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What would you do if your flat roof kept leaking but you couldn’t find the source?

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architecture_charles4760
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I get the appeal of thermal imaging—tech is cool and it definitely has its place. But I can’t help but wonder if we’re sometimes just treating the symptom instead of the cause, especially with these old flat roofs. I’ve been down the rabbit hole with leaks on my own place (EPDM, about 18 years old, Midwest weather), and after chasing a few phantom drips, I started questioning whether patching or pinpointing was even worth it anymore.

Here’s where I’m coming from: even if you find the exact wet spot, what’s stopping water from finding another path next season? Flat roofs are notorious for this. I ended up biting the bullet and retrofitting mine with a green roof system—just a basic sedum mat, nothing fancy. It added some weight, sure, but it’s been a game changer in terms of both insulation and leak prevention. Plus, it protects the membrane from UV and hail, which seems to be half the battle.

I know not everyone’s up for that kind of project, but honestly, I feel like investing in a longer-term fix (even if it’s just adding a protective layer or redoing the membrane) can save way more hassle than renting gadgets every year. Not to mention, you get some bonus curb appeal and stormwater management out of it.

Thermal cameras are clever for diagnostics, but unless you’re planning to keep patching forever, maybe it’s worth thinking about a more holistic upgrade. Just my two cents—sometimes the tech solution feels like putting a Band-Aid on something that needs stitches. Anyone else tried going the green route or am I just a glutton for punishment?


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hollyb57
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- Totally get where you’re coming from. Chasing leaks on a flat roof feels like playing whack-a-mole sometimes.
- I went with a green roof too (just a thin sedum layer, nothing wild) and honestly, it’s been way less drama since.
- The insulation boost is real—my upstairs is noticeably cooler in summer.
- Only thing I’d flag: make sure your structure can handle the extra weight, especially after heavy rain.
- I still keep a thermal camera around for peace of mind, but yeah, I’d rather invest in something that actually prevents the problem instead of just finding it over and over.


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hannahartist
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I went with a green roof too (just a thin sedum layer, nothing wild) and honestly, it’s been way less drama since.

That’s interesting—I've managed a few buildings where folks tried the green roof route. It definitely seems to cut down on some of the usual headaches, but I’ve also seen it go sideways when the drainage isn’t up to snuff. One place had pooling issues after a big storm and it actually made the leaks worse until we sorted out the runoff.

I’m curious, did you have to beef up your structure at all before adding the sedum? I’ve always wondered how much extra weight those “light” systems really add once they’re saturated. Some of our older flat roofs weren’t built for anything more than basic gravel and membrane.

The thermal camera idea is smart—never thought about using one for leak detection, but I guess it’d help spot cold spots or moisture under the surface. Have you found it actually helps pinpoint leaks, or is it more just for peace of mind?

One thing I’ve noticed: sometimes leaks on flat roofs aren’t even from above. Had a case where water was getting in through an old parapet wall and running down between layers. Took forever to trace because everyone kept patching the roof itself. Ever run into anything like that? Flat roofs really do have a mind of their own...

If you had to do it over, would you still go with the green roof or try something else? I’m always weighing whether it’s worth recommending to owners, especially in places with heavy snow or rain.


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That’s reassuring to hear you’ve had less drama with the sedum layer. I’ve been on the fence about green roofs for exactly the reasons you mentioned—weight and drainage just seem like a lot to gamble on, especially with an older house. The thermal camera thing is clever, though. I’d never have thought of that either, but if it helps even a little, it’s probably worth it. And yeah, those sneaky leaks from parapet walls or weird spots are the worst... makes me feel like I’m chasing ghosts half the time. If you’re happy with your setup now, that’s a good sign for folks like me who are still figuring out what’s worth the hassle.


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bvortex30
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Weight and drainage really are the big sticking points with older homes, I get it. I hesitated too, but honestly, once I saw how much cooler my attic stayed after trying a basic sedum layer, it felt worth the risk. Leaks are still a headache now and then—parapet corners especially—but at least thermal imaging narrowed things down for me. If you’re on the fence, maybe try a small test patch? Sometimes just seeing it in action helps sort out the nerves.


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