Backer rods are usually round, flexible lengths of foam used to fill cracks and gaps between building materials. It is used in a wide range of applications including:

• tiling
• flooring
• window paneling
• stoneware

This 2 1/2 Inch backer rod:

• Allows Easy Control of Sealant Application Thickness
• Won't Adhere to Sealants; No Bond Breaker Needed
• Compatible with All Cold-Applied Sealants