Had a leak once that I swore was coming from a window, but after tearing half the drywall out, turned out it was running along a ceiling joist from a cracked vent boot on the roof. Ever try tracing water in an old house? It’s like chasing a ghost. Those cameras are cool, but yeah, not worth it unless you’re always fixing leaks.
Tracing water intrusion is one of those things that looks simple on paper but gets complicated fast, especially in older homes. Water will follow the path of least resistance, and with all the weird angles, old framing, and sometimes questionable renovations, it can end up showing up somewhere totally unrelated to the actual leak. I’ve seen cases where water entered at a chimney flashing, traveled along a rafter, and finally dripped out in a closet on the opposite side of the house.
Thermal cameras are handy, but like you said, unless you’re dealing with leaks all the time, it’s hard to justify the cost. Sometimes I find a good moisture meter and a lot of patience does the trick. Out of curiosity, did you notice any staining or musty smell before you started opening up the drywall? I’ve found that sometimes the first clue is actually a subtle odor rather than visible damage. Wondering if anyone else has had luck using other low-tech methods to narrow down the source before going full demo...
Had a similar mess last fall—thought the water was coming from a busted pipe, but nope, it was sneaking in behind some old siding and traveling along the baseboard. No stains or smell at first, just soggy carpet in one corner. I ended up using paper towels taped to the wall in a few spots (real high-tech, I know) to see where they got damp first. Not perfect, but it helped me narrow it down before tearing into anything. Water's got a real talent for playing hide and seek...
Water’s sneaky for sure. I’ve seen it travel a good ten feet from where it actually gets in before showing up as a wet spot. One thing I’ve tried is running a garden hose on different sections of siding or roof, starting low and working up, to see where the leak starts. It’s not foolproof, but sometimes you get lucky and spot a drip right away. Paper towels are underrated, honestly—cheap moisture detectors.
- Definitely agree—water loves to find the weirdest path possible.
- Hose test is solid, but sometimes you gotta wait a while for the leak to show. Seen cases where it took hours for the inside to get damp.
- If you’ve got attic access, try crawling up there with a flashlight after a rain. Look for dark streaks or even tiny spiderwebs—they’ll collect water droplets.
- Paper towels are handy, but I’ve had luck with blue painter’s tape too. Stick a bunch along seams and check which ones get wet.
- Not every leak starts at the obvious spot. Flashing and nail holes are sneaky culprits, especially after storms.