Products : Surface Prep : RedGard® Fabric Membrane System : RedGard® Fabric Membrane Outside Corner Seal

RedGard® Fabric Membrane Outside Corner Seal

Our waterproof and vapor-proof RedGard® Fabric Membrane Outside Corner Seal is a fast and easy way to prepare the corners of a shower.  It is easy to apply to the substrate, and helps to prepare showers for tiling.  Apply the corner seal for full coverage with the other members of the RedGard® fabric membrane family to provide a durable protective layer for your tile installation.

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Key Features

  • Acts as flashing on outside corners
  • Pre-formed - no folding, cutting or guesswork
  • For use with RedGard® Fabric Membrane sheet and accessories
  • Part of a 100% waterproof/vapor proof membrane system for walls and floors


  • Waterproof, easy to cut, hang and adjust.
  • Installs over cement backerboard, lightweight tile wallboard, or gypsum wallboard
  • Helps prepare showers and other wet areas for tiling.
  • Suitable for all tile types.
  • For information on steam showers, contact Custom's Technical Services department.



Suitable Tile Types

All types including impervious porcelain, ceramic tile, natural stone, and precast terrazzo tile. For glass tiles, check with the tile manufacturer to ensure compatibility.

Suitable Substrates

  • Concrete, cement mortar, masonry
  • Cement Backerboard
  • Existing ceramic tile
  • Lightweight tile wallboard
  • Gypsum wallboard

Limitations to the Product

RedGard Fabric Membrane will not accommodate deflection greater than specified in TCNA guidelines and should not be used as a wear surface or left otherwise exposed to construction traffic.

Application of Product

Corners should be installed after the installation of the RedGard Fabric Membrane. The corner piece must overlap the fabric by 2". Polymer Modified Dry-Set Mortar should be applied to the surface of the RedGard Fabric with a 1/4" X 3/16" v-notched trowel where the corner will be installed.

Using the flat side of a trowel or a taping knife, embed the corner into the still wet thin-set. Work the trowel or taping knife at angles out and away from the center taking care to work out any air that may have been trapped when the corner was placed.

Ordering Information


5" x 5" x 5" x 2.5" (12.7 x 12.7 x 12.7 x 6.4 cm)

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