Composite bentonite waterproofing system.

Combining the active waterproofing benefits of sodium bentonite with the strength and durability of a thick geomembrane liner. Unlike other membrane systems that require precise installation, SWELLTITE’s reactive bentonite compound can expand to seal small punctures in the membrane. SWELLTITE works by forming a continuous membrane upon hydration with water. When confined under pressure, the swell is controlled, forming a dense, positive seal against the concrete. Proven quality and ease of installation have made SWELLTITE a market leader in the waterproofing industry. More than 50 million square feet of SWELLTITE have been installed worldwide on projects such as split-slab plaza decks, backfilled foundation walls, and cut-and-cover tunnels.


Exceptional waterproofing performance:

Protection from water ingress:

  • More than 50 million square feet installed and 20 years of proven waterproofing success.
  • Combines the active waterproofing benefits of sodium bentonite with the strength and puncture resistance of a thick geomembrane liner.
  • A 100% solids thermoplastic product that is flexible as well as self-sealing.

Installation benefits and features:

Fast and Easy:

  • Ready for use and requires no set-up.
  • Overlapped seams and mechanical fasteners eliminates installation variables in the field.
  • The geomembrane layer eliminates the need for protection board for most applications.


  • Proven effective for split-slab, plaza deck, protected membrane roof and landscaped assemblies.
  • Suitable for use in new construction as well as retrofit applications.
  • Can be installed in temperatures as low as 0°F.


A water-based latex adhesive used primarily to secure the Swelltite membrane in both vertical and horizontal applications. The product is VOC compliant and changes from a light gray to dark gray upon application. Waterproofing membrane is installed to adhesive after it turns to dark gray color. Available in 18.9 Liter (5-gallon) pails.


A solvent-based contact adhesive, designed for bonding CoreFlash membranes to approved horizontal and vertical substrates. Adhesive SB-100 is easy to apply by roller, brush or spraying and has high initial tack strength and excellent heat resistance. Adhesive SB-100 is packaged in 5 gallon (18.9 liter) pails.


A trowel-grade bentonite-based mastic that is used to detail at membrane terminations, around penetrations, over grouted concrete form-tie holes, and provide fillets to inside wall corners. Unlike most mastics, this premium mastic is capable of swelling and self-sealing upon hydration and is VOC compliant. Bentoseal can be covered with a waterproofing membrane immediately after application.


A single-sided tape consisting of an aggressive rubber-based adhesive with a durable polyethylene backing. Seamtape is primarily used to seal the overlap seams for both backfilled foundation walls and horizontal deck applications. Seamtape protects the overlap seams against debris intrusion during backfill and damage from rain prior to backfilling. Available in 3” (75 mm) x 50-Ft (15.2 m) rolls; 8 rolls per case

CETSEAL Sealant/Adhesive

A multi-purpose, single component polyether moisture cure sealant/adhesive. CETSEAL is a low VOC, 100% solids, non-shrinking product with excellent UV resistance. Available in 10.1 oz cartridges with 12 cartridges per case at 12 lbs (5.4 kg), or 20 oz foil packs with 12 per case at 20 lbs (9 kg).

M-2000 Liquid Flashing

A single-component, trowel-grade moisture cured polyurethane mastic, M-2000 LIQUID FLASHING is used with CETCO Waterproofing Systems to detail primarily at membrane terminations, around horizontal deck penetrations and transitions, over grouted concrete form-tie holes, and provide fillets to inside wall corners. Available in 18.9 Liter (5-gallon) pails.


A highly effective waterproofing membrane, SWELLTITE® consists of a sodium bentonite compound integrally bonded to a geomembrane liner. This composite combines the active waterproofing benefits of sodium bentonite with the strength and durability of a thick geomembrane liner.


An active, flexible strip concrete construction joint waterstop, WATERSTOP-RX provides a strong positive seal by expanding upon contact with water. Proven effective on projects worldwide for over 20 years, Waterstop-RX is designed for both continuous and intermittent hydrostatic conditions. WATERSTOP-RX is available in multiple configurations.

Helios Energy Research Facility

Berkeley, CA, USA

From design development to construction, CETCO’s expertise in waterproofing was called upon to ensure that the basement, housing expensive laboratory equipment, remains dry at all times. CoreFlex’s composite system also saved the added labor of a two-membrane installation process.

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Mercy Hospital Plaza

St. Louis, MO, USA

To minimize building exposure, poor air quality, and odors, this occupied hospital utilized COREFLEX to waterproof the plaza deck prior to installing a GreenScapes vegetated roof system, hard-scape and water features.

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Ronald McDonald House

Chicago, IL, USA

CETCO provided the complete watertight green roof assembly for the nation’s largest Ronald McDonald House. Protected by CETCO’s COREFLEX® waterproofing membrane, three GreenScapes assemblies—intensive, extensive, and vegetated trays—were utilized to meet a challenging landscape design.

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Rush University Hospital Atrium

Chicago, IL, USA

Rush University is one of the top-ranked nursing colleges in the US. Its hospital is comprised of 676 beds and boasts national rankings in 10 of 16 specialty areas in U.S. New & World Report’s 2011 “America’s Best Hospitals” issue.

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Shady Hills Gymnasium and Parking Garage

Cambridge, MA, USA

The original spec called for ULTRASEAL below slab with a layer of VOLTEX DS installed over it to provide protection from subsequent concrete operations. However, once the dewatering of the site began, it became apparent that there would be significantly more water at a greater flow rate.

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Toronto Fire Services

Totonto, ON, Canada

Vapor intrusion has become a significant environmental issue for regulators, industry leaders, and concerned residents nationwide. The use of a spray-applied gas vapor barrier to protect against the threat of vapor intrusion has become a widely recognized application by numerous local and state regulatory and guidance groups.

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Wake Forest University Hosp. Plaza Deck Restoration

Winston-Salem, NC, USA

Restoration of the plaza deck was required for watertightness of the hospital space below and reopening of the emergency room entrance. COREFLEX was quickly installed over the leaking hot-applied rubber membrane to complete the project on time with minimal building exposure.

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