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Also to know is, what is backer rod material?
A backer rod is a cylindrical type 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 and stoneware among others. They ensure that the sealant only bonds with the building material hence preventing triple bonding.
Additionally, do I need backer rod? It's necessary in order to provide the proper joint design – caulking or chinking adhering to only the sides of the joint, not the back where the backer rod is placed. This allows the product to stretch correctly.
Considering this, what does backer rod look like?
QUIKRETE® Backer Rod is an extruded round, closed cell, low density polyethylene foam material with a skin-like outer texture. It is highly flexible and compressible for easy installation. QUIKRETE® Backer Rod is chemically inert and will resist oil, gasoline and most other solvents.
How do I know what size backer rod to get?
Standard practice for closed-cell backer rod is that with joints less than 3/4 inch (19mm) wide, the backer rod diameter should be 1/8 inch (3mm) larger than the joint width, and with joints 3/4 inch (19mm) or larger, the backer rod diameter should be around 25%-30% larger than the joint width.