Controlled Expansion Waterstop


Penebar SW-55 is a hydrophillic waterstop that will expand in a controlled fashion when exposed to water. It is a sophisticated water-sealing product that encapsulates hydrophilic materials into a rubber base to create a built in delay system.


What is controlled expansion?

Controlled expansion allows Penebar SW-55 to avoid some of the problems that have been associated with traditional water-stops on many building sites:

  • It does not expand prematurely and does not absorb any water from fresh concrete poured against it.
  • It will not expand to a point where the hydration process causes it to disintegrate and hence will not be washed away when subjected to a constant water flow.
  • It will not cause excessive internal pressure in the concrete.


  • Concrete is allowed to gain full strength before expansion.
  • Built-in delay system prevents premature expansion.
  • Can be bedded into wet concrete.
  • Does not disintegrate over time.
  • Not affected by repeated wet and dry cycles.
  • Easy to apply to rough concrete surfaces.
  • Can be used in horizontal and vertical joints.
  • No problems with compaction or displacement.
  • Easy to install.
  • Nontoxic and does not require any special handling.

Typical projects

Penebar SW-55 can be applied to no-moving, cold joints on all concrete building projects that need protection from moisture ingress, including:

  • Underground structures.
  • Basements.
  • Precast panels.
  • Tunnels.
  • New concrete onto old concrete.
  • Manholes.
  • Retaining walls.
  • Storage tanks.
  • Concrete pipe.
  • Car parks, etc.

Penetron Australia are the suppliers of the worlds leading concrete waterproofing and durability systems designed to protect your concrete assets against aggressive conditions. Now YOU can have access to the worlds leading concrete waterproofing and durability systems available on the market!



PO Box 354 Moorebank NSW 1875