Those spots are often assumed to be a roof leak, but they may actually be condensation — frost accumulating on the underside of the roof deck in the attic, which then melts and stains the ceiling below.
How to tell a leak from condensation
A few questions usually point you in the right direction:
- Is there continuous dripping from one specific location?
- Does the dripping start and stop independently of temperature — even with snow sitting on the roof?
- Is it exclusive to winter, or does it also happen during rainy weather?
Continuous dripping from a fixed point, especially in rain, tends to indicate a true leak. Staining that appears in cold snaps and eases as temperatures rise often points to condensation.
Where condensation shows up
Condensation-prone areas include bathroom fans, attic hatches, and the spaces above window sills. Poor installation and inadequate insulation — common in kitchens, homes with flat roofs, and busy households that put a lot of moisture into the air — all contribute.
When to call A & G
Our seasoned team inspects thoroughly and recommends the most effective solution, whether the source is a genuine leak or attic condensation. If you're seeing winter ceiling stains in Orillia or Muskoka, call (705) 325-1805 and we'll help you get to the bottom of it.