Round Pre Caulking Closed Cell Backer Rod Roll One Quarter Inch Diameter Fifty Feet Grey For Large Caulk Joints Water Repellent Lets Caulk Move With Expansion Insulates And Guards Joint ASTM C1330 Type C

Round Pre-Caulking Backer Rod 1/4 in, 50 ft, gray
✔️ 1/4 in dia, 50 ft length, closed-cell, water repellent

This round backer rod is a closed-cell foam filler used behind caulk joints to seal gaps, insulate, and allow movement as joints expand and contract. It's ideal for large caulk joints, chinking, and exterior sealant work.

✅ Closed-cell poly foam filler rope that helps seal and protect joints
✅ Resists water absorption to shield joints from moisture
✅ Meets ASTM C1330, Type C standard for backer rods
✅ Gray color, compatible with substrates and sealants
✅ Helps caulk move with expansion and reduces caulk usage

💡 What is a backer rod used for in caulking joints and why choose closed-cell foam? This handy filler helps create better, longer-lasting seals.
- Regular use ensures proper caulk depth and joint performance.
- Closed-cell foam resists moisture and supports movement in expansion joints.
- It reduces the amount of sealant needed and extends joint life.