Figuring out roof support: choosing between rafters and trusses

Rafters definitely give you more open space, but I’ve noticed they can get pricey, and you need to be careful with load calculations if you’re planning on a green roof.

Yeah, I’ve run into that a few times - folks get excited about the open attic with rafters, but once you factor in the extra lumber and labor, it’s not always budget-friendly. Did a job last year where the homeowner wanted a green roof over rafters, but after the engineer’s numbers came in, they had to beef up everything. Cost went up fast. Trusses are a lot simpler for most builds, just not as flexible if you want storage or a loft. Trade-offs everywhere.

Had a customer once who insisted on rafters for the “classic look,” then freaked out when the snow load calc came back. Ended up with more steel than wood up there. Anyone actually had trusses fail in a storm, or is that just urban legend?

Anyone actually had trusses fail in a storm, or is that just urban legend?

I’ve wondered about this too, especially since I’m in a spot that gets a fair bit of snow every winter. When we bought our place, the inspector said trusses are “engineered for the worst case,” but I still get nervous when the wind howls and the drifts pile up. I haven’t heard of any actual truss failures around here, but I do know a neighbor who had rafters sag after a heavy storm - turns out the builder cut corners on the bracing.

I get the appeal of the “classic look,” but honestly, after seeing how much math and steel goes into making rafters safe, I’m leaning toward trusting the truss engineers. Maybe it’s just me being cautious, but I’d rather have something boring and sturdy than risk a roof collapse. Still, I’m curious if anyone’s actually seen trusses fail, or if it’s just one of those things people worry about for no reason.

I haven’t heard of any actual truss failures around here, but I do know a neighbor who had rafters sag after a heavy storm - turns out the builder cut corners on the bracing.

That lines up with what I’ve seen - rafter issues from bad installs, but truss failures are super rare unless someone messed with them or the original design was way off. I’ve inspected a few storm-damaged roofs and, honestly, the trusses usually hold up unless there’s rot or someone removed a web for an attic conversion. It’s not impossible, but it’s definitely not common if everything’s built to code.

- Seen a truss snap only once, and that was after someone decided to carve out a chunk for extra storage - bad idea.
- Most of the time, it’s rafters sagging or twisting after storms, especially if shortcuts were taken on bracing.
- Trusses are like the quiet kid in class - don’t mess with them and they’ll never cause trouble.
- But yeah, rot is the silent killer... found one where squirrels had chewed through and water got in. That was a mess.

Trusses really are the “set it and forget it” option - unless someone gets creative with a saw, like you mentioned. I’ve seen way more rafter issues after big storms, especially when folks skimped on collar ties or didn’t bother with hurricane ties. Trusses can take a beating, but once water or critters get in, all bets are off. Had a job last year where a raccoon family basically turned a truss into mulch... wasn’t pretty. If you’re in a storm-prone area, I’d lean truss, but only if you’re not planning to mess with the structure later.

- Trusses are definitely low-maintenance, but I’ve seen a few issues crop up when people cut into them for skylights or attic access - structural integrity takes a hit fast.
- In my experience, rafter roofs need more regular checks, especially after heavy wind or rain. Missing hurricane ties or collar ties can cause real headaches.
- Critters are a wild card. Once squirrels or raccoons get in, repairs get expensive and messy.
- If you’re in a high-storm area and don’t plan to modify the roof, trusses make sense. Just keep an eye out for water leaks or pest entry points - those can sneak up on you.

Trusses are definitely low-maintenance, but I’ve seen a few issues crop up when people cut into them for skylights or attic access - structural integrity takes a hit fast.

That’s exactly what worries me about trusses - once you start modifying for things like solar tubes or green roof access, it feels like you’re just asking for trouble. Has anyone here actually managed to retrofit a living roof onto trusses without major headaches? I keep hearing mixed things. With rafters, at least you can reinforce as needed, but maybe I’m underestimating the hassle. Curious if anyone’s tried adding extra insulation or plant load to either system and how it held up.

I get the concern, but I’ve actually seen a couple of green roofs done on truss systems without total disaster. The trick is getting an engineer involved early - most headaches seem to come from folks just winging it or not beefing up the trusses for the extra weight. With rafters, yeah, you can sister in more lumber, but it’s not always as simple as it sounds, especially if you’re dealing with old framing or weird spans. Insulation-wise, both setups can be a pain if you’re adding a ton of depth, but I’d say trusses aren’t impossible if you plan ahead.

Had a similar situation last year - old trusses, wanted to put up a green roof. Ended up bringing in an engineer, and we reinforced the heck out of the structure. It was a pain (and not cheap), but it’s holding up great now. Wouldn’t have risked it without pro input, honestly. Rafters seemed easier at first, but our spans were weird, so trusses made more sense for us in the end. Insulation was a bear, though - wish I’d planned that part earlier.

