TamSeal 800 – High performance polymer waterproofing membrane

TamSeal 800 is a high performance, single component EVA polymer, flexible waterproofing membrane. In large applications, TamSeal 800 can be spray applied using a dry rotor machine by hand or robotic spraying. For smaller applications it can be applied by brush. TamSeal 800 provides a tough, durable, seamless, waterproofing membrane for many structures including tunnels, shafts and caverns.

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Key Benefits
  • Fast and easy application particularly for complex underground geometries.
  • Waterproof: zero penetration beyond membrane when tested in accordance with BS EN 12390-8:2000.
  • TamSeal 800 is safe, non-toxic and should be handled as per other cementitious construction materials.
  • Excellent adhesion, bond to concrete and steel of 1.5MPa or greater when tested in accordance with BSEN ISO 4624:2003.
  • When sandwiched between layers of concrete, the double bond (Example: To the primary concrete substrate and overlying secondary concrete) enhances the waterproofing performance.
  • Tough and flexible and suitable for use with steel fibre sprayed concrete.
  • Fast initial curing time, tack free in 2 to 3 hours.
  • Fast complete curing time, can be over-coated with concrete after 24 hours.
  • Exhibits excellent crack bridging capabilities when tested in accordance with BS EN 1062-7: 2004, with capacity proportional to thickness and 150% elongation when tested against ASTM D412-06a.
  • TamSeal 800 is non-ignitable: Class E when fire tested against BS EN ISO 11925-2, single-flame source test.
  • Unlike conventional coatings, which require the concrete to cure for 7 – 28 days, TamSeal 800 can be applied to 24 hour old concrete to give immediate protection.
  • Can be connected to other waterproofing materials with standardised joint details.


Typical Applications

TamSeal 800 can be applied to a multitude of substrates and works most efficiently between two layers of structural concrete lining, in such situations as:

  • Sprayed concrete tunnel and shaft linings
  • Diaphragm wall and contiguous pile boxes
  • Underground basements
  • Sprayed concrete caverns
  • Protecting concrete against aggressive water ingress in mines and excavations
  • Water retaining structures
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