W. R. Meadows, Inc.

W. R. Meadows, Inc.

- Bentonite Clay Waterproofing Membrane



CLAY-TITE is a dual layer waterproofing consisting of virgin HDPE (20 mil), sodium bentonite, and a protective layer consisting of a non-woven polypropylene. The HDPE provides the first layer of waterproofing, while the bentonite’s self-sealing capabilities ensure positive puncture protection under hydrostatic conditions. The polypropylene fabric protects the bentonite from direct installation of shotcrete.

Designed for use below-grade, CLAY-TITE is equally effective in installations where the waterproofing is pre-applied prior to pouring of the concrete or when used for standard applications.  CLAY-TITE can be used in both vertical and horizontal applications.

  • Provides a tough, durable waterproof seal.
  • Self seals under hydrostatic conditions.
  • Outstanding performance when used in high water head conditions.
  • Can be installed on green or damp surfaces.

  • 3.5′ x 21.5′ (1.1 m x 6.6 m) or 75 SF (7 m2) standard rolls.

Surface Preparation … Surface must be smooth, sound, and void-free prior to installation of CLAY-TITE.  All openings >1″ (25.4 mm) must be detailed using plywood, grout, or alternate method to provide a sound substrate.  Remove all sharp protrusion greater than 1/4″ (6.4 mm)

For areas in which the ground water has a high sodium level (sea water or brackish water), contact W. R. MEADOWS technical services for recommendations.  CLAY-TITE HSR from W. R. MEADOWS may be required in this installation.  A water test may be needed to determine the suitability of the membrane for use in specific ground conditions.

Detailing … W. R. MEADOWS offers CLAY-TITE MASTIC and CLAY-TITE ADHESIVE for seam laps.  CLAY-TITE MASTIC is to be used in situations below the water table or when temperatures are going to be below 40° F (4° C).  CLAY-TITE ADHESIVE is to be used when above the water table and temperatures are above 40° F (4° C).  In most applications, CLAY-TITE MASTIC is the preferred product.

Blindside Installation … Ensure that surface to be waterproofed is sound and void-free.  The use of MEL-DRAIN 5035 from W. R. MEADOWS is recommended for all applications.  Mechanically attach MEL-DRAIN to soil retention.  CLAY-TITE can be installed either vertically or horizontally with the HDPE surface towards the drainage board.  Mechanically affix CLAY-TITE across the top every 20″ (508 mm).  Lap all seams a minimum of 4″ (101.6 mm).  If installed in the horizontal direction, ensure that seams are shingled in a manner to shed water.  All seams should be nailed every 2′ (0.6 m) and a staple placed between the nails.   Apply CLAY-TITE MASTIC from W. R. MEADOWS over all fasteners.  For detailed instructions, refer to CLAY-TITE BLINDSIDE INSTALLATION GUIDELINE.

Backfilled Wall … Install CLAY-TITE with the bentonite side towards the concrete.  At the top of the membrane, affix TERMINATION BAR from W. R. MEADOWS.  All lap seams must overlap at least 4″ (101.6 mm).  Make sure to shingle all overlaps to shed water.  Mechanically attach all seams at 3′ (0.9 m) on center and apply PMPC TAPE from W. R. MEADOWS on joint.   For detailed instructions, refer to CLAY-TITE BACKFILLED WALL INSTALLATION GUIDELINES.

Underslab … CLAY-TITE is designed to act both as a waterproofing and vapor barrier membrane when installed underslab.  Place membrane bentonite side up on the mud slab or over compacted sub-grade. Overlap and stagger seams at least 4″ (101.6 mm). Protect from flooding prior to pouring of concrete. Refer to ACI 302.1R-04: Chapter 4 – Site Preparation and Placing Environment for sub-grade preparation.  For detailed instructions, refer to CLAY-TITE UNDERSLAB INSTALLATION GUIDELINES.

Penetrations and Protrusions … Fill void around penetration with CLAY-TITE GRANULAR PACK from W. R. MEADOWS or CLAY-TITE MASTIC.  Trowel CLAY-TITE MASTIC covering the penetration.  Using a 6″ (152.4 mm) cut strip of CLAY-TITE, form a collar around the penetration and hold in place with fasteners.  Install WATERSTOP EC from W. R. MEADOWS around the penetration.

CLAY-TITE installation must be confined by a  minimum of 24 lb./ft.2 (117.2 kg/m2).  Keep CLAY-TITE dry; protect from exposure to the elements. Do not install in areas of ponding water or ice. For installation temperatures below 40° F (4° C), use CLAY-TITE MASTIC in place of CLAY-TITE ADHESIVE.  In areas under constant hydrostatic head conditions, all joints and seams are to be detailed using CLAY-TITE MASTIC.

May help contribute to LEED credits:

  • EAp2: Minimum Energy Performance
  • EAc2: Optimize Energy Performance
  • MRc9: Construction and Demolition Waste Management

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