All Purpose Foam Backer Rod For 3/4 Inch Expansion Joints, Gray Caulking Backing Strip 15 Feet Long Indoor Outdoor Weather Proof Sealant Gap Filler Built Like A Tank For Quick Fix Home Jobs

Durable gray foam backer rod for sealing expansion joints
✔️ Single roll gray foam backer rod measures 3/4 inch by 15 feet long

This gray foam backer rod rolls out ready to go right into your wall gaps, window frames, and concrete cracks. Builders and DIYers rely on it to create a clean backing layer before applying exterior grade sealant or interior caulk. It sits perfectly in place and stops drafts from sneaking through while giving new silicone a smooth surface that stays sealed for years.

✅ Weather resistant closed cell polyethylene foam core
✅ Cuts cleanly and fits handily into uneven joint edges
✅ Maintains shape without sagging across vertical seams
✅ Provides uniform depth control for heavy duty paintable caulk

💡 What makes a closed cell foam expansion joint filler actually stop drafts?

This handy backing strip does the heavy lifting by creating a reliable bond break before any sealer hits the seam.

- Dense polymer blocks wind and moisture from creeping behind siding boards - Tough skin holds its shape while sun beats down on outdoor decks - Guys love how it squishes into crooked seams without leaving gaps - Exact width matches standard caulk tubes so you get even coverage ✝️