Movement Joint

A movement joint is a designed gap or discontinuity in a structure or building element that allows controlled movement to occur without causing cracking, distortion, or loss of connection to adjacent parts. All building materials expand and contract with temperature change, swell or shrink with moisture variation, and deform under load. Where these movements cannot be accommodated within the stiffness of the element itself, a movement joint provides a release that allows the movement to occur harmlessly.

The types of movement joint most commonly encountered in building surveys are: expansion joints (which allow for thermal expansion, particularly in long runs of concrete or masonry), contraction joints (which control where shrinkage cracking occurs in concrete), isolation joints (which prevent differential settlement from transmitting loads between adjacent elements), and sliding joints (which allow horizontal movement in elements that are vertically restrained).

Movement joints are a common location for building defects. Sealants within movement joints deteriorate over time — hardening, cracking, debonding, or losing adhesion — and when they fail, water ingress follows. In façades, failed movement joint sealants are one of the leading causes of water penetration. In concrete structures, blocked or bridged expansion joints prevent the movement they are designed to accommodate, resulting in compressive stress in the concrete that can cause spalling or buckling.

In condition surveys, movement joints should be inspected and documented at each survey cycle. The condition of the sealant, the profile and cleanliness of the joint, and any evidence of blocked movement (adjacent cracking, spalling, or distortion) should be recorded. Severity ratings should distinguish between sealant that is deteriorating but still functional, sealant that has failed and requires replacement before water ingress occurs, and joint blockage that is already causing distress.

360° panoramic documentation is valuable at movement joint locations because it captures the full context of each joint: the condition of the sealant, the condition of the adjacent surfaces, and any distress patterns that indicate restricted movement.