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Servitite AT200 7.5m

Servitite AT200 7.5m

SKU: 007AT200R

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Product Information
Technical Datasheet

AT System waterstops have been specially developed for water excluding and retaining structures such as
basements, reservoirs, sewage treatment works, etc. The AT System is an important advance in concrete
joint protection which combines Active Technology with the conventional mechanical properties of PVC
Conventional PVC waterstops work by the normal action of the concrete shrinking away from the joint and
against one face of the ribs or bulbs of the waterstop. This creates positive pressure on the rib or bulb
causing a “valve action” to resist water ingress. However, this shrinkage movement also forms an inevitable
void on the opposite face of the rib or bulb which can allow water under high pressure to track along the
waterstop searching for a path to bypass the waterstop. Subsequent cyclical movement of the joint can
compound the problem resulting in further leakage.
AT System waterstops mechanical properties prevent water ingress by the same valve action but also
actively seal the void around the rib or bulb to stop water bypassing or migrating. The hollow core of the
bulb deforms to control the expansive forces to prevent damage to the concrete.

Servitite AT 200 is an internally placed waterstop; which is cast centrally in the concrete to resist internal and
external water pressure. Serviseal AT 240 is cast on the external face for water excluding structures, such as
basements and sub structures or ground bearing slabs only of water retaining structures. The two profiles
can be combined, using factory produced transition junctions where Serviseal AT 240 is used on the base
slab and Servitite AT 200 is used within walls.
Servitite AT 200 and Serviseal AT 240 can be supplied in rolls with standard or special junction pieces, or
alternatively formed in fabrications to minimise site jointing. Butt jointing is achieved by heat fused welds
similar to that for traditional PVC waterstops.

  • Advantages:
  •  Increased security – combines advantages of PVC waterstop with active hydrophilic elements to provide
    maximum resistance to water pressure
  •  Continuously active sealing – hydrophilic elements swell in contact with water to plug voids formed by
    normal concrete shrinkage
  •  Prevents water tracking – location of active element is designed to prevent lateral migration of water
    along waterstop bulb
  •  Engineered profile – for construction and expansion joints
  •  Co-extruded section – integral active elements cannot be displaced during concreting
  •  Protective coating – prevents premature swelling of hydrophilic element whilst exposed and for 12 to
    18 days after casting to avoid spalling of fresh concrete
  •  Simple installation – fix and heat weld as conventional waterstops
  •  Comprehensive system – internal and externally placed sections complete with a range of factory
    fabricated junction pieces