Start with conditions, not a product
Discoloration on rafters or decking is a symptom, not a diagnosis. Before anything gets opened up, the real moisture path — a roof leak, poor ventilation, or ongoing condensation — needs to be pinned down.
Build a complete scope
- What is keeping it wet, identified before the cleaning is costed
- Whether cooled surfaces meeting humid air explain it without a leak
- The barrier around the work and how air leaves it
- What is removed versus cleaned in block or plaster construction, and why
- Verification afterward, and the humidity-control fix that prevents a repeat
St. Petersburg context
Attics in St. Petersburg's older bungalow stock often carry original, undersized ventilation, and brick-and-masonry construction in districts like Old Northeast holds heat differently than the CBS ranches built decades later. Salt-tinged bay air adds to attic humidity even well away from the immediate waterfront.