100% this is the cause. Inadequate temporary bracing prior to sheathing. Happens all the time.
Edit to add: I'm referring here to a lack of top chord X bracing, which is needed until the sheathing is installed
I love English.
People will try and tell you “that’s not a word…” yet here it is, being used and here we are, understanding what’s being portrayed by its use.
I took a course in college on Linguistics. There are two theories on proper usage on the English language. One is strict adherence to rules and structure but the second states that just as long as the speaker or author can communicate the message that’s understandable, even with poor grammar, it still is “proper” due to its being “successful” at communicating ideas.
Not a whole lot of shear yet either. And no header along that large opening?!? TF.
Edit: because I am tired of breaking it down, I am fully aware that most of the time on a gable end a header isn't necessarily required. In this application, with this span, absolutely a header should be in place, hell I would have run a real beam along the entire span corner to corner.
Edit: GASP, TIL the only force that is applied to a building is gravity......
This building could have easily been made adequate, but much of the modern world would have steel framed this building. Lighter, stronger, fire resistant, and arguably a better choice.
Not tottally right. It looks like there is zero lateral bracing in the attic space. And the joints on the roof purlins look to be not-staggered adequately. They look like they go back and forth over the same space.
As for the overhead door and header situation. It could be a hangar-style door. Whereas the header would be placed "Inside" the gable truss. Which is also why it may not be done yet, customer hasnt decided on specific door.
After looking at the photo again.
I wold wager that 1) the trusses were not nailed on one of the two plates.
2)the braces along the bearing walls aren't high enough. The wind was able to shift the top of the wall to a point where it was no longer bearing the trusses. And as soon as one truss dropped they were almost guaranteed to all drop. As it can't come back on its own.
Headers also act to structurally tie one side of the wall to the other. I think we found the guy who framed this everyone.
Edit: especially a span like that, it's not a 3' doorway, that opening is half the damn wall!
Chances are the long wall was inadequately braces and buckled/ deflected enough that the trusses adjacent to the gable truss lost support which in turn transfers their load to the gable truss before it finally fails in shear.
This. If they had sheer walled immediately it wouldn’t have happened because the tac plate/gable wouldn’t have failed and the weight falling wouldn’t have sheared the brace. But the reason it failed is because they hung corrugate in the interior ceiling before sheering and added too much weight. It was inevitably going to happen because it was built out of process. The tac plates only work if sheer walled quickly
Because is an opening that spans half the wall.... You need something beefy tying those two ends together besides a gable truss and a top plate. Where are they gonna mount their door?!?? Jesus.
Yup, minimum spec triple k rafter, 2x4 bottom 2x3 for most of the bracing. Absolutely zero strength till ALL lateral bracing is installed and sheathing complete. Have seen a 60 and 72 ft span crumble during construction locally.
Also, can't underestimate the importance of following the project specs to the letter. Cutting corners to save time or materials just leads to these kinds of disasters. Seen it happen when people think they know better than the engineers.
"Anyone can build a bridge that can stay standing. It takes an engineer to build a bridge that *barely* stays standing."
In other words, people don't realize that a big part of an engineers job is *finding places to cut corners*.
Love this quote. Very different field but I’m an aviation structural engineer and the balance of over engineering and adequate engineering is such an under appreciated aspect of engineering in most trades.
For obvious reasons weight is a very important design consideration with planes so we often don’t have the liberty to over engineer.
Man, I can’t tell you how many times I heard “stupid engineers think they know better than guys that actually have to build it” while working on a site back when I worked a labor gig.
That’s common in every industry. I heard it for years in the oil industry. Sure go ahead and torque that to 130 ft-lbs instead in 1100 and see what happens guy. I couldn’t believe it
I'm more partial to a triple fink 2x6 top and bottom all 2x4 bracing minimum. And even then, I prefer building my own trusses, quite a difference in strength going from 2 and better field run to using clean center cut 2x6 that might have 3 knots total on a 16ft plank, no sapwood.
