Before repairing a stair-step crack in masonry

Do not start with the cosmetic finish

Stair-step cracking follows mortar joints and may reflect settlement, thermal movement, corrosion, poor support or historic movement. Width, displacement and change determine urgency.

Define the repair question

Ask which layer failed, what trigger activates it, how far the pathway may extend and what evidence will show that the source—not only the visible mark—was addressed.

Preserve a baseline

• Photograph with scale
• Measure at fixed points
• Record nearby door, window and drainage conditions
• Keep one dated overview photo and one close view from the same position.
• Record the trigger state before work begins.

Scope questions worth asking

• Which competing cause was considered and what evidence weakened it?
• Which concealed layers may need access and which will remain untouched?
• How will wet or damaged material be assessed before closure?
• What comparable post-work condition will be used to verify the result?

Avoid the common shortcut

Do not repoint before documenting movement; cosmetic repair can hide progression.

Escalation boundary

A structural or masonry professional should assess changing, displaced or widespread cracks.