Roof-truss uplift: seasonal ceiling-wall cracks
Distinguish seasonal truss uplift from wall/foundation movement before rigidly fastening or patching.
VERT / GREEN
Photograph the crack winter/summer and note whether it closes seasonally.
JAUNE / YELLOW
A ceiling-partition crack that opens in winter and closes later can result from differential truss shrinkage.
ROUGE / RED
Progressive deformation, sagging ceiling, shifted bearing wall or non-seasonal crack: assess structure rather than assume truss uplift.
Quick triage
What the professional checks
The professional checks trusses, moisture, bearings, partitions, fasteners, cracks and signs distinguishing seasonal shrinkage from structural movement.
Official sources
Checked 2026-08-23
Related path
Continue with the right tools
These links connect this page to the next useful checks and decisions without repeating the full content.
Connect symptoms to the enclosureStart from condensation, staining, odours or movement before choosing a repair.Open →Adapt the enclosure to climateConnect heat, cold, water, wind and wildfire to building priorities.Open →Assess overall resilienceReview water, climate, safety, autonomy and records with a local score.Open →Screen hazardous materialsIdentify situations where work should stop and testing is needed before disturbance.Open →Open climate guidanceReview climate constraints relevant to assemblies and materials.Open →
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