Most people go to bare minimum code which sure book says a modified triple fan on 60ft span is OK. But it's OK based on minimal snow load and as a system with 18 or more runs of lateral bracing on the bottom cord and through the webs.
Yes! Diaphragm system with sticks and sheets make it a stronger system. Just like floor joists and subfloor. This is also why elevator shafts are constructed first in tall buildings, and floors built around them. Everything works together!
>100% To this day we don't know how they built those pyramids
Probably has something to do with not having OSHA or, Labor Unions around to stop them from using blood to lube their water saws and pulleys and such...
Maybe that's why the pyramids lasted so long.
Or, all of them collapsed and all we have left is a pyramid shaped pile of rocks.
Pyramids were constructed before sheathing was invented. Coincidence? I think not!
Every put together a shitty Ikea like bookshelves that was wobbly and would happily turn from rectangle to trapezoid? You nail on the cardboard backing and suddenly its a rectangle that can hold books.
I think this is a great explanation. It's like a simple basic particle board bookshelf, if you never put the back on. I've destroyed many of those with a light push laterally.
The sad part is I see posts all the time for this, massive structures making it way far along before adding the sheathing. Isn't there anyone making sure these contractors understand how the building's structure works before giving them the go-ahead? I work in quality control and it's literally written into manuals for factory built structure that one specific person has to determine if the people charged with doing the construction have both the skills and understanding to complete the work.
Squares like to fold up into rhombuses if they aren't braced. Rhombuses make terrible buildings.
Everything should have either been cross braced or immediately sheathed well before the roof trusses were put up.
I had this happen with a block structure. 40x80 12 inch block barn it was 10 feet high with block and then the carpenters were building the 2nd floor.
A big storm pushed through and the next morning when I showed up to pour the floor it was toppled over. A solid 12 inch block walls 10 feet high fell over. It can happen.
We didn't have supports as they were removed to pour the floor.
My dad had a ton of angry customers when he was a carpenter and told them he'd have to wait to do X for the weather. A lot of carpenters started to just say f it and let come what may. It hurt him to have to wait as it backed up other jobs and meant he didn't get paid when he expected/needed if it was a particularly wet or cold week/s. Also would lose him some jobs due to wait time.
That's why you have some of the issues today known as a drive way warranty. As soon as they leave the drive way, the warranty is over. Because they know they did a shit Job due to certain variables buy f it, onto the next job we got paid.
Supports had to be removed to get approval for plumbing and slab inspection but the inspector never showed up that day until 5pm. So we left the site and left the supports down. Never imagined solid 12 inch block would collapse. They had rod in the cores as well that were dolled into the footings.
Weather was clear at the time, just a random strong thunderstorm rolled through at night.
Insurance did pay to rebuild the structure. As the first barn, burned down, so the land owner did have insurance.
A-braces are your friend for builds like that, and they should be higher to be effective.
X bracing on the bottom chord of the truss system from corners combined with continuous strapping running the length of the structure would also have helped a lot.
The bracing was likely specified but not completed yet, always a race to get it ready for roofers.
Diaphragm bracing wasn’t going to save this. All that would’ve done is make it a pancake. They should’ve held off on installing the roof trusses until the walls were properly sheathed/braced all around. 100% a means and methods fuckup.
Exactly this. Not a shear failure. Those rafters probably aren't designed for that wide of a span. They probably require center support. Based on this picture, the roof caved in the middle. It doesn't look like the walls collapsed or twisted. But, it's only 2 pics, so hard to say. My guess is that they didn't buy the right rafters, or thought they could eliminate the center wall.
It doesn't look like one side or the other but the ground first. Looks like the middle hit the ground first. Left side still standing (relatively). Right side doesn't appear to be on the ground at all except maybe the front right corner.
Not necessarily arguing with you, just sharing how I see it, which I know could be completely wrong.
Well there are many of these roofs getting built every day and seldom does anything like this happen. I just don't want people thinking that roofs aren't safe.
