APPLICATIONS: Vapor Barrier Fasteners are used for mounting and securing a plastic moisture barrier to the foundation walls and pillars in the crawl space. Can also be used for automotive repair applications. SPECIFICATIONS: Vapor Barrier Fasteners are approximately 1 inch long. Actual dimensions are 22.7mm in length by 7.5mm in width with the diameter of the cap measuring 18mm. INSTALLATION: Drill a hole, using a 1/4" masonry bit or smaller, into the wall and then attach wall liner with christmas tree fastener. SEAM AND SEAL: Using Butyl Tape or Vapor Barrier Tape really helps for a sealed and secure vapor barrier. FOR THAT FINISHED LOOK: When encapsulating a crawl space, consider using capped vapor barrier stakes as well. Vapor Barrier Fasteners are used for securing vapor barrier to the foundation walls and pillars in the crawl space. Vapor Barrier Fasteners are 1 inch long. Drill a hole - usually a 1/4" masonry bit or smaller - into wall and then attach wall liner with fastener. Using Butyl Tape or Vapor Barrier Tape really helps for a sealed and secure vapor barrier. When encapsulating, consider using Capped Vapor Barrier Stakes as well! Size of Masonry Bit - 1/4 inch or slightly smaller is okay to use.