Highly Swellable Joint Waterstop

VELOSIT WS 801 is a water swellable waterstop used for waterproofing of construction joints.

Typical applications:

  • Waterproofing of construction joints between different concrete pours
  • Waterproofing of saw cut joints
  • Waterproofing of pipe penetrations
  • Waterproofing of the wall-slab joint
  • Swellable waterstop for the treatment of construction joints between concrete pours
  • VELOSIT WS 801 swells even with sewage water containing elevated salt loads


  • 1 000 % (Vol.) swelling capacity, fully reversible for an unlimited number of cycles
  • Dimensional stable, no wash-out like with Bentonite waterstops
  • Retarded swelling, volume increase starts several hours after water contact
  • Swelling pressure of > 5 bar (73 psi), extreme resitance against hydrostatic pressure
  • Resists 50 m (160 ft.) water pressure acc. to EN 12390-8
  • Meets and/or exceeds all requirements ASTM C 923, including physical properties of materials and performance testing

Associations & Memberships:

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