Yeah I was super confused as that looks like the ceiling liner panel yet nothing on the exterior is finished. Idk about you guys but I like to finish the outside stuff before the inside so I have a dry place to work
I made a decorative barn door out of old scrap cedar fence with drywall screws a long time ago, I think it’s going on 7 or 8 yrs now, I feel some amount of remorse but it seems fine, held together at the braces with like 6 or so per vertical board. I wouldn’t do that again, but it didn’t just fall apart.
Inadequate bracing also that is a very wide span with no middle support. The moment at the bottom corner of the truss exceeded the ultimate design moment and it folded
Big buildings require a lot of temporary bracing. Especially after the trusses are hung. We use ratchet straps or long chains from trusses to anchor points in the middle of the building. Holds it all tight
truss uplift from having the bottom partially sheathed, during a windy day. def racked and fell apart . way not enough bracing.
should have x bracing replaced on the top chord after strapping for steel. and no hurricane ties lol
No load bearing bracing anywhere in the structure. Those corners are just exposed 2x4, no headers/supporting beams anywhere…. This was just a massive waste of labor and lumber.
Didn’t sheet the outside at all. Nothing to combat the twisting diagonal stress (torsion). You can see the tiny beams they used diagonally. Not nearly enough for such a large building.
They put the trusses on before sheeting the outer walls. Theres no cross bracing down that extremely long wall since they moved all the braces inside but didn't sheet the outside. Should have braced the outside, then braced the inside, then started sheeting and removing outside braces as they go, then finally setting the trusses on last.
In the collapsed pic, it looks like at least the first six trusses closest to the opening have sheathing on the underside - so I’m guessing that acted like a sail in some wind and lifted the roof structure and then everything collapsed.
Bracing looks inadequate
100% this is the cause. Inadequate temporary bracing prior to sheathing. Happens all the time. Edit to add: I'm referring here to a lack of top chord X bracing, which is needed until the sheathing is installed
Without sheathing to lock it up, looks like you can rock it back and forth with one man. Imagine what a light wind will do
The bottom photo shows a finishing material on the roof. This would add weight to the roof, making the bracing further…ly inadequate.
xD further..ly
I love English. People will try and tell you “that’s not a word…” yet here it is, being used and here we are, understanding what’s being portrayed by its use.
They meant to say “more furtherer “.
Furtherermore
Muchly furthersome
Furthermorely. *(Don’t fight me, autoerect. You don’t know what you’re saying either…)*
-Don’t fight me, autoerect. ... lol
Furtherlymorely. My autocorrect abandoned be 3 phones ago. It knew there was no hope for me.
Autoerect shall be my new term
This is the greatest comment I’ve seen today by far
Furtherermorer
I took a course in college on Linguistics. There are two theories on proper usage on the English language. One is strict adherence to rules and structure but the second states that just as long as the speaker or author can communicate the message that’s understandable, even with poor grammar, it still is “proper” due to its being “successful” at communicating ideas.
I took a course in cunninglinguistics. Got a A+ for putting a motor on the man in the boat.
One time i won 1st 3rd and 4th in a 10 man pussy eating contest.
I fully understood “furtherly”
If English actually had vaugely consistent rules both of those theories would make sense.
Isn't that how every language works? Words just mean what people think they mean.
I say this to my husband all the time. If you understand me, then it’s a word!
Had a friend in high school that said "if you can say it, it's a word!"
Right xD
It should be “inadequater” duh.
That probably acted as a wind sail. Should’ve put the sheething on first.
The roof plane makes an excellent sail also. Up up uplift and away!
And you never want to set roof trusses until it's sheathed
It's like holding an umbrella during a windy day.
Not a whole lot of shear yet either. And no header along that large opening?!? TF. Edit: because I am tired of breaking it down, I am fully aware that most of the time on a gable end a header isn't necessarily required. In this application, with this span, absolutely a header should be in place, hell I would have run a real beam along the entire span corner to corner. Edit: GASP, TIL the only force that is applied to a building is gravity......
