Frustrated trying to pick roof decking materials

I've dealt with both materials on various properties, and honestly, OSB isn't as bad as some horror stories suggest - provided it's properly installed and ventilated. Plywood does handle moisture better long-term, but if budget's tight, OSB with good roofing underlayment can still perform well.

I've seen OSB hold up surprisingly well too, but honestly, I'm still a bit skeptical about recommending it outright. Sure, if you're tight on cash, OSB with a solid underlayment can do the job - at least for a while. But I've had a couple of experiences that make me cautious.

A few years back, we had a property where the previous owner had installed OSB decking. It looked fine initially, but after a particularly wet winter, we started noticing some soft spots. Turns out, even with decent ventilation, moisture had found its way in through a small leak in the flashing. The OSB swelled up pretty badly, and we ended up replacing a good chunk of it. Now, could plywood have handled that better? Probably. I've seen plywood decking survive similar leaks with minimal damage, so there's definitely something to be said for its resilience.

That said, I agree OSB isn't the nightmare some people make it out to be. If you're meticulous about installation, ventilation, and especially your roofing underlayment, you can get decent longevity out of it. Just don't cut corners on the underlayment - it's your best friend here. And keep an eye out for leaks or moisture buildup, because OSB won't forgive neglect as easily as plywood.

Bottom line: if budget allows, I'd still lean toward plywood for peace of mind. But if OSB is your only realistic option, just be extra careful with installation details and regular inspections.

"Just don't cut corners on the underlayment - it's your best friend here."

Haha, couldn't agree more with this! Underlayment really is the unsung hero in roofing, isn't it? I've dealt with both OSB and plywood decking on various properties, and honestly, both have their pros and cons. But like you said, OSB can be pretty unforgiving if moisture sneaks in.

Have you considered what kind of climate you're working with? If you're somewhere that sees a lot of rain or humidity, plywood might give you that extra bit of breathing room when things inevitably go sideways (because let's face it, leaks happen). I once managed a property where we had plywood decking, and even after a nasty storm tore off some shingles, the plywood underneath held up surprisingly well. It wasn't perfect, but it didn't swell up like OSB tends to do.

On the flip side, I've also seen OSB hold up just fine for years when installed correctly and checked regularly. It comes down to how diligent you're willing to be with maintenance and inspections. Are you someone who'll climb up there every now and then to check things out, or are you more of a "set it and forget it" type? If it's the latter, plywood might save you some headaches down the road.

One thing I haven't seen mentioned much yet - have you looked into radiant barriers or reflective underlayments? They can help manage attic temps and moisture levels. Might be worth considering if you're leaning toward OSB but still feeling a bit uneasy.

Either way, don't stress too much...roofing decisions can be frustrating, but as long as you're careful with installation and keep an eye out for trouble spots, you'll probably be fine. Good luck!

Good luck!

Have you thought about skipping OSB and plywood altogether? A green roof might be worth looking into, especially if moisture is a big concern. I've seen setups where the decking underneath is less critical because the vegetation and drainage layers handle most of the moisture management. Plus, it can help regulate attic temperatures naturally.

That said, I totally get why you're stuck - I've dealt with OSB swelling issues myself after a leak, and it's not fun. Agree with the previous comment too; underlayment really does make or break things when it comes to moisture protection. If you're leaning traditional, plywood probably gives you more peace of mind in wet climates.

Curious though if anyone here has experience combining radiant barriers or reflective underlayments with a green roof... seems like it could be an interesting combo for managing moisture and heat.

"Curious though if anyone here has experience combining radiant barriers or reflective underlayments with a green roof... seems like it could be an interesting combo for managing moisture and heat."

Actually, I helped a friend install a green roof a couple years back, and we did experiment a bit with radiant barriers underneath. Honestly, the difference wasn't huge - it seemed like the vegetation and drainage layers were already doing most of the heavy lifting when it came to temperature control. Moisture-wise, we didn't see any noticeable improvement either way with the reflective stuff.

But yeah, totally agree on ditching OSB if moisture's your main headache. I've seen enough swollen OSB boards to last me a lifetime, lol. Green roofs are great, but make sure your structure can handle the extra weight. If you're worried about load-bearing capacity, plywood decking might still be your safest bet underneath all that greenery.

Have you thought about what plants you'd use yet? Sedums are pretty forgiving, but I've seen some really cool setups with native grasses and wildflowers too...

"Honestly, the difference wasn't huge - it seemed like the vegetation and drainage layers were already doing most of the heavy lifting when it came to temperature control."

Yeah, I think this is spot-on. I've been part of a couple green roof projects myself, and from what I've seen, once you've got a solid vegetation layer established, the radiant barrier doesn't really add much value. The plants and soil already do a pretty impressive job regulating heat and moisture. If anything, I'd put more effort into making sure your drainage and waterproofing layers are top-notch, since that's where I've seen most issues pop up over time.

And totally agree about OSB - it's cheap upfront but can end up costing you way more in headaches down the road. I've had to rip out swollen, moldy OSB decking before, and trust me, it's not something you wanna deal with twice. Plywood might cost a bit more initially, but it's definitely worth it for peace of mind.

