Dictionary of Moisture Protection & Restoration

Incorrect

Correct

Joint Bondbreaker

Joint No Bondbreaker

MOVEMENT

MOVEMENT

This is an exaggerated illustration of the same joint where the sealant has been installed over the masonry without a bondbreaker. The result is a cohesive tear when the joint moves.

Proper joint treatment with bondbreaker tape installed. The fact that the sealant rides on the top of the bondbreaker (no three- sided adhesion) allows the sealant to work properly without a cohesive tear.

There are hundreds of sealant details but all of them should address the same principle: avoid three-sided adhesion. Three-sided adhesion is the cause of the majority of transition joint failures in rehabilitation projects.

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