Preprufe 300R Plus membrane is unique composite sheet comprised of a robust HDPE film, an aggressive pressure-sensitive adhesive and a weather resistant protective coating. It is Designed with an dual adhesive ZipLap and featuring Preprufe's Advanced Bond Technology, Preprufe Plus delivers the time-tested value of Preprufe technology with enhancements to both performance and installation. The adhesive to adhesive ZipLap ensures that a robust lap can be achieved quickly and effectively in the field. In addition to efficiency gains associated with a kick-out roll design, Preprufe Plus is release liner free for an easier and faster installation with less waste on the job site. Unlike conventional systems which are vulnerable to water tracking between the unbonded membrane and structure, Preprufe's Advanced Bond Technology creates a permanent and integral bond to concrete which prevents ingress or migration of water into and around the structure.