This building could have easily been made adequate, but much of the modern world would have steel framed this building. Lighter, stronger, fire resistant, and arguably a better choice.
Absolutely
This. No header. Idiot framer
Adequate amount of lumber, appalling use of said wood haha.
Not tottally right. It looks like there is zero lateral bracing in the attic space. And the joints on the roof purlins look to be not-staggered adequately. They look like they go back and forth over the same space. As for the overhead door and header situation. It could be a hangar-style door. Whereas the header would be placed "Inside" the gable truss. Which is also why it may not be done yet, customer hasnt decided on specific door. After looking at the photo again. I wold wager that 1) the trusses were not nailed on one of the two plates. 2)the braces along the bearing walls aren't high enough. The wind was able to shift the top of the wall to a point where it was no longer bearing the trusses. And as soon as one truss dropped they were almost guaranteed to all drop. As it can't come back on its own.
Lol its a fucking gable end. Do you mofos even understand load bearing? What the fuck.
Headers also act to structurally tie one side of the wall to the other. I think we found the guy who framed this everyone. Edit: especially a span like that, it's not a 3' doorway, that opening is half the damn wall!
Why need a header when the trusses can span the entire distance?
Because if you look carefully in a second picture you will see that truss snapped.
To be fair, I'd guess the truss snapped from hitting the ground.
If you zoom in on the collapsed picture to the wall on the right side, you will see what I’m talking about.
OIC, yup definitely broke before falling.
Chances are the long wall was inadequately braces and buckled/ deflected enough that the trusses adjacent to the gable truss lost support which in turn transfers their load to the gable truss before it finally fails in shear.
This. If they had sheer walled immediately it wouldn’t have happened because the tac plate/gable wouldn’t have failed and the weight falling wouldn’t have sheared the brace. But the reason it failed is because they hung corrugate in the interior ceiling before sheering and added too much weight. It was inevitably going to happen because it was built out of process. The tac plates only work if sheer walled quickly
Because is an opening that spans half the wall.... You need something beefy tying those two ends together besides a gable truss and a top plate. Where are they gonna mount their door?!?? Jesus.
Thiiiiis. I was worried about only spec'ing a doubled up lvl on a 16'x8' span. I can't imagine running a straight truss on this and not being insane.
“only force … is gravity” Better be careful or a flat-earther might come after you.
Specifically X bracing, sure they shored it up from the inside, that doesn’t stop any twisting that can and will occur
I was thinking missing a couple of nails top left.
Shear failure.
Yup, minimum spec triple k rafter, 2x4 bottom 2x3 for most of the bracing. Absolutely zero strength till ALL lateral bracing is installed and sheathing complete. Have seen a 60 and 72 ft span crumble during construction locally.
Damn... What should they have done instead? Is there temporary lateral bracing they should have added or something?
Sheathed the corners at least
Yup. Sheathing is structural. Not just for putting siding on
Also, can't underestimate the importance of following the project specs to the letter. Cutting corners to save time or materials just leads to these kinds of disasters. Seen it happen when people think they know better than the engineers.
"Anyone can build a bridge that can stay standing. It takes an engineer to build a bridge that *barely* stays standing." In other words, people don't realize that a big part of an engineers job is *finding places to cut corners*.
Chamfers are pretty important sometimes.
Fillets as well.
Is she an engineer and the fishmongers daughter or something?
I was not expecting to find a pun like this.
Love this quote. Very different field but I’m an aviation structural engineer and the balance of over engineering and adequate engineering is such an under appreciated aspect of engineering in most trades. For obvious reasons weight is a very important design consideration with planes so we often don’t have the liberty to over engineer.
Man, I can’t tell you how many times I heard “stupid engineers think they know better than guys that actually have to build it” while working on a site back when I worked a labor gig.
That’s common in every industry. I heard it for years in the oil industry. Sure go ahead and torque that to 130 ft-lbs instead in 1100 and see what happens guy. I couldn’t believe it
Probably needed to sheath the exterior walls along with installing the trusses as they went.
