Mapped to a shared offline runtime family and usable with a recording or compatible ESP32 CSI stream.
Intended capability
Pilot this intended outcome through the shared Through-wall presence family, then validate it against site-specific ground truth: Warns of dangerous accumulating load on flat roofs and ceiling voids — snow pack, ponding rainwater, burst-pipe pooling above a ceiling — from nodes mounted below.
This describes the intended outcome. Readiness is shared-family mapped, evidence is class C, and a catalog mapping or recording is not proof of this outcome at a real site.
Solution blueprint
See the environment before installing it.
This exact kit is one of 191 first-class designs. It includes geometry, objects, nodes, wording, scenarios, installation, limitations, and catalog-bound readiness.
No rendered revision is available yet.
Bundled recording
A related Frontier scene
This is one recorded vertical scenario. It is not separate validation of every capability in the catalog.
01 The physics
Two coupled observables: (1) accumulated water/snow is a dielectric layer on the roof deck — paths reflecting off or penetrating the deck acquire extra delay and attenuation scaling with water-equivalent depth (wet snow is strongly lossy at 2.4/5 GHz); (2) load physically deflects the deck, migrating the ceiling-reflection tap delay (mm-scale, integrable) and lowering its vibration modal frequency.
02 Shared processing path
Stage 1 CIR sparse recovery tracks ceiling/roof-deck tap delay + amplitude -> Stage 5 field reconstruction attributes attenuation to an overhead lossy dielectric layer and maps its lateral extent (where the ponding is) -> Stage 6 compartment Kalman fuses the dielectric and deflection channels, CUSUM alarms on accumulation rate -> Stage 2 modal-frequency shift provides load corroboration.
This is a capability design path. Components may be shared with other catalog entries; it is not presented as a unique algorithm.
03 Validation plan
Own-hardware: flat-roof mockup (or single-story test structure), staged water loading in 10 mm steps with load-cell ground truth; winter field pilot on one instrumented commercial roof against snow-depth sensor.
04 Commercial hypothesis
'Roof-collapse early warning from inside the building' — for big-box retail, warehouses, and schools in snow country; insurers subsidize it the way they subsidize water shutoff valves.