Sashco Pre-Caulking Filler Rope Backer Rod Roll, 100' Length x 3/8" Width, Grey

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 3/8-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

Sashco Sealants Pre-Caulking filler rope (Backer Rod). Makes professional joints that last. Helps fill in and insulate large caulk joints and allows the caulking to absorb more movement. Fills the joint so you use less caulk. Fully compatible with all substrates and sealants. Use behind chinking and caulking. Essential for ideal joint design.Caulking adheres to the sides of the joint, but not to the filler rope, which allows the caulking to stretch and compress without tearing or pulling away thus extending the caulk's life and effectiveness. Made of closed cell poly foam. Minimum R value of 2.5/inch. Available in gray color. Measures 3/8-inches diameter by 100-feet length.
Brand: Sashco, Model: 30381, Color: Grey, Size: 3/8"