Attic frost: source opening versus frost field
Warm moist indoor air can enter through one small ceiling opening, spread through the attic and freeze across a much larger roof-deck area.
HouseSymptoms
Visual Atlas
Original explanatory diagrams for seeing how a healthy route differs from a hidden failure path. Every plate now includes a guided evidence pathway, live investigation session, four-phase verification loop and owner-controlled resolution review.
13 original plates
39 competing hypotheses
26 decision points
13 live session schemas
52 verification checkpoints
78 resolution gates
Crawl-space moisture: ground vapor, outdoor humidity and leakage
Compare moisture rising from soil, warm humid outdoor air condensing on cool surfaces and a focused plumbing leak.
Basement water: surface runoff, soil pressure and plumbing
Compare three pathways that can create similar floor-level water: exterior runoff, saturated soil at a crack or joint, and an interior plumbing source.
Odor transfer: source location versus pressure pathway
A fan, return duct or closed door can pull odor from a drain, crawl space or wall cavity into a room far from the source.
Thermal bridge condensation: cold line versus moving air
Compare a stationary cold bridge through framing with an actual air leak that carries a detectable draft.
Efflorescence: deposit location versus water route
White mineral deposits mark where water evaporated; they do not identify the original source without the surrounding moisture pattern.
Material drying: surface improvement versus trapped moisture
A dry-looking surface can hide a slower moisture gradient deeper in insulation, wood or layered finishes.
Roof water paths: drainage versus hidden entry
Compare a normal shingle-to-gutter route with water that crosses a failed flashing or underlayment detail and appears far from the entry point.
Window water management: face seal versus drainage plane
See why a sealed exterior joint is only one layer of defense and how head flashing, side laps and a sill pan redirect water back outdoors.
Drain pressure: normal venting versus trap disturbance
See how a vented drain admits air above the roof and how a restriction can pull or push air through nearby fixture traps.
Shower leak paths: splash, drain, supply and waterproofing
Separate four overlapping shower-related routes by changing one operating condition at a time.
Electrical heat: normal load versus resistive connection
Compare normal current through an intact connection with localized heat caused by a loose, damaged or overloaded contact.
Crack geometry: finish separation versus structural movement
Compare a stable surface joint crack with movement that creates diagonal geometry, offset or repeated reopening.