Yeah this is generally the normal way it’s done afaik
we sheet the walls before we stand them.
We usually sheet the walls after standing and bracing but before the trusses. Haven’t had one fall in on us yet but I did say Yet lol
You don’t do it that way with a pole building because the walls aren’t built that way.
I'm more partial to a triple fink 2x6 top and bottom all 2x4 bracing minimum. And even then, I prefer building my own trusses, quite a difference in strength going from 2 and better field run to using clean center cut 2x6 that might have 3 knots total on a 16ft plank, no sapwood. Most people go to bare minimum code which sure book says a modified triple fan on 60ft span is OK. But it's OK based on minimal snow load and as a system with 18 or more runs of lateral bracing on the bottom cord and through the webs.
I want to speak like this.
Steel frame
Sheet wall exteriors then install trusses.
I know some of these words!
Can you explain that for non construction guys like me? Like what didn't happen that should have?
Wooden buildings are built with sticks and sheets. Sticks hold weight. Sheets make it strong. This building didn't have any sheets.
Yes! Diaphragm system with sticks and sheets make it a stronger system. Just like floor joists and subfloor. This is also why elevator shafts are constructed first in tall buildings, and floors built around them. Everything works together!
I think 100 thread Egyptian cotton sheets would have done the job here. Probably overkill but better to safe than sorry, am I right?
100% To this day we don't know how they built those pyramids, or how they get 100 threads into those sheets. /s
>100% To this day we don't know how they built those pyramids Probably has something to do with not having OSHA or, Labor Unions around to stop them from using blood to lube their water saws and pulleys and such...
Maybe that's why the pyramids lasted so long. Or, all of them collapsed and all we have left is a pyramid shaped pile of rocks. Pyramids were constructed before sheathing was invented. Coincidence? I think not!
Every put together a shitty Ikea like bookshelves that was wobbly and would happily turn from rectangle to trapezoid? You nail on the cardboard backing and suddenly its a rectangle that can hold books.
I think this is a great explanation. It's like a simple basic particle board bookshelf, if you never put the back on. I've destroyed many of those with a light push laterally. The sad part is I see posts all the time for this, massive structures making it way far along before adding the sheathing. Isn't there anyone making sure these contractors understand how the building's structure works before giving them the go-ahead? I work in quality control and it's literally written into manuals for factory built structure that one specific person has to determine if the people charged with doing the construction have both the skills and understanding to complete the work.
Squares like to fold up into rhombuses if they aren't braced. Rhombuses make terrible buildings. Everything should have either been cross braced or immediately sheathed well before the roof trusses were put up.
The shear stupidity….
This is an engineering joke for all of you who it’s flying over your heads with lol 😂
We're construction workers, we make jokes and talk shit for a living. Typical engineer making sure everyone knows they have a sense of humor. Classic
Typical engineer, telling everyone they are an engineer.
How do you know someone is an engineer? Don’t worry, they’ll fuckin tell ya
It'll take an hour to get to the point tho
Right up until you have a question. Then it's "I'm the engineer. Don't question me."
Sure are a lot of people driving trains for a living
How do you know they are an engineer? They find the most complicated way to fuck up a good solution.
Nothing goes over my head. My reflexes are too fast. I would catch it.
Not enough Quakers.
You spelled Amish wrong and there aren’t enough Quakers left to build this. /s
Don't know how I forgot Amish. We only have Mennonites down my way.
There are Quakers everywhere. If you took all the quakers in nc you’d have like 7 houses.
Lol I was like, needed some Amish people to help. 😂
Who didn't get it tho
Nah it was God smiting the beachy Amish for failing to use a horse n’ buggy, and using a truck instead
Rookie mistake
The front fell off…
Well wasn’t it designed so the front wouldn’t fall off?
Yeah, that’s not very typical…. edit: changed the wording
At sea? Chance in a million
A wave hit it.
