Exterior sealant joints are expected to remain intact for 15–20 years while withstanding
building movement, temperature extremes, UV radiation, bulk water exposure, and pressure differentials. One of the most underappreciated components in meeting that standard is the closed-cell foam backer rod. When backer rod is omitted or improperly installed, movement stressors — building settling, thermal cycling, and material temperature differential — become leading contributors to premature adhesive or cohesive sealant failures.
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Why Backer Rod Is Critical to Sealant Joint Performance
