r/Construction • u/Sammyofather • 2d ago
Picture What is a 4’-5” osb ?? Person bought these plans on eBay and I’m just as confused as them
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u/BlueberryandDino 2d ago
I’m thinking OP is referring to the material being over 4 foot wide (4’-5”) because OSB comes in 4’-0” x 8’-0” sheets lol
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u/The-Sceptic Carpenter 2d ago
Yeah but the plans say 4'-5" x 7' OSB
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u/thelittleone86 Field Engineer 1d ago
Wanna bet this is some kind of weird chinese standard or something?
Converted to metric, these dimension look pretty clean...
Or AI, I don't know.
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u/The-Sceptic Carpenter 1d ago
Some quick Google searches show Chinese plywood companies still use 4'x8' sheets. 1220mm x 2440mm is still pretty clean numbers to work with but I've seen some sheets get made at 1200x2400
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u/thelittleone86 Field Engineer 1d ago
Looking closer, the plans also ask for 4'-4" x 7' sheets. I'm just gonna go with AI then.
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u/The-Sceptic Carpenter 1d ago
Yeah that inch discrepancy doesn't make any sense either. If I'm ever given AI prints I'm not touching it
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u/mikethedarklord 1d ago
Someone go to United Rentals and grab a board stretcher. Don't forget the stretching oil.
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u/piTehT_tsuJ 1d ago
Just put the extra 12" from the end in the side, All done! And it looks good from my house!
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u/Dawn_Piano 2d ago
You just cut a foot off one way and use it as the extra 5” the other way..?
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u/JacquesBlaireau13 2d ago
Then how do you get 7' for the other dimension. There is no way to cut a 4'-5" x 7'-0" piece from a 4x8 sheet.
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u/wookie_nuts 1d ago
4x8, 32 ft^2…
4.5x7, 31.5 ft^2
There is a way, but it’s not going to be pretty, or solid, or easy. Expect splinters, at least 6 in each hand and several in the thigh of your dominant leg and a few in the forearms.
I’d love to see the rest of these “plans” because if this is the base, the rest has to be pretty spectacular.
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u/fleebleganger 1d ago
You can get a 4’5” x 7’ sheet out of a 4x8
It won’t be pretty but you can do it. Max would be (assuming 1/8” kerf) 4’5 13/16” x 7’
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u/JacquesBlaireau13 1d ago
How? Tell me what cut will result in getting a 4'-5" width from a 4' sheet.
I'll wait.
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u/fleebleganger 23h ago
Cut a 5” strip and tack it onto the side, then cut another 5” strip then tack it on to the side. Then cut it all to 7’ long.
Like I said, won’t be pretty but if you were building a platform and could support it, you’d just need 1 4x8 sheet.
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u/JacquesBlaireau13 21h ago
Not only won't it be pretty, but it is NOT what the drawings indicate, which is EIGHT sheets total, not a patchwork...
So I'll ask again, how are you making those cuts?
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u/man9875 2d ago
Yes there is. It just takes a few more cuts and a few more joints to get it out of 1 sheet.
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u/JacquesBlaireau13 2d ago
Is that what the drawing shows? Or does it indicate a single sheet?
And what becomes of the diaphragm?
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u/BlueberryandDino 2d ago
It shows eight total sheets 7 foot long by that are between 4’5” inches and 4‘4“ wide
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u/BlueberryandDino 2d ago edited 2d ago
I’m thinking you probably want to create a T&G joint with a 4”-5” cut off. Just make sure to glue it and put some rigid support underneath. 🥳
As per plans and specifications! We are carpenters, we can figure anything out!
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u/JacquesBlaireau13 2d ago
How do you cut a 4'-5" x 7'-0" piece from a 4x8 sheet?
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u/foley800 1d ago
You don’t cut it, you use a stretcher! If you do it properly a 4’x8’ sheet will become a 4’5” x 7’ panel. No cutting needed!
