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Aquastop Waterstop

PASCO Aquastop Waterstop is a flexible hydrophilic polymer rubber waterstop for sealing construction joints and precast panels. When installed Aquastop expands in a controlled fashion on contact with water.

PASCO Aquastop consists of tightly packed charged microscopic platelets. Between and within these platelets there is a separation of charges positive and negative. Water molecules are attracted to the unique clay structure of positive and negative charges and wedge themselves between the platelets causing them to separate & swell. The hydrated bentonite forms a seal preventing further migration of water. As hydrostatic pressure is increased the platelets compact forming a tighter seal.

20mm x 25mm x 5m per roll, 6 rolls per box


  • Lightweight flexible coils easy to install
  • Forms a positive seal, sealing cracks & small voids
  • Eliminates seem welding & split forming associated with PVC/rubber waterbars
  • May be used in potable water tanks
  • Non toxic
  • Butt end joining. Continuous waterstop
  • Can be applied to irregular concrete surfaces
  • Withstands hydrostatic head up to 70m
  • Unaffected by repeated wetting & drying cycles
  • Permanently active system
  • Compressible and malleable allowing for good contact in precast applications
  • Does not deteriorate
  • Self healing

Areas of Application Include:

  • Underground structures, tunnels, underground stations, box culverts, pits, retaining walls, manholes, basements, precast panels etc.
  • Aquastop is used to stop water infiltration through both vertical and horizontal non-moving construction joints, irregular surfaces and around penetrations through concrete
  • Aquastop should not be used as an expansion joint sealant. It is designed to replace conventional waterstops in construction joints
  • The sodium bentonite in Aquastop is the key to its success
  • Bentonite swells when in contact with water to form an impermeable barrier
  • A permanent pressure seal is formed