Volume: Updated vapor barrier on four car doors. I used about 20 strips or less. Critical Notes: The box was obviously carelessly stored. Looked crumpled, the edges of the box were frayed. The wax paper separating the striped shells stuck to the seal like an old sticker and was sometimes difficult to remove. The sealant was all glued together so I used an Xacto blade to separate the pieces. When installed on a warm day, the strips sagged and sagged with handling, making them slightly thinnerβ¦