Roof and attic observatory
Follow rain, snow, indoor air and heat through roofing, flashing, roof deck, insulation and the ceiling plane.
See where rain, plumbing water, vapor and capillary moisture can enter, travel, collect and dry.
Roof covering
The primary shedding surface and first weather exposure.
Open connected dossier →Same building. Different hidden stories.
Watch the pathway unfold
Each simulation separates trigger, transport route, visible symptom and verification.
Warm indoor air becomes attic frost
Air leakage carries indoor moisture into a cold attic where it freezes on roof sheathing and later melts.
Wind-driven rain passes a flashing interface
Rain pressure and direction expose a roof or wall junction that remains dry during calm vertical rain.
Bathroom exhaust discharged into the attic
A disconnected or intentionally terminated duct delivers concentrated warm moisture to cold attic materials.
Chimney flashing admits side-driven rain
Step flashing, counterflashing or masonry interfaces allow water to enter during particular wind directions.
Ice dam backs meltwater under roofing
Snowmelt flows to a cold eave, refreezes and creates a reservoir that can move under roof coverings.
Wet insulation hides a roof leak after rain stops
Insulation stores water and releases it slowly, separating the visible drip from the weather event.
Wind washing reduces insulation performance at the eave
Outdoor air moves through or over low-density insulation, cooling the ceiling edge and altering attic moisture patterns.
See what the layer does to the material
Materials record exposure differently. Their response can reveal a pathway without proving the source.
Gypsum board after a hidden leak
Paper facings stain and soften while the core loses strength if saturation persists.
brown rings, sagging, soft edges and paper separation → ▧WoodWood under long-term wetting
Repeated wetting changes moisture content, dimensions, surface condition and eventually biological durability.
swelling, checking, staining and decay risk → ▧BrickBrick under persistent saturation
Absorptive masonry stores water, changes drying direction and increases salt and frost exposure.
darkening, efflorescence and face spalling → ▧Cellulose InsulationCellulose insulation after roof water entry
Dense fibers store and spread water, delaying visible drips and drying.
matting, delayed stains and persistent elevated moisture → ▧Spray FoamClosed-cell foam concealing a leak route
Low-permeance foam can redirect water and limit inspection of the substrate behind it.
water emerging far from entry and hidden sheathing condition → ▧ConcreteConcrete carrying dissolved salts
Moisture moves through pores and leaves crystalline deposits as it evaporates.
white deposits, tide lines and coating failure → ▧GlassInsulated glazing after seal failure
The cavity moisture load overwhelms desiccant and produces internal haze.
between-pane fogging and mineral marks → ▧Laminate FlooringLaminate flooring after a local leak
Fiber-based cores swell at joints and rarely return to their original shape.
raised seams, edge swelling and surface tenting →The diagram suggests routes.
The real trigger decides.
Describe what changed, where it happened and what weather or operating cycle came first.
