When you see water stains on the ceiling, together with plastic Tupperware, you know there’s likely an active roof leak! Of course, I use very expensive equipment to confirm (e.g., moisture meter and infrared thermography camera), but this one was obvious. With water intrusion, there’s always the possibility of underlying damage not visible without invasive inspection; it wouldn’t hurt to open the ceiling and look for possible mold growth. This was discovered at a recent home inspection on Orcas Island in the San Juan Islands.
Roof Help.com says, “There can be many reasons for a leak. Leaks can be the result of poor roof system installation, mechanical damage such as dropped screwdrivers or knives, plugged roof drains, roofing material failure, HVAC problems; the list goes on. The source of a leak can be quite distant from where it actually shows up…Chasing a leak isn’t always as easy as it would appear to be. When trying to locate a leak, use the following guidelines to assist you.”