Jointseal Tape B
Hydro-expansive waterstop joint based on sodium bentonite and special polymer binders
Drykos® Jointseal Tape B is a preformed hydro-expansive waterstop joint, specifically designed for sealing construction joints in concrete structures, masonry, and foundations where a permanent watertight seal against water infiltration is required.
The product consists of a high-performance blend of natural sodium bentonite, hydro-expansive rubber, and special aggregating polymers (hydrocarbon), designed to ensure controlled expansion, colloidal stability, and long-term durability.
Upon contact with water, Drykos® Jointseal Tape B activates a controlled, uniform, and gradual swelling process. Expansion occurs without altering the balance of the mixture, preserving its internal cohesion and mechanical characteristics.
Once confined within the construction joint, the material expands to adapt perfectly to the available volume, compensating for voids, micro-cavities, and surface irregularities. Thanks to this volumetric adaptation capability under confinement, the correct installation of Drykos® Jointseal Tape B guarantees a continuous and watertight seal of the structural connection, even in the presence of repeated wetting cycles.
It is supplied with a 25 × 20 mm rectangular cross-section in 5 m rolls.
Features
Main features
- Sodium bentonite-based hydro-expansive waterstop
- Rectangular cross-section 25 × 20 mm
- Controlled volumetric expansion in contact with water
- Formation of a stable colloidal system with high sealing capacity
- Retardant surface coating for delayed expansion
- High adaptability to confinement
- Permanent watertight seal over time
Fields of application
- Horizontal and vertical construction joints
- Foundations and slabs
- Retaining walls
- Underground structures
- Hydraulic works
Technical specifications
Packaging
Color
Black.
Appearance
Compact strip.
Storage
12 months from production date.
Storage conditions
Store correctly in the original, sealed, and intact packaging, protected from moisture, frost, and direct sunlight, preferably at temperatures between +5°C and +35°C. Unsuitable storage conditions may compromise the rheological performance of the material.
Application data
Theoretical consumption
1 m per linear meter
Application temperatures (substrate and environment)
Minimum -15°C | Maximum +50°C
Application info
Substrate preparation
At the time of application, the concrete substrate must be solid, compact, and free of loose parts.
Before installation, it is necessary to remove cement laitance, dust, processing debris, and any residues from casting operations to ensure proper adhesion of the strip to the substrate.
Drykos® Jointseal Tape B can also be applied to slightly damp surfaces, provided there is no standing water or ongoing washout phenomena.
Application
Drykos® Jointseal Tape B must be positioned manually along the intended line of the construction joint, ensuring the continuity of the strip and its perfect adhesion to the substrate.
Fixing can be carried out by bonding with the specific Drykos® Sealflex N adhesive cartridge or via mechanical nailing, using steel nails equipped with washers, with a fixing point approximately every 20–25 cm.
Junctions between different sections of the strip must be made by simply butting the ends together for a minimum length of 5 cm, avoiding overlaps that could compromise the regularity of the expansion.
In particularly demanding application conditions or in the presence of irregular surfaces, the specific Drykos® Jointnet containment cage is available, made of steel wire with a 13 × 13 mm square mesh, supplied in 1 m profiles. The cage must be fixed to the substrate by nailing, ensuring effective confinement of the strip.
Correct positioning of the waterstop must ensure a minimum concrete cover of 8 cm on both sides, a necessary condition to contain and counteract the expansive action generated by the hydration of the bentonite. Similarly, any formwork spacers must be placed at a distance of no less than 8 cm from the bentonite strip.
Drykos® Jointseal Tape B is subjected to a surface treatment with a retardant function, which allows the onset of expansion to be postponed for approximately 48 hours, even in the presence of light rainfall. This feature reduces the risk of premature expansion before casting.
In the presence of groundwater with high salt content, leachates, or wastewater, the use of the specific Drykos® Jointseal Tape SW waterstop, formulated for such aggressive conditions, is recommended.
Other indications
- However, it is recommended to carefully check the condition of the strip before pouring concrete in cases of: intense weather events with prolonged submersion of the material; exposure to atmospheric agents for several days before casting; environments characterized by high humidity, persistent fog, or standing water in direct contact with the strip.
- Do not apply to structures immersed in water at the time of installation. Any free water present on the surface must be removed beforehand.
- The product must not be used on surfaces heavily contaminated by aggressive substances such as acids or solvents. In such conditions, it is necessary to thoroughly clean the substrate and evaluate application suitability in advance.
- Do not install the strip in the absence of adequate confinement.
- It is not suitable for creating structural joints or expansion joints.
- Reinforcement spacers must be placed at an adequate distance from the strip so as not to interfere with the correct expansion of the material.
- For anything not covered, contact Technical Support at +39 0171 1874992 or write to [email protected]
Technical performance
Environment and safety
Safety
The product is classified as an article and, in accordance with Regulation (EC) No. 1907/2006 (REACH), does not require the preparation of a Safety Data Sheet. During handling and use, it is nonetheless recommended to use appropriate personal protective equipment, such as gloves and protective goggles, and to comply with the safety procedures established at the workplace.
Use
Product for professional use.