I've seen the sagging issue too, but honestly, even with reinforcement, green roofs seem like a gamble long-term. My neighbor had one—looked great until a heavy storm turned it into a mini-swamp. Eventually switched back to metal and hasn't looked back since...
"looked great until a heavy storm turned it into a mini-swamp."
Had a similar experience on a job last summer—client insisted on a green roof, and even with extra drainage layers, heavy rain still pooled badly. Makes me wonder if it's more about slope or drainage design than just reinforcement alone...
Had a similar issue last year—my backyard shed roof pooled water every heavy rain. Added gutters, but didn't really help. Eventually realized slope was too shallow. Adjusted the angle slightly and problem solved, no more mini-swamp. So yeah, I'd say slope matters as much as drainage, especially for roofs that hold plants or extra layers.
"Makes me wonder if it's more about slope or drainage design than just reinforcement alone..."
Definitely agree with this. Reinforcement helps strength-wise, but won't fix standing water issues.
Yeah, slope definitely plays a bigger role than people realize. Had a similar headache with my garage extension—thought gutters would fix it, but nope. Water still pooled up after heavy rains. Eventually had to tweak the pitch just a bit, and that did the trick. Like you said:
"Reinforcement helps strength-wise, but won't fix standing water issues."
Exactly. You can beef up the structure all you want, but if the water's not moving, you're still stuck with a pond up there...
Fair points, but honestly, sometimes even a slight pitch adjustment isn't realistic—especially if you're dealing with an older structure or tight budget. I've seen cases where adding some tapered insulation under a new membrane roof did wonders for drainage without having to mess with the structural slope itself. Not always the cheapest fix, but it can save you from having to rebuild half your roof...