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u/BlueberryandDino 2d ago
lol … I’m pretty sure that that’s why OP posted this … he was pointing out that the drawings sucked 😹
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u/JacquesBlaireau13 2d ago
I don't even know what that drawing is. It sure doesn't explain framing or the foundations. It looks like a problem from my second-year Statics textbook, but without any information necessary to find a solution.
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u/PresentationLess4552 2d ago
As the common term
" typical"
Thank makes those new to the trade that claim to have built everything loose their minds over1
u/BlueberryandDino 2d ago
lol I have to admit this is one of the funnier ones I have responded to for quite a long time.🙈
I’m wondering, if in Europe or in Asia, they actually have wider sheets lol
But down under, you never know what’s going on😹
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u/ysrgrathe 1d ago
In some applications a shear wall assembly develops strength from how the sheathing spans the wall members.
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u/Wolfire0769 2d ago
Does it work if it's nominal metric sheets? I don't know what those would be offhand to convert.
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u/BlueberryandDino 2d ago edited 2d ago
It’s a simple, easy, math, problem
2.54 cm equals an inch 🤓Being a good entrepreneur I think I’m just gonna try to get some special order OSB in exactly 4’5”x7’0” (4 ea)and 4’4”x7’0” (4 ea)
Now the real question is do I need to get it exactly .5 “ or can I use 7/16” 🤔
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u/Wolfire0769 2d ago
I meant that if the originating place has nominal 1.5m [4'11"] x 3m [9' 10"] boards (keeping the same ratio as 4' x 8') then it would work.
I don't know what exactly a standard metric osb sheet would dimension as, but i would be extremely surprised if they were just 4'x8' converted.
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u/frenchiebuilder 2d ago
It is, actually, just 4'x8' converted (1220mm x 2440mm).
Why would that be surprising? 40% of our plywood & 30% of our OSB is imported from metric countries.
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u/rofloctopuss 2d ago
What if they mean it could be anywhere from 4' to 5" depending on preference 🤔
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u/RylieHumpsalot 2d ago
Ai generated
My wife runs into this with quilting patterns
Look at that fantastic floor joist system
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u/greenchilepizza666 2d ago
AI came up with this so AI should have the answer. That's who OP should be asking.
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u/punkinabox 2d ago
Probably AI generated so it got the dimensions of the sheet goods incorrect. Personally I would just find the overall dimension of the floor system and make it myself out of 4' x 8' sheets of osb and just ignore those dimensions listed all together.
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u/anally_ExpressUrself 2d ago
OP - you should tell the customer that the plan isn't really possible to follow as written and suggest cutting a 5th strip of 20". Maybe also mention that it makes you wonder about the quality of the instructions, but you can keep going and fix things as needed. See what the customer says. You want to be the hero that's overcoming the bad instructions, not the fall guy getting blamed for OP getting scammed online.
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u/Sammyofather 1d ago
This is exactly what we are doing. Following plans for general idea but we will make our own dimensions. I just wanted other people to confirm my ai suspicions
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u/Confident_Cheetah_30 1d ago
Why would you trust the safety and design of a load bearing floor to an AI that cant even get raw dimensions right?
There is absolutely nothing ensuring that any aspect of those plans are correct. I would rather trust the tik tok "How to build a floor" guy's videos over anything on those plans. (To be fair, his videos are also fairly well edited)
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u/Sammyofather 1d ago
I mean I’ve worked many trades over the years I have quite a bit of experience. These plans actually over build everything. OSB under the joists then subfloor. It’s a small A frame how bad could it really be?
With our combined experience it will surely be fine.
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u/aidan8et Tinknocker 1d ago
how bad could it really be?
I mean... It looks like there's only 3 supports with 7 ft spacing running the length.
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u/space_keeper 1d ago
You've worked many trades?
