Backer Rod is an ideal non absorbent compressible backup material inserted into a joint to control sealant depth, create a backstop to allow proper sealant wetting of the joint surfaces, and yield proper bond breaker between the backup material and the sealant. It can also be used as a temporary joint seal.
Commonly used in glazing operations, window and door applications, expansion joints, curtain wall joints, partitions, log construction, pavement joints, and repairs, precast units and copings.
Backer Rod is compatible with butyl, polysulfide, acrylic, polyurethane, silicone and most other cold sealant compositions.
Composition and material:
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.
Backer Rod is chemically inert and will resist oil, gasoline and most other solvents. This material will not stain nor adhere to sealant materials and is non-exuding.
Joint or opening must be clean, dry and free of obstructions. Using Table I, select proper rod diameter and cut to length or use directly from spool. With a blunt instrument or roller, uniformly install rod at the level recommended by the sealant manufacturer, specifier or architect involved. Generally, the depth of the joint after the backer rod is installed is one half the width. Very large and very small joints vary in terms of this depth to width ratio. (do not puncture, stretch or overly compress)