Mark one segment
Do not move between different branches of the crack when comparing width.
House Observatory · Instrument 01Crack
Crack
Tracker
Build a repeatable crack record from width, date, location and change instead of relying on memory.
Core principleA single width is context. Repeated measurements reveal direction, pace and whether movement has stabilized.
+0mm recorded change
Average rate0 mm/day
Interval30 days
Current0.4 mm
The recorded difference is small enough that measurement repeatability may be as important as movement.
Next useful recordRepeat at the same marked point and photograph the scale, endpoints and surrounding opening or finish.
The trend is the evidence.
No locally saved observations yet.
Photograph the context
Include the whole opening or wall, then the scale and exact point.
Track companion symptoms
Door binding, floor change and related exterior cracks can alter the priority.
Preserve uncertainty
The tracker measures change; it does not identify the structural cause.
