SikaProof® A+ 12

FPO sheet membrane for pre- and post-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. The total thickness is 68 mil. 

  • Dual bond: Full and permanent mechanical and adhesive bond with concrete structure
  • Can be used as a pre- and post-applied system
  • No lateral water migration between concrete and membrane 
  • Excellent barrier to radon
  • Fast and easy installation
  • High flexibility and crack-bridging capabilities 
  • High watertightness tested according to various standards
  • Resistant to aggressive conditions in natural ground water and soil
  • Temporarily resistant to weathering and UV exposure
  • Joints can be sealed using thermal jointing
  • Can be combined with other approved Sika® waterproofing / joint sealing systems