Yeah, I hear you on the insulation headache - ran into that myself after a hailstorm a few years back. We had to replace half the roof, and the old trusses just weren’t up to code for the heavier materials we wanted. Engineer came in, same deal: lots of extra bracing, and it wasn’t cheap. But honestly, after seeing what wind can do to underbuilt roofs, I’d rather overdo it than risk a collapse. Rafters can be tempting for smaller jobs, but those odd spans really do make trusses the safer bet sometimes. Just wish I’d thought through the venting better before closing everything up... live and learn.

That venting issue comes up more than folks realize - once everything’s sealed up, it’s a pain to retrofit. I’ve seen a lot of attic moisture problems just because the original design didn’t account for enough airflow, especially after upgrades or repairs. Trusses do make things easier for odd spans and heavier loads, but you’re right, the upfront engineering and bracing can be a shock to the wallet. I’ve inspected a few jobs where someone tried to save money by skimping on bracing, and it never ends well. If you’re in a high-wind area, overbuilding isn’t really overkill - it’s just smart.

I get where you’re coming from about overbuilding in high-wind areas, but I’ve gotta say, sometimes it feels like the pendulum swings a little too far. I’m in a spot that gets its fair share of storms, and when I re-roofed a few years back, the contractor wanted to go all-in on hurricane ties and extra bracing everywhere. The quote was wild. I ended up talking to a couple neighbors who’d been through the same thing, and honestly, most of them had roofs that held up just fine with standard code bracing - even after some nasty wind events.

Not saying you should cut corners (I’ve seen what happens when folks try to save a buck on structure - never pretty), but there’s a point where you’re just throwing money at “what ifs.” Sometimes it’s more about making sure the work is done right, not just piling on more material. I’ve seen trusses installed perfectly but still have issues because the venting was an afterthought or insulation blocked airflow. That’s where the real headaches start - moldy insulation, soggy sheathing, all that fun stuff.

One thing I do like about stick framing (rafters) is you can tweak things as you go, especially if you’re dealing with an older house that’s not exactly square. Trusses are great for speed and big spans, but once they’re in, you’re locked in. Had a buddy who wanted to add a skylight later and it turned into a whole ordeal because of the truss layout.

Anyway, just my two cents. Sometimes “overbuilding” is smart, sometimes it’s just expensive. Making sure everything’s planned out - especially venting and future access - seems to save more headaches than just beefing up every board.

I get the hesitation about overbuilding, especially when the price tag starts climbing. But I’ve seen some pretty wild wind events here in the Midwest, and honestly, code minimums don’t always cut it. My neighbor’s roof met code, but after last spring’s straight-line winds, he was patching up more than a few shingles. Meanwhile, another guy down the block had gone for the extra hurricane ties and barely had a scratch. I’m not saying you have to go overboard, but sometimes that upfront investment pays off in peace of mind (and fewer repairs).

On the truss vs. rafter thing, I get the flexibility argument for rafters, but trusses saved me a ton on labor and materials when I built my garage. I guess it comes down to what you’re willing to risk and how much you want to spend fixing stuff later.

Funny enough, I just inspected a place last week where the homeowner had gone with trusses and hurricane straps, and his roof held up great after that nasty windstorm we had. But a couple blocks over, rafters plus minimal bracing didn’t fare so well - lost a few sections of sheathing. Ever notice if certain roof shapes in your area seem to take more damage, or is it just random?

- Noticed the same thing after storms - trusses plus hurricane straps seem to hold up better around here.
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“rafters plus minimal bracing didn’t fare so well - lost a few sections of sheathing.”

- Totally get what you’re saying - trusses with hurricane straps have saved a lot of headaches after storms in my area too.
- Still, I’ve seen some old rafter roofs hang tough if they’re well-braced and the sheathing’s solid. Not always about new vs old.
- It’s easy to get discouraged after losing shingles or sheathing, but figuring out what didn’t work is the best way to fix it next time.
- You’re definitely on the right track paying attention to the details. That’s usually what separates the roofs that last from the ones that don’t.

I hear you on the details making all the difference. After a bad windstorm last year, I realized my old rafter roof held up better than some newer truss roofs nearby - probably because I’d spent way too much time fussing over hurricane ties and extra bracing. Sometimes it’s not just about the system but how carefully it’s put together. Have you noticed if certain fasteners or sheathing types seem to hold up better in your area? I’m always curious what actually works in real-world storms, not just on paper.

That lines up with what I’ve seen after big storms - older roofs with solid rafter framing and a bunch of extra ties or blocking often come through better than newer truss jobs where the crew rushed things. Around here (coastal Carolina), I’ve noticed ring-shank nails hold sheathing better than staples, especially when the wind really gets under the eaves. Plywood seems to outlast OSB, too, at least when rain gets driven in. It’s wild how those little choices add up when the weather turns nasty.

I get where you’re coming from, but I’ve seen some newer truss systems hold up really well too, especially when they’re properly engineered and installed. The big difference seems to be attention to detail, not just the method. About this:

Plywood seems to outlast OSB, too, at least when rain gets driven in.

I’ve had a few jobs where high-grade OSB did fine, but yeah, once it gets soaked repeatedly, it’s not as forgiving as plywood. Still, for budget builds, people keep choosing OSB. It’s always a trade-off between cost and long-term durability.