Vapor Barrier Nakal’Bun Elementary School

Environmental Containment


British Columbia (BC) School Board was aware of the potential of hydrocarbon-contaminated soil on the property prior to starting renovation at Nakal’Bun Elementary School in Ft. Saint James, B.C. The plan included building the new perimeter wall with a vapor/moisture barrier and a vapor barrier installed below the slab. The layout of the under-slab liner portion of the vapor management system was irregular, with many piles, pipes and columns protruding from the vapor barrier.

Solution & Insatllation

Layfield suggested the use of VaporFlex® Premium for its flexible thermoplastic copolymer with excellent flex-crack resistance and very high resistance to hydrocarbons, oils, and organic solvents. The outside perimeter wall had many corners, adding to an already challenging liner installation project. Layfield installed a Permax 700uv Polyurea spray-applied liner on the perimeter walls. For the below slab liner portion, nonwoven underlay was used to provide protection for the primary liner.  A 30 Mil vapor barrier was utilized for the under-slab portion of the vapour management system. Prefabricated panels were used to fit the odd-shaped layout of the building, and a SS mechanical detail was used to attach the liner to the concrete.

Features & Benefits

  • Hydrocarbon vapor containment and removal
  • High-performance liners for VMS applications
  • Design-build project assistance on Vapor Management Systems (VMS)


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