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SikaProof A+ 1m x 20m Roll

SikaProof A+

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FPO sheet membrane for pre-applied fully bonded below ground waterproofing

SikaProof® A+ 12 is a polyolefin (FPO) based sheet membrane for below ground waterproofing of reinforced concrete structures. It is loose laid onto prepared substrates or formwork before fixing reinforcement and casting concrete. A special hybrid bonding layer on the membrane forms a permanent bond with the fresh concrete. Overlap joints are sealed using cold-applied tapes or by thermal jointing. Thickness 1,2 mm. Suitable for use in hot and tropical climatic conditions.


Damp-proofing, waterproofing and concrete protection for basements and other below ground concrete structures against ground water ingress. Suitable for use on:
  • Reinforced concrete base slabs
  • Reinforced concrete walls with single and double-faced formwork
  • Extension and reconstruction works
  • Prefabricated structures


  • Pre-applied: Fixed before placing reinforcement and casting concrete
  • Dual bond: Mechanical and adhesive bond with fresh concrete
  • Fully and permanently bonded to the reinforced concrete structure
  • No lateral water migration between the concrete structure and the membrane system
  • High watertightness tested according to various standards
  • Easy to install with fully adhered joints
  • Cold-applied or thermally jointed
  • Temporarily resistant to weathering and UV exposure during construction
  • Resistant to aging
  • High flexibility and crack-bridging capabilities
  • Resistant to aggressive conditions in natural ground water and soil
  • Can be combined with other approved Sika® Waterproofing / Joint Sealing Systems