Makes professional joints that last
Helps fill in and insulate large caulk joints and allows the caulking to absorb more movement
Closed cell design repels water to help protect the joint from damage
Complies with ASTM C 1330, Type C
Measures 1/2-inches diameter by 100-feet length
Easy to fit - soft and pliable so it fits into the joint easily
Water resistant - unlike open cell backer rod, it repels water to help protect the joint from damage
Fills the joint so you use less caulk
Fully compatible with all substrates and sealants