Staining is a timeline
A ceiling stain is not just a mark — it is a record of water that has travelled somewhere it should not be. The critical questions are whether it is old or active, and where it came from. Fresh paint over a stain is the most common cover-up in residential property.
In an inspection we look at the stain, the area around it, and what sits above or behind it: roof covering, flashing, valley, bathroom above, or a service penetration.
Efflorescence and salt attack
White powdery deposits on brickwork indicate moisture moving through masonry and evaporating. Below damp proof course level, it often points to raised soil, blocked drainage or a failed damp course.
On coastal properties, salt attack also causes brick faces to friar and mortar to erode. It is a slow process that becomes expensive when it reaches the base of the wall.
The subfloor tells the truth
Damp soil, water staining on piers, corroded ant caps and musty odour under the floor are all evidence that water is arriving and not leaving. Poor cross-ventilation keeps it there.
This matters beyond the timber itself. Persistent subfloor moisture is the single most reliable predictor of future timber pest activity.
Drainage you cannot see from the door
Downpipes that discharge at the base of the wall, ag drains that have silted up, and paths that fall towards the house all direct water into the footings. None of it is visible from the front garden.
Fixing these is usually inexpensive. Ignoring them for a decade is not, particularly on reactive clay soils.
Written by Accurate Building Inspections. This article is general information about property inspection in NSW and is not a building inspection, pest inspection, engineering assessment or legal advice. A visual inspection cannot guarantee the absence of concealed defects.