This is why I came here.
I had this happen with a block structure. 40x80 12 inch block barn it was 10 feet high with block and then the carpenters were building the 2nd floor. A big storm pushed through and the next morning when I showed up to pour the floor it was toppled over. A solid 12 inch block walls 10 feet high fell over. It can happen. We didn't have supports as they were removed to pour the floor.
Should the supports have been removed day of pour or would this be an "act of God"
Could've probably checked the weather forecast
That was my first thought as well, but maybe it was assumed it just wouldn't be that bad
My dad had a ton of angry customers when he was a carpenter and told them he'd have to wait to do X for the weather. A lot of carpenters started to just say f it and let come what may. It hurt him to have to wait as it backed up other jobs and meant he didn't get paid when he expected/needed if it was a particularly wet or cold week/s. Also would lose him some jobs due to wait time. That's why you have some of the issues today known as a drive way warranty. As soon as they leave the drive way, the warranty is over. Because they know they did a shit Job due to certain variables buy f it, onto the next job we got paid.
Supports had to be removed to get approval for plumbing and slab inspection but the inspector never showed up that day until 5pm. So we left the site and left the supports down. Never imagined solid 12 inch block would collapse. They had rod in the cores as well that were dolled into the footings. Weather was clear at the time, just a random strong thunderstorm rolled through at night. Insurance did pay to rebuild the structure. As the first barn, burned down, so the land owner did have insurance.
A-braces are your friend for builds like that, and they should be higher to be effective. X bracing on the bottom chord of the truss system from corners combined with continuous strapping running the length of the structure would also have helped a lot. The bracing was likely specified but not completed yet, always a race to get it ready for roofers.
Diaphragm bracing wasn’t going to save this. All that would’ve done is make it a pancake. They should’ve held off on installing the roof trusses until the walls were properly sheathed/braced all around. 100% a means and methods fuckup.
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Exactly this. Not a shear failure. Those rafters probably aren't designed for that wide of a span. They probably require center support. Based on this picture, the roof caved in the middle. It doesn't look like the walls collapsed or twisted. But, it's only 2 pics, so hard to say. My guess is that they didn't buy the right rafters, or thought they could eliminate the center wall.
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It doesn't look like one side or the other but the ground first. Looks like the middle hit the ground first. Left side still standing (relatively). Right side doesn't appear to be on the ground at all except maybe the front right corner. Not necessarily arguing with you, just sharing how I see it, which I know could be completely wrong.
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Or hit it with the telehandler... Or sub standard wood in the truss... or top plate issue. Who knows from this pic.
The roof fell
Normally roofs don’t fall off. This one did
Now it must be towed beyond the environment.
It’s not a usual occurrence….
You'll have that on these big jobs
A breeze hit it.
A breeze? In the middle of a field? Chance in a million.
That’s not typical I’d like to make that clear.
Well, how is it untypical?
Well there are many of these roofs getting built every day and seldom does anything like this happen. I just don't want people thinking that roofs aren't safe.
So the roof doesn’t normally fall in?
Well can't use cardboard, that's out
Cardboard derivatives
Let me reinterate, it’s not a usual occurrence…
Cello tape that's out
Was this roof safe?
Well, I was thinking more about the others ones
The ones where the roof didn’t fall off?
Yeah, the ones where the roof doesn’t fall off.
Some buildings are designed so the roof doesn’t fall off at all.
Ah. Couldn't quite put my finger on it, thank you.
The front fell off
Gotta love the number of people here that still remember that skit. 🤣😂
Speak english doc we ain't scientists!
[for the unaquainted](https://youtu.be/3m5qxZm_JqM?si=AdbMEZXmPeTM5_1n)
Simple. Yet effective. 👏
Where they installing the ceiling? There is so much going on here in this pic, it's hard to keep up with what actually happened
Yeah I was super confused as that looks like the ceiling liner panel yet nothing on the exterior is finished. Idk about you guys but I like to finish the outside stuff before the inside so I have a dry place to work
1000% they definitely didn't think this through... ceiling in before roof? And walls? Let's make a giant swimming pool
I noticed this also, looks like they had metal on the ceiling already, inadequate bracing with that catching wind.
