sustainability Docs