Treat sagging ceilings seriously
A waterlogged ceiling can become unstable. Keep people out of the area beneath a bulge or sag and do not puncture the surface. Seek qualified help to assess the risk and the source of the water.
Look for the source—not just the mark
Water can travel from a roof, plumbing line, bathroom, window or exterior opening before it appears on a wall. Tell a provider about recent leaks, rain, plumbing work or recurring dampness.
Ask how materials will be evaluated
The appropriate response depends on the type of material, extent of moisture and possible contamination. Ask which materials can be dried in place, which may need removal and how the recommendation will be documented.
Avoid covering the evidence too soon
Painting over a stain or closing a cavity before addressing the moisture source may conceal a problem rather than resolve it. Ask for an explanation of the proposed sequence of work before repairs begin.