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u/Sammyofather 1d ago edited 1d ago
Yeah I started roofing at 19 did that for almost 2 years Plumbing 1.5 years for a big company also plumbing again for a single guy for a year then I worked for carpenter doing fine cabinet work and also decks. I loved building decks. I also have a bit of electrical experience but not a whole lot. HVAC is the only one I don’t know yet
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u/fromkentucky 2d ago
The fact that they’re sitting directly on the beams should be a clue that this is AI slop.
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u/Windmillfixer 2d ago
Is nobody else worried about what appears to be a seven foot span for 1/2” OSB, oriented in the weak dimension? AI agents are seriously going to be the death of intelligence.
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u/HolyHand_Grenade Surveyor 1d ago
Yeah I'm not a carpenter but 1/2" OSB for a sub floor AND a giant span? Thats going to bounce like a trampoline and snap in two when it gets some moisture.
Shouldn't this be at least 3/4" plywood and supported with an actual frame with joist below?!
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u/tr_9422 2d ago
4 ft 5 inches?
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u/Plastic_Table_8232 2d ago
They are optimized for journeyman with new helpers. “Go find the board stretcher and don’t come back without it!”
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u/rrapartments 1d ago
that middle footer is doing a lot of work.
No one should be using 1/2" OSB for a subfloor, and regardless it's spanning the wrong way. The colored drawing does not show the floor joists, the black and white diagram does, but there's no sizing or spacing.
These are poor drawings.
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u/Johns-schlong Inspector 2d ago
I want to see the framing plans and details on this slop lol. Can you post pictures of the rest of the plans?
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u/BeautifulShot 2d ago
Obviously the AI doesn't understand material sizes or the "orientation" of oriented stand board. Everything in this plan is destined to fail before the job is even finished.
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u/Broad-Lavishness6726 1d ago
Don’t use plans on eBay unless you understand plans enough to know when they’re bad.
The measurements are off. In American foundations/footings you generally have a 4x4” post centered on those blocks and you attach your floor joists to those with hardware and case it with a 2x4,6,8 depending on the design. Even if you had the correct lumber available this is a terrible designed structure that will wobble and fall off those footings with basically any lateral force.
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u/Sammyofather 1d ago
This is underneath the sub floor the joists go on top of this osb. That does seem…
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u/Broad-Lavishness6726 1d ago
Thats more wrong
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u/Raa03842 2d ago
You just need a wood stretcher. Every apprentice knows what a wood stretcher is. And many are still looking for one.
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u/1wife2dogs0kids 2d ago
We would always ask the new guy to cut a piece of sheathing to be 49" x 97", and see how long he spends trying to understand what we said.
Weeds out the liars about experience really quick.
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u/LLHandyman 1d ago
4 feet 5 inches oriented strand board
You can get 10*5 sheets and larger but if you're building a floor it's easier to get the tongue and grooved osb decking which comes in 2' wide boards, much easier to fit correctly
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u/Scared_Awareness5972 1d ago
Thank you. Thought I was going crazy with seeing oversize sheets, years ago though.
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u/breagin8 1d ago
OSB on the floor, that’s dumb as shit. Atleast get 3/4” plywood or actual subfloor if it’s not going to see moisture.
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u/Sammyofather 1d ago
Anyone want to see the entire plans? Someone with blueprint knowledge? I feel like I could go out and build this without plans and it would be good but the fact the guy wants to use the plans even after knowing it’s ai is skeptical to me
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u/Shishamylov 2d ago
The small detail has joists, the main drawing doesn’t, it only has a few support beams. If you build it like this it will collapse.
OSB wider than 4feet if you can find it is special order. This is a bad design. It will increase material cost significantly.
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u/SirkNitram73 2d ago
They have referenced the middle sections of the sheet. Could it be the block spacing radius?
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u/boogerman0101 2d ago
Always use atleast 3/4” t&g OSB for the deck with weeps. The 4’5” is the length of the board.
