VERT / GREEN
Photograph ridge/roof lines and measure safe reference points.
Sagging roof: rafters, ridge and supports
Read roof geometry, loads, supports and past alterations before jacking or concealing sag.
This tool is for triage and documentation; structural, fire, gas, refrigerant and electrical work remains subject to applicable rules and professionals.
JAUNE / YELLOW
Old stable sag differs from recent movement caused by snow, moisture, cut framing or support changes.
ROUGE / RED
Recent movement, split/decayed wood, altered truss, overloaded roof or spreading wall: engineer/pro and safety management.
Indicative triage
Useful tools and data
- Roof-line photos
- Reference/elevation measurements
- Snow/leak/alteration history
What the professional checks
- Assess framing/load path
- Distinguish stable/active deformation
- Define shoring/strengthening if required
Official sources
Sources checked / sources vérifiées: 2026-08-22
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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