Crawl-space moisture: ground vapor, outdoor humidity and leakage investigation session

Crawl-space moisture: ground vapor, outdoor humidity and leakage

Log outdoor dew point, crawlspace temperature, relative humidity, ground condition and plumbing state at repeatable times.

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.

Warm humid outdoor air cooling in the crawlspace

Outdoor air enters, cools and raises surface relative humidity or condensation risk.

Raises fit +2 eachWorse in warm humid weatherCold surfaces wet firstNo single liquid-water source

Lowers fit −2 eachLocalized wetting below a pipe

Notes for this route

Ground moisture or capillary vapor load

Exposed soil or wet perimeter ground supplies persistent moisture to the crawlspace.

Raises fit +2 eachMoist soil or missing ground coverBroad persistent humidityWorse after soil saturation

Lowers fit −2 eachHumidity falls while a local leak continues

Notes for this route

Local plumbing or drain leak

A supply, waste or condensate route creates concentrated wetting independent of seasonal air.

Raises fit +2 eachLocalized wet areaWater-use relationshipRepeats in dry weather

Lowers fit −2 eachUniform seasonal moisture across the space

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 wetting broad and seasonal or concentrated below one service route?

YesNoUnknown

If yes: Broad seasonal wetting favors air or ground vapor; local wetting favors plumbing.

If no: Improve spatial measurements before selecting a pathway.

Observed answer and evidence

Does outdoor dew point predict the crawlspace humidity rise?

YesNoUnknown

If yes: Treat warm-weather air exchange as a leading mechanism.

If no: Check ground and liquid-water sources.

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 enter confined crawlspaces with poor air quality, standing water or unsafe access.
Stop if sewage, electrical hazards, animals or structural instability are 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

Crawl-space moisture: ground vapor, outdoor humidity and leakage

Record the condition before interpreting it.

Mark what raises or weakens each route.

Warm humid outdoor air cooling in the crawlspace

Ground moisture or capillary vapor load

Local plumbing or drain leak

Change one condition at a time.

Is wetting broad and seasonal or concentrated below one service route?

Does outdoor dew point predict the crawlspace humidity rise?

Stop signals override scoring.

Explain what changed the ranking.

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