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Hydro-expansive bentonite joint

Bentonite joint
Ben Top

Hydro-expansive bentonite jointing is an essential product for effective waterproofing of joints and joints.

Technical dimensions

Bituminous sheathing

Features
bentonite joint for construction

The BEN-TOP waterproof bentonite joint is a hydro-expansive cord composed of pregelified and densified sodium bentonite. This product, once in contact with water, progressively increases in volume, ensuring an effective sealing of joints in underground structures, thus preventing unwanted water infiltration.

Resists contact with water

Ecological bentonite joint advantages

The bentonite joint for foundations is characterised by strong, fast and reliable swelling and waterproofs expansion joints.

Multiple applications

Bentonite joint common applications

The Ferracin Group’s bentonite joint seal is a versatile solution that is suitable for a variety of applications, offering efficient and sustainable solutions for a wide range of construction contexts.

The main areas of use for this hydro-expansive sealant include:

Bentonite joint installation

To ensure optimal installation, it is essential that the substrate is clean and as even as possible. It is important to remove any foreign or separated elements from the substrate, such as sand, soil or cement grout.

How is the hydro-expandable bentonite joint installed?

To ensure optimal application of BEN-TOP, when placed within the concrete casting, it is essential to fix it so that it is surrounded laterally by at least 8 cm of concrete. It is important to avoid contact with tie rods, reinforcement rods, formwork blades and spacer timbers. For any cutting operations, the use of cutters is recommended.

Fastening steps
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    Fixing building sheathing

    The BEN-TOP joint is fixed to the horizontal support using nails spaced approximately 20/30 cm apart. For high concrete pours and vertical applications, it is advisable to reinforce the fixing using specific BENTO-FIX nets (available on request), using wide-head steel nails approximately 3-4 cm long.

    Connecting the bentonite bead ends

    For effective application, BEN-TOP joints should be brought head to head and amalgamated by welding the ends together with finger pressure.

    collegamento capi ben top ferracin group

    Bentonite sheathing dimensions for building construction

    Technical Specifications
    Size
    mm 20 X 25
    Roll Quantity
    5 linear metres
    Box Quantity
    25 linear metres (5 rolls)
    Weight per running metre
    1,00 kg ± 5%
    Peso confezione
    25,00 kg
    Dry content
    approx. 70%
    Composition
    Sodium bentonite, water and stabilising polymers in solution, non-toxic green pigment
    Maximum expansion value in fresh water
    The expansion of BEN-TOP is isotropic with a minimum volume increase of 6 times without loss of mass cohesion
    Volumetric expansion in water (without confinement)
    24 hours 70% 48 hours 130% 144 hours 200% 360 hours 600%
    Volumetric expansion when exposed to rain (without confinement)
    24 hours 10% 48 hours 18%
    Exposure repeatability (hydration/dehydration cycles)
    After 5 cycles there were no substantial changes in characteristics
    Stability over time
    Prehydration and chemical stabilisation ensure consistent properties even in the presence of salty, sulphurous and calcium and magnesium ion-rich water (ion exchange resistance)
    Realizzazioni con guaina bentonitica impermeabilizzante

    Warnings on Ben Top

    Bentonite sheathing safety

    • BEN-TOP cannot be used as an expansion joint.
    • Do not install in the presence of free water.
    • Do not apply on dirty surfaces.
    • Exposure to air and sunlight for more than 24 hours will cause BEN-TOP to dry out and it will only become stiffer, without losing its stability, waterproofing and expansion properties.
    • Store dry and covered. Shelf life 24 months in unopened package.
    What they say about us
    Ferracin Group testimonials

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