What is crack bridging?

Crack bridging refers to the ability of a coating or resin to span across a crack and remain intact even if the crack widens or moves due to thermal expansion or structural settling. 'Static' crack repair materials (like epoxy) will snap if the crack moves. 'Dynamic' crack bridging materials (like flexible PU resins or elastomeric coatings) stretch to accommodate the movement, maintaining the waterproof seal. Selecting the right elasticity is vital for long-term success.