Had a flashback reading this—my first attempt at a green roof was basically a “learning experience” (aka, I got a soggy ceiling). I skipped the pro waterproofing because I thought heavy-duty tarps would do the trick... they didn’t. Ended up redoing the whole thing with proper layers and those modular trays you mentioned. Not cheap, but way less stressful than chasing leaks every time it rains. If I ever do it again, I’m definitely budgeting for the right materials up front.
I skipped the pro waterproofing because I thought heavy-duty tarps would do the trick... they didn’t.
Curious—did you run into any issues with permits or inspections after redoing it with the modular trays? Around here, inspectors get pretty picky about drainage layers and roof load. Wondering if you had to upgrade your structure too, or just swap out the layers?
Curious—did you run into any issues with permits or inspections after redoing it with the modular trays?
Yeah, the inspector side-eyed my setup pretty hard once I swapped out the tarps for actual waterproofing. Had to show specs for the trays and prove the roof could handle the extra weight. Ended up reinforcing a couple joists—wasn’t as simple as just swapping layers, unfortunately. Learned the hard way that “it’ll probably be fine” doesn’t fly with city inspectors.
That’s pretty much my experience too. I thought swapping to trays would be a quick upgrade, but the city wanted every detail—weight calcs, drainage specs, you name it. My buddy joked I needed an engineering degree just to grow sedum up there. Ended up crawling around in the attic, sistering joists and double-checking everything. Honestly, the paperwork took longer than the install... but at least now I sleep better when it rains.
That sounds about right—paperwork always seems to drag out longer than the actual build. I get why cities want all those specs, but sometimes it feels like overkill, especially for a lightweight tray system. Still, you did the smart thing double-checking your structure. I’ve seen folks skip that step and regret it after a heavy rain or windstorm. At least now you know exactly what’s up there and can trust it’ll hold up. Peace of mind is worth a few extra headaches, in my book.