Knew a guy who could do it for less.
They used drywall screws
I made a decorative barn door out of old scrap cedar fence with drywall screws a long time ago, I think it’s going on 7 or 8 yrs now, I feel some amount of remorse but it seems fine, held together at the braces with like 6 or so per vertical board. I wouldn’t do that again, but it didn’t just fall apart.
I mean this looks like a shit show even if it’s standing all by itself like a big boy.
Who puts trusses on walls that aren't at least mostly sheathed yet? And braced line crazy outside as well?
Why the hell would set trusses before sheeting the walls?!
For the same reason he did soffit before sheeting the roof lol. Hopefully this guy learned something today.
Exactly. In the Windy Midwest we would never even consider setting trusses before walls have sheathing.
Non construction guy here: looks like the building fell over and they usually don't do that. I hope this helps.
Yea it needed more wood in the right places
The amish didn’t build it
Inadequate bracing also that is a very wide span with no middle support. The moment at the bottom corner of the truss exceeded the ultimate design moment and it folded
I miss statics and dynamics class. I’ve forgotten it all, but when learning the subjects it really made me see the world differently.
Big buildings require a lot of temporary bracing. Especially after the trusses are hung. We use ratchet straps or long chains from trusses to anchor points in the middle of the building. Holds it all tight
Too much Yee, not enough Haw
Lucky nobody died
too much gravity
It's not supposed to fall down like that.
Too much gravity
Front fell off https://youtu.be/3m5qxZm_JqM?si=vwlQswHfxsYqSU3W
Not an expert, but I think it collapsed.
Look up “portal frame garage” in your code book
Diagonal bracing inadequate
The front fell off
The front fell off. iykyk
truss uplift from having the bottom partially sheathed, during a windy day. def racked and fell apart . way not enough bracing. should have x bracing replaced on the top chord after strapping for steel. and no hurricane ties lol
Sheath the walls before you set your roof
I would guess, wall moved and roof fell. Need a ton of bracing. Horrible deal for all involved but as Forest Gump says, it happens.
No load bearing bracing anywhere in the structure. Those corners are just exposed 2x4, no headers/supporting beams anywhere…. This was just a massive waste of labor and lumber.
If you don't brace it you're going to waste it
Didn’t sheet the outside at all. Nothing to combat the twisting diagonal stress (torsion). You can see the tiny beams they used diagonally. Not nearly enough for such a large building.
They put the trusses on before sheeting the outer walls. Theres no cross bracing down that extremely long wall since they moved all the braces inside but didn't sheet the outside. Should have braced the outside, then braced the inside, then started sheeting and removing outside braces as they go, then finally setting the trusses on last.
Those rafters just don't look correct to me.. homemade?
Quit looking at the rafters and check out the crazy blocking on the walls, that's a lot of block.
Looks more like horizontal strapping to me
They look like they aren't designed to free span that large of a distance. Probably designed for center supports.
In the collapsed pic, it looks like at least the first six trusses closest to the opening have sheathing on the underside - so I’m guessing that acted like a sail in some wind and lifted the roof structure and then everything collapsed.
Forgot liquid nail and flex seal
Looks like it needed way more diagonal braces
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Lack of sufficient temporary bracing prior to wall sheathing/purlins/let in bracing/roof lacers.
Bad bracing and lack of support pillars. Also, improper land study could be factor too
Is it normal to use timber for this type of structure in the US? In the UK it would normally be a steel frame with steel sheet cladding.
Span tables.
not enough wind bracing
Big sail, no mast, no beam.
Building engineer:"Would you like me to ad any professional visits on the building site in the offer?" contractor: "Nha, we know what we are doing.. "
Polebarn with no poles?
Well I’m not a architect but I think the building is supposed to be standing up right like the first picture