As far as plants go, sedums are definitely the easiest route - super hardy and low-maintenance. But if you're feeling adventurous, native grasses or wildflowers can look amazing and even attract pollinators. Just keep in mind they'll probably need a bit more attention at first to get established. A friend of mine did a mix of native grasses and sedums, and it turned out pretty awesome. Took a bit of experimenting to get the balance right, but now it's thriving and looks great year-round.

Anyway, sounds like you're on the right track. Green roofs can be a bit of a hassle to plan out, but they're totally worth it once they're up and running. Keep us updated on how it goes...

Yeah, good call on the OSB - I’ve seen way too many decks ruined by moisture issues. Curious though, did your friend have any trouble with weeds popping up in the native grass mix? Seems like that could get tricky...

Weeds weren't too bad actually, at least from what I've seen. My neighbor did a native grass mix a couple years back - he was worried about weeds too - but after the first growing season things filled in pretty nicely. He did spend some weekends early on hand-pulling a few stubborn ones, but nothing crazy. Honestly, the bigger headache was keeping the birds away from the seed long enough for it to establish.

I've been thinking about doing something similar myself, but I'm still on the fence. It looks great once it's established, but that initial maintenance isn't exactly my idea of fun. Plus, knowing my luck, I'd probably end up with nothing but crabgrass and dandelions...

Yeah, I hear ya about the weeds. My sister did a wildflower mix last spring, and she had a similar experience - mostly just minor hand-pulling at first. Honestly, I'd be more worried about the birds too...those little guys treat seed like it's an all-you-can-eat buffet.

- Totally get your frustration - roof decking choices overwhelmed me too.
- Spent weeks comparing plywood vs OSB, pros and cons lists everywhere...
- Birds definitely complicated my landscaping attempts last year, seeds vanished overnight.
- Hang in there, once you narrow down the decking options, the rest gets easier.

"Hang in there, once you narrow down the decking options, the rest gets easier."

Not sure I'd agree completely with this. Picking between plywood and OSB is just step one - installation methods and moisture barriers can be equally tricky. Personally, I've found OSB fine if properly sealed, but plywood tends to handle unexpected leaks better long-term. Also, birds stealing seeds? Try squirrels...they're like tiny ninjas sabotaging every landscaping effort I've made.

Good points about OSB vs plywood, but have you considered regional climate differences? In my area, humidity swings are pretty intense, and I've noticed OSB tends to swell more noticeably over time - even with sealing. Plywood seems more forgiving in that regard. Also, squirrels are bad enough, but raccoons...they're like furry demolition crews. Had one tear up flashing once just to get into the attic. Ever dealt with those?

Have you tried adding extra venting or moisture barriers to help with the swelling? As for raccoons, yeah, they're relentless... metal mesh screening around vulnerable spots saved me from another attic invasion. Ever given that a shot?

"metal mesh screening around vulnerable spots saved me from another attic invasion."

Yeah, mesh screening is solid advice - just make sure it's galvanized or stainless steel, otherwise rust becomes your next headache. Also, proper venting helps, but moisture barriers can trap humidity if not installed right... seen that happen a few times.

Had a tenant once who insisted on installing mesh screening himself - used some cheap stuff from the hardware store. Sure enough, rusted out in less than two years and squirrels moved right back in. Lesson learned: quality matters, shortcuts rarely pay off...

"quality matters, shortcuts rarely pay off..."

Couldn't agree more with this. Seen it happen too many times - folks trying to save a few bucks upfront, only to spend triple later fixing the mess. Reminds me of a homeowner who insisted on using OSB decking because it was cheaper than plywood. Sure, OSB can hold up under ideal conditions, but once moisture gets in (and trust me, eventually it always does), it swells and deteriorates fast. Ended up tearing off half the roof decking after just three years because of leaks and mold.

Bottom line is, roofing isn't where you want to pinch pennies. Quality materials upfront save headaches, time, and money down the road. Better to invest in something solid from the start than deal with costly repairs later...

Yeah, I get your point about OSB, but honestly, plywood isn't always the magic bullet either. When we redid our roof a few years back, budget was tight, and we went with OSB after hearing mixed reviews. We made sure to get decent quality stuff and had proper ventilation installed, figuring that'd help keep moisture at bay.

Fast forward about five years now - no issues yet (knock on wood). I think a lot of it comes down to installation and ventilation, not just the material itself. I've seen plywood roofs fail too when the attic wasn't properly vented. Moisture buildup can wreck any material if it's trapped up there long enough.

Don't get me wrong, I'm all for quality, but sometimes it's less about choosing the priciest stuff and more about doing the installation right. If you can afford plywood comfortably, sure, go for it. But if you're tight on cash, I wouldn't completely rule out OSB - just make sure whoever installs it knows what they're doing and doesn't cut corners on ventilation or moisture barriers.

Good points about ventilation - seen plenty of plywood decks rot out because someone skipped proper attic airflow. OSB can hold up fine if installed right, but curious if anyone's noticed differences after storm damage? Heard OSB swells more noticeably when wet...any experiences there?

I've definitely seen OSB swell up more than plywood after heavy rains - had a neighbor whose roof tarp blew off mid-storm, and the OSB underneath puffed up pretty noticeably. Still, with proper installation and good shingles, it's usually solid enough for most situations...just don't skimp on ventilation!