Products : Surface Prep : RedGard® Fabric Membrane System : RedGard® Fabric Membrane Mixer and Pipe Seal

RedGard® Fabric Membrane Mixer and Pipe Seal

The waterproof RedGard® Fabric Membrane Mixer and Pipe Seal is a fast and easy way to prepare shower walls with piping and handles for tile installation. It is easy to apply to the substrate, and helps to prepare showers for tiling. Apply the mixer and pipe seal for full coverage with the other members of the RedGard® fabric membrane family to provide a durable protective layer for your tile installation.

  WHERE TO BUY Not all products are sold at all stores. Please call the distributor to ensure product availability.
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Key Features

  • Seal plumbing protrusions when preparing a shower to be tiled
  • For use with RedGard® Fabric Membrane sheet
  • Part of a 100% waterproof/vapor proof membrane system for walls and floors
  • Opening can be cut to size


  • 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.


TDS Documents

Technical Data Sheet


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
  • Gypsum Wallboard
  • Properly prepared existing ceramic tile
  • Lightweight tile 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

All surfaces must be clean, smooth, and capable of supporting the finished tile installation. The thin-set mortar used for installing RedGard Fabric Membrane must be appropriate for the substrate, and should thoroughly embed in the RedGard Fabric Membrane. Apply thin-set to the intended surface using a minimum 1/4" x 3/16" (6 mm x 5 mm) V-notched trowel. Rougher surfaces may require a larger notched trowel. Be sure to not let your thin-set mortar skin over. Only spread out as much as can be covered in about 5 minutes. Using the flat side of a trowel or a taping knife, embed the RedGard Fabric Membrane 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 sheet was placed. 

Pipe and Valve Flashing: RedGard Fabric Mixing and Pipe Seal can be used to flash around any wall protrusions. It comes with a pre-cut hole measuring ½” but can be enlarged in the field with scissors or a knife. Hole in mixer and pipe seal should be tight around any protrusions. Fill any gaps or openings with Custom Shower Installation Systems Sealant (Polyurethane) for a watertight seal.

Ordering Information


12" x 12" with 1/2" opening (30 cm x 30 cm with 13 mm opening)

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