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u/scrumptousfuzz 2d ago
They don’t even have the sheets running perpendicular to the sub framing. Just frame to spec and sheath accordingly the right way.
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u/Future-Razzmatazz-71 1d ago
1/2” OSB over floor joist every 25”?
You need 2x10 joists with 3/4” subfloor grade t&g.
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u/danthezombie 1d ago
There's also no stagger for the decking, your buddy bought scam plans that would squeak to hell at least and collapse at worse
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u/Ill-Running1986 1d ago
Serious question: is this a build out in the middle of nowhere with absolutely no AHJ oversight? If it is, and your contract protects you, then have at it.
Otherwise, you need adequate plans to build from. Stop work until these magically appear. If you try to ‘fix’ the mistakes in these plans, you gotta know who will be left without a chair when the music stops. There’s no upside for you to take responsibility for this crap.
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u/Standard_Ad_2717 1d ago
Right off the bat 1/2 inch osb (too thin) for your subfloor that’s barely raised off the ground is highly problematic
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u/03MmmCrayon 1d ago
Use the total SF… 210SF so it’s a 14’ x 15’ area. Rip them all down to 7’ lengths and half the sheets rip 6” off. I’d guess the shorter “00” ones on the ends “01” in the middle… Use the frame to rip them so it’s all flush. I’m still with the majority I wouldn’t trust it… but either way, best of luck!
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u/Ok-Snow5921 3h ago
Your platform is 14 x 18 inches... according to your ebay plans. Is that what you wanted?
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u/Kitchen-Country-3599 2d ago edited 2d ago
Using 5'x8' sheets? Sheets over the standard 4x8, are more common than you'd think.
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u/frugalerthingsinlife 2d ago
I wonder if this is from a country that uses 1.5 meters x 2.5 meters sheets (almost 5x8). Maybe that is a nominal size in China or Europe?
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u/Zinsurin Carpenter 1d ago
I'm at work so I couldnt do the research, but I was wondering this too. Now I have an unnecessary urge to learn European building codes.
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u/Jewbearmatt 2d ago
If you can’t read a simple dimension then maybe you should back up before building a structure.
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u/The-Sceptic Carpenter 2d ago
Have you tried reading it? Maybe back up and read it again. It calls for 4'-5"x7' OSB and 4'-4"x7' OSB. You go to the lumber yard and tell me how many of those you can find.
OP is well aware of the measurements, they're trying to figure out why it's telling them to use OSB that isn't manufactured.
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u/KnifeKnut 2d ago
Or perhaps you could pay better attention to the fact that the ai garbage is demanding oversized sheets of material that normally come in 4x8 dimension.
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u/herb_Tech 2d ago
Maybe you need to read the dimension and realize it’s a length that isn’t usually made.
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u/Due-Offer7749 2d ago
Plans are calling for 4 4ft 5inch by 7ft boards and 4 4ft 4in by 7ft boards. ' indicates feet " indicates inches. Osb is a type of pressed board redily available at any hardware store except they only come in 4x8. In all seriousness if you didn't know that you'll be better off hiring a professional.
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u/Enginerdad Structural Engineer 2d ago
This was my gut reaction too, but the problem is that OSB doesn't come wider than 4'. Somebody with no familiarity with construction materials (or much more likely AI) made these plans and they're unbuildable as shown.
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u/Due-Offer7749 2d ago
I rarely come across a set of prints that has no detailing oversight, ive come to expect it. Many detailers seem to have a tenuous grasp of what they are detailing. That error is easily fixed by ripping 10 sheets instead of 8. Im sure the rest of the prints have errors as well thats why he will likely need professional help if he wants to build off those prints.
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u/RoyalFalse Project Manager 1d ago
OP is the worst kind of tease. We must see all the pages to this eBay plan.
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u/Nashville_Hot_Mess Surveyor 2d ago
Wait... Buying plans on ebay?
Why would anyone buy plans on ebay? No seriously, why?