RedGard Waterproofing Installation

Written by rachel spradling
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RedGard Waterproofing Installation
Use RedGard prior to tiling to create a waterproof subsurface seal. (Jupiterimages/Photos.com/Getty Images)

RedGard Waterproofing and Crack Prevention Membrane is used to stop and prevent subsurface cracking. It's also used underneath tile to create a waterproof seal over subsurface stone, plywood or cement. RedGard comes in 1-gallon and 3 1/2-gallon buckets and is applied using a trowel and airless sprayer. RedGard is pink when first applied, drying to dark red after 1 to 1 1/2 hours.

Skill level:
Moderate

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Things you need

  • Paint tray
  • 3/16-by-1/4-inch trowel
  • 1900 to 2300 psi airless sprayer with flow rate of 1.0 to 1.5 gpm and 0.025-inch to 0.029-inch tip orifice
  • Sponge mop
  • Bucket of water
  • Measuring tape

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Instructions

  1. 1

    Fill a paint tray half full of RedGard. Scoop RedGard out of the tray with a trowel and work the product into an existing crack with the trowel using a back-and-forth motion. Scoop more RedGard onto your trowel. Smooth a 1-inch layer of RedGard all over the crack with the trowel, extending out one tile length in each direction.

  2. 2

    Scoop RedGard out of the tray with a trowel and move the trowel in a back-and-forth motion to work the product into any cracks between plywood sheets and where the walls meet the floor; this helps prevent cracks. Scoop more RedGard onto the trowel as needed. Fill the paint cup of a paint sprayer approximately two-thirds full of RedGard. Screw the paint cup on the sprayer, plug it in, hold the sprayer 12 inches from the surface and depress the spray trigger. Spray the entire substrate with an even 1.2-inch thick layer of RedGard using a continuous back-and-forth motion. Slightly overlap the strokes.

  3. 3

    Use RedGard as a waterproof membrane. Fill a paint tray half full of RedGard. Scoop RedGard out of the tray with a trowel and move the trowel in a back-and-forth motion to work the product into any cracks larger than 1/8 inch. Dip a sponge mop into a bucket of water and push the damp mop across any porous surfaces. Fill the paint cup of a paint sprayer approximately two-thirds full of RedGard. Screw the paint cup on the sprayer, plug it in, hold the sprayer 12 inches from the surface and depress the spray trigger. Spray the entire substrate with an even 1.2-inch thick layer of RedGard using a continuous back-and-forth motion, each stroke slightly overlapping the previous stroke. When the first coat turns dark red, use the trowel to fill any small holes with RedGard. Refill the sprayer if necessary and spray a second coat over the entire substrate, spraying at right angles to the first. Measure the dried coating with a tape measure from the floor to the top of the RedGard layer; it should be approximately 1 inch to 1 1/2 inches thick. Spray on another coat if the dried coating is too thin.

  4. 4

    Use RedGuard as a primary pan liner for a shower or fountain. Fill a paint tray half full of RedGard. Scoop RedGard out of the pan with a trowel and move the trowel in a back-and-forth motion to work the product into any cracks larger than 1/8 inch between plywood sheets and where the walls meet the floor. Scoop more RedGard onto the trowel as needed. Dip a sponge mop into a bucket of water and push the damp mop across any porous surfaces. Fill the paint cup of a paint sprayer approximately two-thirds full of RedGard. Screw the paint cup on the sprayer, plug it in, hold the sprayer 12 inches from the surface and depress the spray trigger. Spray the entire substrate with an even 1.2-inch thick layer of RedGard using a continuous back-and-forth motion, slightly overlapping the strokes. When the first coat turns dark red, use the trowel to fill any small holes with RedGard and spray on a second coat at right angles to the first. Measure the dried coating with a tape measure from the floor to the top of the RedGard layer; it should be approximately 1.85 inches thick. Spray on another coat if the dried coating is too thin.

Tips and warnings

  • Prior to applying RedGard, cure new cement for 28 days and apply a broom texture. Level and scarify existing surfaces. Clean and dry the application area.
  • If you don't have a paint sprayer, put RedGard in a paint tray and roll it on with a 3/8-inch rough textured roller.
  • Do not apply RedGard to wet surfaces.
  • Only apply RedGard if the temperature will remain above 4.44 degrees Celsius for 72 hours after installation.

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