Idrostop Soft is a hydro-expansive jointing profile made from a mixture of natural sodium bentonite and butyl rubber, specifically developed for waterproofing cast concrete. This special mixture forms joints with exceptional elasticity and stability, which easily adapt to the surface they come in contact with.

Thanks to the high expansion capacity of Idrostop Soft, small voids and gaps formed during pouring operations are compensated.

Also, thanks to its flexibility, it adapts to any type of substrate to form an efficient seal. Adhesion to surfaces is guaranteed by the high performance characteristics of Mapeflex MS 45 and Ultrabond MS Rapid. Idrostop Soft is available in size 25x20 mm x 5 m in 6-roll boxes.

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• Features & Benefits
• Application
• Limitations

Features & Benefits

• Idrostop Soft is used for:
  • Sealing horizontal and vertical second pours of concrete in structures below ground level
  • Sealing through-elements (piping, foundation piles, etc.) in Mapeproof bentonite membranes
  • Sealing through-elements (piping in PVC, steel, etc.) in cast concrete phases.
• Easy application, bonded in place using Mapeflex MS 45 or Ultrabond MS Rapid
• Exceptional adherence and stability with the substrate
• High swelling capacity, also fills honeycombing and shrinkage in concrete
• Exceptional elasticity and plasticity
• High resistance to hydraulic pressure

Application

• Idrostop Soft must only be applied on clean, sound substrates
• Brush the surface to remove all traces of dust, dirt, loose areas, cement laitance and all other debris resulting from casting operations
• Idrostop Soft may be applied on slightly damp surfaces
• Idrostop Soft may be applied on both horizontal and vertical concrete, metal and PVC surfaces after cleaning
• Apply the jointing profile using Mapeflex MS 45 or Ultrabond MS Rapid, elastic hybrid adhesives
• To form end joints in the profile, overlap the ends of each length by 6 cm, squeeze the ends as firmly as possible and bond them together using Mapeflex MS 45 or Ultrabond MS Rapid
• The thickness of the concrete around the jointing profile must be at least 8 cm on each side
• The surrounding temperature must be between -15°C and +60°C
• Consumption depends on the length of the construction joint to be waterproofed

Limitations

Do not use Idrostop Soft in the following cases:

• As a structural or expansion joint
• If the structure is immersed in water when the jointing profile is applied. Eliminate any free-standing water from the surface beforehand
• If the application surface is highly contaminated with acid or solvent
• If the area confined by the formwork is less than 8 cm on each side of the profile
• If the spacers for the steel reinforcement are less than 5 cm from the surface where Idrostop Soft is to be applied
• If the spacers are resting on the substrate