SPAX Tape is a self-adhesive cover tape made of foam rubber that effectively protects the wooden substructure of decking from rainwater. With SPAX Air, additional strips or separators can be created under decking in order to provide better ventilation. That’s because the constant presence of moisture, sometimes referred to as "waterlogging", can cause the wood to rot. With SPAX Air, there’s now an easy way to separate the planks from the substructure, which ensures better ventilation. At the same time, SPAX Air ensures the boards are properly and evenly spaced and greatly simplifies assembly to boot.