Window water management: face seal versus drainage plane investigation session

Window water management: face seal versus drainage plane

Mark the first wet edge around the opening and compare wind direction, sill drainage, head flashing and the wall drainage plane.

Browser-local draftNo session answers are sent to the server. Evidence balanceScores organize observations; they are not probabilities. No repair authorizationStop signals override the ordinary workflow.

Freeze the evidence

Record the condition before interpreting it.

Observed at Weather / equipment / water-use state First visible, audible or measurable change Location, direction and delay

Evidence ledger

Mark what raises or weakens each route.

Leave unknown items unmarked. Contradictory observations are useful evidence.

Failed flashing or reverse lap

Water reaches the opening and is directed behind the window or wall layer by an incorrect lap.

Raises fit +2 eachFirst wetting at the head or upper cornerWind-driven rain dependenceWater appears behind trim

Lowers fit −2 eachOnly wets at an interior condensation line

Notes for this route

Blocked or missing sill drainage

Water enters the window system but cannot drain safely back to the exterior.

Raises fit +2 eachWetting starts low at the sillDrain slots are blocked or absentLong rain duration matters more than wind

Lowers fit −2 eachFirst wetting begins above the head

Notes for this route

Interior surface condensation

Indoor humidity condenses on a cold frame or glass edge without rain crossing the wall.

Raises fit +2 eachCold-weather and humidity linkMoisture forms on the room-side surfaceNo exterior rain dependence

Lowers fit −2 eachWater emerges from behind trim during wind-driven rain

Notes for this route

Decision points

Change one condition at a time.

An answer changes investigation order; it does not prove a concealed condition.

Is the first water on the room-side surface or emerging from behind trim?

YesNoUnknown

If yes: Surface wetting favors condensation; concealed emergence favors a wall or window drainage defect.

If no: Repeat the observation during a controlled weather event and mark the first edge.

Observed answer and evidence

Does wind direction change the severity?

YesNoUnknown

If yes: Prioritize head, jamb and cladding transitions exposed to that direction.

If no: Check sill drainage, duration effects and indoor humidity.

Observed answer and evidence

Safety interlock

Stop signals override scoring.

Mark the stop state when any listed boundary is present. Do not create a better clue by increasing exposure.

Do not remove cladding or window units without a weatherproofing plan.
Stop destructive testing where lead paint, asbestos or structural damage may be present.

A stop signal is presentPause ordinary investigation and arrange an appropriate competent or emergency response.Safety note

Current conclusion

Explain what changed the ranking.

Leading pathway and why Strongest competing pathway Evidence still missing Smallest safe next action / handoff

Window water management: face seal versus drainage plane

Record the condition before interpreting it.

Mark what raises or weakens each route.

Failed flashing or reverse lap

Blocked or missing sill drainage

Interior surface condensation

Change one condition at a time.

Is the first water on the room-side surface or emerging from behind trim?

Does wind direction change the severity?

Stop signals override scoring.

Explain what changed the ranking.

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