A house has new windows and the interior trim shows water staining beneath several of them. What should be considered?

Staining below new windows is genuinely ambiguous, and the exam is testing whether the candidate will say so. Two histories fit the same evidence. The windows may be leaking now because the flashing and sill pan were done badly during replacement, which is common in retrofit work where the cladding is not opened up. Or the staining may be old, caused by the original windows, left behind on trim that was never refinished after the replacement. A visual inspection cannot separate them: the flashing is concealed behind cladding and the trim, and staining does not carry a date. What the inspector can do is document the condition, state both possibilities, and recommend the client establish when the staining appeared and monitor for recurrence.

Both explanations fit the observation, and a visual inspection cannot determine which applies because the flashing is concealed and staining cannot be dated. Reporting the ambiguity, with a recommendation to determine the timing and monitor, is the honest and useful treatment.

Window replacement frequently leaves original interior trim in place, so pre-existing staining can survive the work. Retrofit installations also commonly have flashing deficiencies that are concealed behind cladding. Inspectors report observed conditions and identify what cannot be determined visually.

Two Stories, One Stain. A mark on trim does not say when it arrived. If both histories fit, write both — do not pick one to sound decisive.

Moisture-meter readings help here: elevated readings suggest an active leak, dry readings suggest historical staining. Note that the reading informs but does not conclusively date the staining.

• •Asserting a flashing defect that was never observed
• •Dismissing the staining as historical without evidence
• •Treating a manufacturer warranty as assurance against leakage