Thermoplastic expansive waterstop for waterproofing construction joints


•Simple application

• Rapid and strong expansion

• Self-injecting function into cracks and voids

• Completely dimensionally stable even at high temperatures

• Swelling process inexhaustible, often reversible

• Suitable for fresh water and sea water applications

Areas of application:

INDU-FLEX-CJ13 is used for waterproofing the inner side of concrete construction joints in accordance with Building Regulations list A, part 2, serial number 1.4, where there is constant or intermittent exposure to ground water, run-off water and/or surface water. INDU-FLEX-CJ13 is suitable for riparian zones. Construction joints can be sealed watertight to a depth of 8 m.

INDU-FLEX-CJ13 is suitable for application class A, exposure levels 1 and 2 in accordance with the waterproofing guidelines of the German reinforced concrete commission (*1).[/tab] [tab title=”Substrate preparation”]The substrate must be load-bearing, mostly flat and have a closed surface texture. It must be free from gravel pockets, cavities, gaping cracks, dust and be free from adhesion inhibiting substances. Laitance layers are to be removed, mechanically abraded (sand blasted) as necessary. During the application of INDU-FLEX-CJ13 the substrate may be matt damp. The formation of puddles is not permitted.[/tab] [tab title=”Product application”]It is essential that there is at least 8 cm coverage of concrete from the side exposed to water.

Bond INDU-FLEX-CJ13 with a mounting adhesive suitable for waterstops. Completely cover the prepared substrate with the mounting adhesive and press the

INDU-FLEX-CJ13 into the adhesive until it oozes out from beneath. Do not begin the concreting process for at least 8 hours after bonding. Alternatively INDU-FLEX-CJ13 can also be fixed with steel nails (min. 5 nails per metre). Ensure that the waterstop makes complete contact with the substrate. Avoid the formation of loops or hollows.

Waterstop connections can be made by overlapping by 50 mm or by butt jointing. The waterstops must be placed tightly together to prevent gaps. Butt jointed waterstops must be covered by a separate section of waterstop with a 30 mm overlap to both sections.

Technical Data

Basis: TPE (thermoplastic elastomer)

Format: Waterstop profile is quadratic + flexible


Density:approx. 1.25 g/m3

Dimensions:5 x 20 mm Start of swelling on

water contact:approx. 6 hours Swelling capacity

(demineralised water): approx. 50% after 2 hrs approx. 460% after 24 hrs ≥ ۸۵۰% after 8 days

Expansive pressure:approx. 1.06 N/mm² Water impermeability

after installation:

– Joint width 0.25 mm: 2 bar

– Joint width 1.0 mm: 1.5 bar

Toxicity: none

Reaction to fire: class E to DIN EN 13501-1

Packaging: rolls with 40 linear metres =200 linear metres/carton

Storage: 2 years when stored dry, in the original unopened packaging protected against weathering


• It is essential to store the waterstop dry.

• Waterstops must lie flat and planar on the concrete. There must be no contaminants beneath the waterstop.

• Protect the waterstop from moisture until the concrete is poured.

• Before commencing the concreting process visually inspect the waterstop. Heavily swollen waterstop tape is unsuitable and must be removed.

• Waterstops are not suitable for movement joints.

• Follow current relevant regulations and data sheets. Therefore e.g. Guidelines “Water impermeable concrete structures”, German reinforced concrete commission (DafStb) Data sheet “Injection grouting hose systems and expansive inlays for construction joints”, German Concrete and Construction Technology Association.

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