Standard Backer Rod is an ideal non-absorbent compressible material inserted into a joint to control sealant depth. It creates a backstop to allow for proper sealant tooling. Backer Rod is commonly used in glazing operations, window and door applications, expansion joints, curtain wall joints, partitions, log construction, pavement joints and repair, and precast units and copings among many other job applications. Standard Backer Rod is an extruded round, closed cell, low-density polyethylene foam material with a skin-like outer texture. It is highly flexible and compressible for easy installation; however, it is important to make sure that one does not puncture, stretch, or overly compress Backer Rod.